Icom IC-7800 Instruction Manual

HF/50 MHz transceiver— IC-7800. The IC-7800 is designed and built with Icom’s superior technology and craftsmanship. With proper care, this prod- uct should provide you with years of trouble-free operation. We would like to take a few moments of your time to thank you for making the IC-7800 your radio of choice, and hope you agree with Icom’s philoso- phy of “technology first.” Many hours of research and development went into the design of your IC-7800. D FEATURES ❍Ultimate receiver performance: third-order intercept (IP3) of +40 dBm (HF bands only), both main and sub ❍Independent identical receiver circuits for main and sub bands provide perfect no-compromise Dualwatch operation ❍Built-in Baudot RTTY and PSK31 modulator/demodulator and direct PC keyboard connection capability for RTTY and PSK31 operation without a PC ❍Upgraded real-time spectrum scope— center frequency and fix frequency modes, plus mini-scope displays IMPORTANT READ THIS INSTRUCTION MANUAL CAREFULLY before at- tempting to operate the transceiver. SAVE THIS INSTRUCTION MANUAL. This manual contains im- portant safety and operating instructions for the IC-7800. EXPLICIT DEFINITIONS TRADEMARKS Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. WORD DEFINITION R WARNING Personal injury, fire hazard or electric shock may occur. CAUTION Equipment damage may occur. NOTE If disregarded, inconvenience only. No risk of person- al injury, fire or electric shock.

attach an antenna or internal antenna connector during transmission. This may result in an electrical shock or burn. R WARNING! NEVER operate the transceiver with a headset or other audio accessories at high vol- ume levels. Hearing experts advise against continuous high volume operation. If you experience a ringing in your ears, reduce the volume or discontinue use. R CAUTION! NEVER change the internal set- tings of the transceiver. This may reduce transceiver performance and/or damage to the transceiver. In particular, incorrect settings for transmitter circuits, such as output power, idling current, etc., might dam- age the expensive final devices. The transceiver warranty does not cover any problems caused by unauthorized internal adjustment. R CAUTION! NEVER touch the transceiver top cover when transmitting continuously for long periods. The top cover may be hot. R CAUTION! The transceiver weighs approx. 25 kg (55 lb). Always have two people available to carry, lift or turn over the transceiver. R CAUTION! The line-voltage receptacle must be near the transceiver and must be easily accessible. Avoid extension cords. R ACHTUNG! Die Steckdose muß nabe bei diesem Gerät angebracht und zugänglich sein. R NEVER let metal, wire or other objects protrude into the transceiver or into connectors on the rear panel. This may result in an electric shock. R NEVER block any cooling vents on the top, rear or bottom of the transceiver. R NEVER expose the transceiver to rain, snow or any liquids. R NEVER install the transceiver in a place without adequate ventilation. Heat dissipation may be reduced, and the transceiver may be damaged. R NEVER operate or touch the transceiver with wet hands. This may result in an electric shock or damage to the transceiver. DO NOT use chemical agents such as benzine or al- cohol when cleaning the IC-7800, as they can damage the transceiver’s surfaces. DO NOT push the PTT switch when you don’t actu- ally desire to transmit. AVOID using or storing the transceiver in areas with temperatures below ±0°C (+32°F) or above +50°C (+122°F). AVOID placing the transceiver in excessively dusty en- vironments or in direct sunlight. AVOID placing the transceiver against walls or putting anything on top of the transceiver. This may overheat the transceiver. Always place unit in a secure place to avoid inadver- tent use by children. BE CAREFUL! If you use a linear amplifier, set the transceiver’s RF output power to less than the linear amplifier’s maximum input level, otherwise, the linear amplifier will be damaged. Use Icom microphones only (supplied or optional). Other manufacturers’ microphones have different pin assignments, and connection to the IC-7800 may dam- age the transceiver or microphone. The LCD display may have cosmetic imperfections that appear as small dark or light spots. This is not a mal- function or defect, but a normal characteristic of LCD displays. During maritime mobile operation, keep the transceiver and microphone as far away as possible from the mag- netic navigation compass to prevent erroneous indica- tions. Turn [I/O] switch (on the rear panel) OFF and/or dis- connect the AC power cable from the AC outlet when you will not use the transceiver for long period of time. For U.S.A. only CAUTION: Changes or modifications to this device, not expressly approved by Icom Inc., could void your authority to operate this device under FCC regulations.

………………………………… 1 w Antenna jumper cables …………………………… 2 e Rack mounting handles ……………………… 1 pair r Screws for rack mounting handles ………… 1 set t CF (Compact Flash) memory card ……………… 1 y Stands ………………………………………… 1 pair u Spare fuse (FGB 2 A) …………………………… 1 i RCA plugs ………………………………………… 2 o DC power plug …………………………………… 1 !0 2-conductor 1⁄8″ plugs …………………………… 3 !1 3-conductor 1⁄8″ plugs …………………………… 2 !2 3-conductor 1⁄4″ plugs …………………………… 3 !3 ACC plugs (7-pin) ………………………………… 2 !4 ACC plugs (8-pin) ………………………………… 2 !5 Antenna connector caps ………………………… 4 *May differ from that shown according to version iii SUPPLIED ACCESSORIES Section 1 PANEL DESCRIPTION I Front panel ……………………………………………………………… 1-2 I Rear panel ……………………………………………………………… 1-12 I LCD display …………………………………………………………… 1-14 I Screen menu arrangement …………………………………………… 1-15 Section 2 INSTALLATION AND CONNECTIONS I Unpacking ……………………………………………………………… 2-2 I Antenna jumper cable connection …………………………………… 2-2 I Selecting a location …………………………………………………… 2-2 I Rack mounting handle attachment …………………………………… 2-2 I Grounding ……………………………………………………………… 2-3 I Antenna connection …………………………………………………… 2-3 I CF (Compact Flash) memory card …………………………………… 2-3 I Required connections ………………………………………………… 2-4 D Front panel …………………………………………………………… 2-4 D Rear panel …………………………………………………………… 2-4 I Advanced connections ………………………………………………… 2-5 D Front panel …………………………………………………………… 2-5 D Rear panel—1 ……………………………………………………… 2-5 TABLE OF CONTENTS q !0 !1 !2 !3 !4 !5 y u i o e w r t

……………………………………………………… 2-6 I Linear amplifier connections …………………………………………… 2-7 D Connecting the IC-PW1/EURO …………………………………… 2-7 D Connecting a non-Icom linear amplifier …………………………… 2-7 I Transverter jack information …………………………………………… 2-8 I FSK and AFSK (SSTV) connections ………………………………… 2-8 I Microphone connector information …………………………………… 2-9 I Microphones (options) ………………………………………………… 2-9 D SM-20 ………………………………………………………………… 2-9 D HM-36 ………………………………………………………………… 2-9 I Accessory connector information …………………………………… 2-10 Section 3 BASIC OPERATIONS I When first applying power (CPU resetting) ………………………… 3-2 I Initial settings …………………………………………………………… 3-2 I Main/Sub band selection ……………………………………………… 3-3 I Selecting VFO/memory mode ………………………………………… 3-3 I Selecting an operating band …………………………………………… 3-4 D Using the band stacking registers ………………………………… 3-4 I Frequency setting ……………………………………………………… 3-5 D Tuning with the main dial …………………………………………… 3-5 D Direct frequency entry with the keypad …………………………… 3-5 D Quick tuning step …………………………………………………… 3-6 D Selecting “kHz” step ………………………………………………… 3-6 D 1⁄4 tuning step function ……………………………………………… 3-6 D Selecting 1 Hz step ………………………………………………… 3-7 D Auto tuning step function …………………………………………… 3-7 D Band edge warning beep …………………………………………… 3-7 I Operating mode selection ……………………………………………… 3-8 I Volume setting ………………………………………………………… 3-9 I RF gain adjustment …………………………………………………… 3-9 I Squelch level adjustment ……………………………………………… 3-9 I Meter indication selection …………………………………………… 3-10 D Multi-function digital meter ………………………………………… 3-10 D Meter type selection ……………………………………………… 3-11 I Basic transmit operation ……………………………………………… 3-12 D Transmitting ………………………………………………………… 3-12 D Microphone gain adjustment ……………………………………… 3-12 D Drive gain adjustment ……………………………………………… 3-13 Section 4 RECEIVE AND TRANSMIT I Operating SSB ………………………………………………………… 4-2 D Convenient functions for receive ……………………………………4-2 D Convenient functions for transmit ……………………………………4-3 D About 5 MHz band operation (USA version only) …………………4-3 I Operating CW …………………………………………………………… 4-4 D Convenient functions for receive ……………………………………4-4 D Convenient functions for transmit ……………………………………4-5 D About CW reverse mode ……………………………………………4-5 D About CW pitch control ………………………………………………4-5 D CW side tone function ………………………………………………4-5 D APF (Audio Peak Filter) operation …………………………………4-6 D About 137 kHz band operation (Europe, UK, Italy, Spain, France versions only) …………………………………………………………4-6 I Electronic keyer functions ……………………………………………… 4-7 TABLE OF CONTENTS

D Editing a memory keyer ………………………………………………4-9 D Contest number set mode …………………………………………4-10 D Keyer set mode ………………………………………………………4-11 I Operating RTTY (FSK) ……………………………………………… 4-13 D Convenient functions for receive …………………………………4-14 D About RTTY reverse mode …………………………………………4-14 D Twin peak filter ………………………………………………………4-14 D Functions for the RTTY decoder indication ………………………4-15 D Setting the decoder threshold level ………………………………4-15 D RTTY memory transmission ………………………………………4-16 D Automatic transmission/reception setting …………………………4-16 D Editing RTTY memory ………………………………………………4-17 D RTTY decode set mode ……………………………………………4-18 D Data saving …………………………………………………………4-20 I Operating PSK ………………………………………………………… 4-21 D Convenient functions for receive …………………………………4-22 D About BPSK and QPSK mode ……………………………………4-22 D Functions for the PSK decoder indication ………………………4-23 D Setting the decoder threshold level ………………………………4-23 D PSK memory transmission …………………………………………4-24 D Automatic transmission/reception setting …………………………4-24 D Editing PSK memory ………………………………………………4-25 D PSK decode set mode ………………………………………………4-26 D Data saving …………………………………………………………4-28 I Operating AM ………………………………………………………… 4-29 D Convenient functions for receive …………………………………4-29 D Convenient functions for transmit …………………………………4-30 I Operating FM ………………………………………………………… 4-31 D Convenient functions for receive …………………………………4-31 D Convenient functions for transmit …………………………………4-31 I Repeater operation …………………………………………………… 4-32 D Repeater tone frequency setting …………………………………4-32 I Tone squelch operation ……………………………………………… 4-33 I Data mode (AFSK) operation ………………………………………… 4-34 Section 5 FUNCTIONS FOR RECEIVE I Spectrum scope screen ……………………………………………… 5-2 D Center mode ………………………………………………………… 5-2 D Fix mode ……………………………………………………………… 5-3 D Mini scope screen indication ……………………………………… 5-4 D Scope set mode ……………………………………………………… 5-4 I Preamplifier ……………………………………………………………… 5-9 I Attenuator ……………………………………………………………… 5-9 I RIT function …………………………………………………………… 5-10 D RIT monitor function …………………………………………………5-10 I AGC function …………………………………………………………… 5-11 D Selecting the preset value …………………………………………5-11 D Adjusting the AGC time constant …………………………………5-11 D Setting the AGC time constant preset value ………………………5-11 I Twin PBT operation …………………………………………………… 5-12 I IF filter selection ……………………………………………………… 5-13 D IF filter selection …………………………………………………… 5-13 D Filter passband width setting (except FM mode) ……………… 5-13 D Roofing filter selection ……………………………………………… 5-14 v TABLE OF CONTENTS

D Filter shape set mode ……………………………………………… 5-14 I Dualwatch operation ………………………………………………… 5-16 I Noise blanker ………………………………………………………… 5-17 D NB set mode ………………………………………………………… 5-17 I Noise reduction ………………………………………………………… 5-18 I Dial lock function ……………………………………………………… 5-18 I Notch function ………………………………………………………… 5-19 I Digital selector ………………………………………………………… 5-19 Section 6 FUNCTIONS FOR TRANSMIT I VOX function …………………………………………………………… 6-2 D Using the VOX function …………………………………………… 6-2 D Adjusting the VOX function ………………………………………… 6-2 D VOX set mode ……………………………………………………… 6-2 I Break-in function ………………………………………………………… 6-3 D Semi break-in operation …………………………………………… 6-3 D Full break-in operation ……………………………………………… 6-3 I ∂TX function …………………………………………………………… 6-4 D ∂TX monitor function ………………………………………………… 6-4 I Monitor function ………………………………………………………… 6-4 I Transmit filter width setting (SSB only) ……………………………… 6-5 I Speech compressor (SSB only) ……………………………………… 6-5 I Split frequency operation ……………………………………………… 6-6 I Quick split function ……………………………………………………… 6-7 D Split lock function …………………………………………………… 6-7 Section 7 VOICE RECORDER FUNCTIONS I About digital voice recorder …………………………………………… 7-2 I Recording a received audio …………………………………………… 7-3 D Basic recording ……………………………………………………… 7-3 D One-touch recording ………………………………………………… 7-3 I Playing the recorded audio …………………………………………… 7-4 D Basic playing ………………………………………………………… 7-4 D One-touch playing …………………………………………………… 7-4 I Protect the recorded contents ………………………………………… 7-5 I Erasing the recorded contents ………………………………………… 7-5 I Recording a message for transmit …………………………………… 7-6 D Recording …………………………………………………………… 7-6 D Confirming a message for transmit ………………………………… 7-6 I Programming a memory name ……………………………………… 7-7 I Sending a recorded message ………………………………………… 7-8 D Transmit level setting ……………………………………………… 7-8 I Voice set mode ………………………………………………………… 7-9 I Saving a voice memory into the CF card …………………………… 7-10 D Saving the received audio memory ……………………………… 7-10 D Saving the TX memory …………………………………………… 7-10 Section 8 MEMORY OPERATION I Memory channels ……………………………………………………… 8-2 I Memory channel selection …………………………………………… 8-2 D Using the [Y]/[Z] keys ……………………………………………… 8-2 D Using the keypad …………………………………………………… 8-2 I Memory list screen ……………………………………………………… 8-3 D Selecting a memory channel using the memory list screen …… 8-3 D Confirming programmed memory channels ……………………… 8-3 TABLE OF CONTENTS

……………………………………… 8-4 D Programming in VFO mode ………………………………………… 8-4 D Programming in memory mode …………………………………… 8-4 I Frequency transferring ………………………………………………… 8-5 D Transferring in VFO mode ………………………………………… 8-5 D Transferring in memory mode ……………………………………… 8-5 I Memory names ………………………………………………………… 8-6 D Editing (programming) memory names …………………………… 8-6 I Memory clearing ………………………………………………………… 8-6 I Memo pads ……………………………………………………………… 8-7 D Writing frequencies and operating modes into memo pads …… 8-7 D Calling up a frequency from a memo pad ………………………… 8-7 Section 9 SCANS I Scan types ……………………………………………………………… 9-2 I Preparation ……………………………………………………………… 9-2 I Voice squelch control function ………………………………………… 9-3 I Scan set mode ………………………………………………………… 9-3 I Programmed scan operation ………………………………………… 9-4 I ∂F scan operation ……………………………………………………… 9-4 I Fine programmed scan/∂F scan ……………………………………… 9-5 I Memory scan operation ………………………………………………… 9-6 I Select memory scan operation ……………………………………… 9-6 I Setting select memory channels ……………………………………… 9-7 D Setting in scan screen ……………………………………………… 9-7 D Setting in memory list screen ……………………………………… 9-7 D Erasing the select scan setting …………………………………… 9-7 I Tone scan ……………………………………………………………… 9-8 Section 10 ANTENNA TUNER OPERATION I Antenna connection and selection ………………………………… 10-2 I Antenna memory settings …………………………………………… 10-3 D Antenna type selection …………………………………………… 10-3 D Temporary memory ………………………………………………… 10-4 D Antenna selection mode …………………………………………… 10-4 I Antenna tuner operation ……………………………………………… 10-5 D Tuner operation …………………………………………………… 10-5 D If the tuner cannot tune the antenna …………………………… 10-6 Section 11 CLOCK AND TIMERS I Time set mode ………………………………………………………… 11-2 I Daily timer setting ……………………………………………………… 11-3 I Setting sleep timer …………………………………………………… 11-4 I Timer operation ………………………………………………………… 11-4 Section 12 SET MODE I Set mode description ………………………………………………… 12-2 D Set mode operation ………………………………………………… 12-2 D Screen arrangement ……………………………………………… 12-3 I Level set mode ………………………………………………………… 12-4 I ACC set mode ………………………………………………………… 12-6 I Display set mode …………………………………………………… 12-11 I Miscellaneous (Others) set mode ………………………………… 12-14 I CF card set menu …………………………………………………… 12-22 D CF card set screen arrangement ……………………………… 12-22 D Save option set mode …………………………………………… 12-23 vii TABLE OF CONTENTS

I File saving …………………………………………………………… 12-25 I File loading …………………………………………………………… 12-26 I Changing the file name ……………………………………………… 12-27 I Deleting a file ………………………………………………………… 12-28 I Formatting the CF card ……………………………………………… 12-28 Section 13 MAINTENANCE I Troubleshooting ……………………………………………………… 13-2 D Transceiver power ………………………………………………… 13-2 D Transmit and receive ……………………………………………… 13-2 D Scanning …………………………………………………………… 13-3 D Display ……………………………………………………………… 13-3 I Main dial brake adjustment ………………………………………… 13-3 I Voice synthesizer operation ………………………………………… 13-3 I SWR reading …………………………………………………………… 13-4 I Screen type and font selections …………………………………… 13-4 I Frequency calibration (approximate) ……………………………… 13-5 I Opening the transceiver’s case ……………………………………… 13-6 I Clock backup battery replacement ………………………………… 13-6 I Fuse replacement …………………………………………………… 13-7 I Resetting the CPU …………………………………………………… 13-7 I About protection indications ………………………………………… 13-8 I Screen saver function ………………………………………………… 13-8 Section 14 CONTROL COMMAND I Remote jack (CI-V) information ……………………………………… 14-2 D CI-V connection example ………………………………………… 14-2 D Data format ………………………………………………………… 14-2 D Command table …………………………………………………… 14-9 D To send/read memory contents …………………………………… 14-9 D Band stacking register …………………………………………… 14-9 D Codes for memory keyer contents ……………………………… 14-9 D Codes for memory name, opening message and clock 2 name contents ……………………………………… 14-9 D Offset frequency setting ………………………………………… 14-10 D Repeater tone/tone squelch frequency setting ………………… 14-10 D SSB transmission passband width setting …………………… 14-10 D Color setting ……………………………………………………… 14-10 D Bandscope edge frequency setting …………………………… 14-10 D Data mode with filter width setting ……………………………… 14-10 D Antenna memory setting ………………………………………… 14-10 Section 15 SPECIFICATIONS AND OPTIONS I Specifications ………………………………………………………… 15-2 D General ……………………………………………………………… 15-2 D Transmitter ………………………………………………………… 15-2 D Receiver …………………………………………………………… 15-3 D Antenna tuner ……………………………………………………… 15-3 I Options ………………………………………………………………… 15-4 TABLE OF CONTENTS

I General ………………………………………………………………… 16-2 I Caution ………………………………………………………………… 16-2 I Preparation …………………………………………………………… 16-3 D Firmware and firm utility …………………………………………… 16-3 D File downloading …………………………………………………… 16-3 I Firmware update— CF memory card ……………………………… 16-4 I Firmware update— PC ……………………………………………… 16-6 D Connections ………………………………………………………… 16-6 D IP address setting ………………………………………………… 16-7 D Updating from the PC ……………………………………………… 16-8 ix TABLE OF CONTENTS

I Rear panel ……………………………………………………………… 1-12 I LCD display …………………………………………………………… 1-14 I Screen menu arrangement …………………………………………… 1-15

q POWER SWITCH [POWER] (p. 3-2) ➥Push to turn the transceiver power ON. • The [POWER] indicator above this switch lights green when powered ON. ➥Push for 1 sec. to turn the transceiver power OFF. • The [POWER] indicator lights orange when the trans- ceiver is OFF when the internal power supply is switched ON. w TRANSMIT SWITCH [TRANSMIT] Selects transmitting or receiving. • The [TX] indicator lights red while transmitting and the [RX] indicator lights green when the squelch is open. e ANTENNA TUNER SWITCH [TUNER] (p. 10-5) ➥Turns the internal antenna tuner ON and OFF (bypass) when pushed momentarily. • The [TUNER] indicator above this switch lights green when the tuner is turned ON, goes off when tuner is turned OFF (bypassed). ➥Tunes the antenna tuner manually when pushed for 1 sec. • The [TUNER] indicator blinks red during manual tun- ing. • When the tuner cannot tune the antenna, the tuning circuit is bypassed automatically after 20 sec. r TIMER SWITCH [TIMER] (p. 11-4) ➥Turns the sleep or daily timer function ON and OFF. • The [TIMER] indicator above this switch lights green when the timer is in use. ➥Enters timer set mode when pushed for 1 sec. t HEADPHONE JACK [PHONES] Accepts standard stereo headphones. • Output power: 50 mW with an 8 Ωload. • When headphones are connected, the internal speaker or connected external speaker does not function. y ELECTRONIC KEYER JACK [ELEC-KEY] (p. 2-4) Accepts a paddle to activate the internal electronic keyer for CW operation. • You can select internal electronic keyer, bug-key or straight key operation in keyer set mode. (p. 4-12) • A straight key jack is located on the rear panel. See [KEY] on p. 1-13. • Keyer polarity (dot and dash) can be reversed in keyer set mode. (p. 4-12) • 4-channel memory keyer is available for your conve- nience. (p. 4-8) u MICROPHONE CONNECTOR [MIC] Accepts an optional microphone. • See p. 15-4 for appropriate microphones. • See p. 2-9 for microphone connector information. (dot) (com) (dash) Turn the internal power supply ON in advance. The internal power supply switch is located on the rear panel. (p. 3-2) 1 PANEL DESCRIPTION q w e r t y u i o !0 !1 !2 !3 !4 !5 !6 !7 !8

Continuously varies the RF output power from min- imum (5 W*) to maximum (200 W*). *AM mode: 5 W to 50 W o MIC GAIN CONTROL [MIC] Adjusts microphone input gain. • The transmit audio tone in SSB, AM and FM modes can be adjusted independently in set mode. (p. 12-4) ✔How to set the microphone gain. Set the [MIC] control so that the ALC meter sometimes swings during normal voice transmission in SSB, AM or FM mode. !0 VOX/BREAK-IN SWITCH [VOX/BK-IN] ➥Push to turn the VOX function ON and OFF dur- ing SSB, AM and FM mode operation. (p. 6-2) ➥Push to turn the break-in function ON (semi-break- in, full-break-in) and OFF during CW mode opera- tion. (p. 6-3) ➥Push for 1 sec. to enter VOX set mode. (p. 6-2) ✔What is the VOX function? The VOX function (voice operated transmission) starts trans- mission without pushing the transmit switch or PTT switch when you speak into the microphone; then, automatically re- turns to receive when you stop speaking. ✔What is the break-in function? The break-in function switches transmit and receive with CW keying. Full break-in (QSK) can monitor the receive signal during keying. !1 ELECTRONIC CW KEYER SPEED CONTROL [KEY SPEED] (p. 4-4) Adjusts the internal electronic CW keyer’s speed. • 6 wpm (min.) to 60 wpm (max.) can be set. !2 BREAK-IN DELAY CONTROL [DELAY] (p. 6-3) Adjusts the transmit-to-receive switching delay time for CW semi-break-in operations. !3 MONITOR SWITCH [MONI] (p. 6-4) Monitors your transmitted IF signal. • The CW sidetone functions regardless of [MONI] switch setting in CW mode. • The [MONI] indicator above this switch lights green while the function is activated. !4 MEMORY CARD SLOT [CF CARD] (p. 2-3) Insert the supplied CF (Compact Flash) memory card for both reading/storing a wide variety of the transceiver’s information and data. • The indicator beside the slot lights or blinks when the transceiver reads or writes to the memory card. • Push the eject button to remove the memory card. !5 MONITOR GAIN CONTROL [MONI GAIN] (p. 6-4) Adjusts the transmit IF signal monitor level. !6 COMPRESSION LEVEL CONTROL [COMP] (p. 6-5) Adjusts the speech compression level in SSB. !7 DRIVE GAIN CONTROL [DRIVE] (p. 3-13) Adjusts the transmitter level at the driver stage. Ac- tivate in all modes (except SSB with [COMP] OFF). !8 VOX GAIN CONTROL [VOX GAIN] (p. 6-2) Adjusts the transmit/receive switching threshold level for VOX operation. Low sensitivity High sensitivity Push Decreases Increases Push Compression gain decreases Compression gain increases Push Monitor gain decreases Monitor gain increases Push Long delay for slow speed keying Short delay for high speed keying Max. 60 wpm Min. 6 wpm Recommended level for an Icom microphone Decreases Increases Increases Decreases 1 PANEL DESCRIPTION

!9 AGC CONTROL [AGC] (for MAIN band; p. 5-11) @0 AGC CONTROL [AGC] (for SUB band; p. 5-11) Adjusts the continuously-variable AGC circuit time constant. • To use [AGC] control, push the appropriate band’s [AGC VR] ([AGC VR] indicator lights). @1 AGC VOLUME SWITCH [AGC VR] (for MAIN band; p. 5-11) @2 AGC VOLUME SWITCH [AGC VR] (for SUB band; p. 5-11) ➥Push to toggle [AGC] control usage ON and OFF. • Use [AGC] control to set the AGC time constant when switched ON. • The [AGC VR] indicator above this switch lights green when the control is ON. ➥Turns the AGC function OFF when pushed for 1 sec. @3 AF CONTROL [AF] (inner control; for SUB band) @4 AF CONTROL [AF] (inner control; for MAIN band) Varies the audio output level of the speaker or headphones. @5 RF GAIN CONTROL [RF] (outer control; for MAIN band; p. 3-9) @6 RF GAIN CONTROL [RF] (outer control; for SUB band; p. 3-9) Adjusts the RF gain level. While rotating the RF gain control, you may hear noise. This comes from the DSP unit and does not indicate a malfunction. @7 SQUELCH CONTROL [SQL] (outer control; for MAIN band; p. 3-9) @8 SQUELCH CONTROL [SQL] (outer control; for SUB band; p. 3-9) Adjusts the squelch threshold level. The squelch re- moves noise output from the speaker (closed con- dition) when no signal is received. • The squelch is particularly effective for FM. It is also available for other modes. • 11 to 12 o’clock position is recommended for any set- ting of the [SQL] control. Deep Deep S-meter squelch Noise squelch Squelch is open. Squelch threshold Shallow Shallow Sensitivity increases Sensitivity decreases Audio output increases Audio output decreases Slow Fast 1 PANEL DESCRIPTION @6 @4 @5 @1 @2 @3 #2 !9 #0 #1 @9 @0 #3 #4 @7 @8

Push to select the functions indicated in the LCD display to the right of these switches. • Functions vary depending on the operating condition. ➥Selects the antenna connector from ANT1, ANT2, ANT3 and ANT4 when pushed. (p. 10-2) ➥Displays antenna selection memory when pushed for 1 sec. • When the receive antenna is activated, the antenna which is connected to [ANT4] is used for receive only. When a transverter is in use, this [ANT] does not function and ‘TRV’ appears. ➥Selects RF power (Po), SWR, ALC, COMP, VD or ID metering during transmit. (p. 3-10) ➥Switches the multi-function digital meter ON and OFF when pushed for 1 sec. (p. 3-10) ➥Selects one of 2 receive RF preamps or bypasses them. (p. 5-9) • “P. AMP1” activates 10 dB preamp. • “P. AMP2” activates 16 dB high-gain preamp. ✔What is the preamp? The preamp amplifies received signals in the front end cir- cuit to improve S/N ratio and sensitivity. Select “P. AMP1” or “P. AMP2” when receiving weak signals. ➥Selects 6 dB, 12 dB or 18 dB attenuator when pushed. (p. 5-9) ➥Selects 3 dB, 6 dB, 9 dB, 12 dB, 18 dB, or 21 dB attenuator when pushed for 1 sec. (p. 5-9) ✔What is the attenuator? The attenuator prevents a desired signal from distorting when very strong signals are near the desired frequency, or when very strong electric fields, such as from a broadcast- ing station, are near your location. ➥Activates and selects fast, middle or slow AGC time constant when pushed. (p. 5- 11) • In FM mode, only “FAST” is available. ➥Enters the AGC set mode when pushed for 1 sec. (p. 5-11) AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode), or turned OFF. When AGC is “OFF,” the S-meter does not function. ✔What is the AGC? The AGC controls receiver gain to produce a constant audio output level, even when the received signal strength varies dramatically. Select “FAST” for tuning and then select “MID” or “SLOW” depending on the receiving condition. ➥Turns the speech compressor ON and OFF in SSB mode. (p. 6-5) ➥Switches the narrow, middle or wide compression when pushed for 1 sec. ✔What is the speech compressor? The speech compressor compresses the transmitter audio input to increase the average audio output level, to increase talk power. This function is effective for long-distance com- munication or when propagation conditions are poor. ➥Turns the 1⁄4-speed tuning function ON and OFF in SSB data, CW, RTTY and PSK modes. (p. 3-6) • 1⁄4 function sets dial rotation to 1⁄4 of normal speed for fine tuning. ➥Switches between the tone encoder, tone squelch function and no-tone oper- ation when pushed in FM mode. (pgs. 4- 32, 4-33) ➥Enters the tone set mode when pushed for 1 sec. in FM mode. (pgs. 4-32, 4-33) ➥Switches the voice squelch control func- tion ON and OFF; useful for scanning. (p. 9-3) #0 TRANSMIT INDICATOR [TX] (for MAIN band) #1 TRANSMIT INDICATOR [TX] (for SUB band) Lights red while transmitting. • SUB band’s [TX] indicator lights only when in split oper- ation. #2 ANTI VOX CONTROL [ANTI VOX] (p. 6-2) Adjusts the VOX deactivate level to prevent un- wanted VOX activation from the speaker audio. #3 LCD CONTRAST CONTROL [CONTRAST] Adjusts the LCD contrast. #4 LCD BRIGHTNESS CONTROL [BRIGHT] Adjusts the LCD brightness. Dark Bright Push Low contrast High contrast Push Decreases cut-off level Increases cut-off level Push 1 PANEL DESCRIPTION

#5 NOISE REDUCTION SWITCH [NR] (for MAIN band; p. 5-18) #6 NOISE REDUCTION SWITCH [NR] (for SUB band; p. 5-18) Push to switch the DSP noise reduction ON and OFF. • The [NR] indicator above this switch lights green when the function is activated. #7 NOISE REDUCTION LEVEL CONTROL [NR] (inner control; for SUB band; p. 5-18) #8 NOISE REDUCTION LEVEL CONTROL [NR] (inner control; for MAIN band; p. 5-18) Adjusts the DSP noise reduction level when the noise reduction is in use. Set for maximum read- ability. • To use this control, push the appropriate band’s [NR]. #9 NOISE BLANKER CONTROL [NB] (outer control; for MAIN band; p. 5-17) $0 NOISE BLANKER CONTROL [NB] (outer control; for SUB band; p. 5-17) Adjust the noise blanker threshold level. • To use this control, push appropriate band’s [NB] switch. $1 NOISE BLANKER SWITCH [NB] (for MAIN band; p. 5-17) $2 NOISE BLANKER SWITCH [NB] (for SUB band; p. 5-17) ➥Switches the noise blanker ON and OFF when pushed. The noise blanker reduces pulse-type noise such as that generated by automobile igni- tion systems. This function cannot be used for FM, or non-pulse-type noise. • The [NB] indicator above this switch lights green while the function is activated. ➥Enters blank-width set mode when pushed for 1 sec. $3 RECEIVE INDICATOR [RX] (for MAIN band) $4 RECEIVE INDICATOR [RX] (for SUB band) Lights green while receiving a signal and when the squelch is open. $5 LOCK INDICATOR [LOCK] (for MAIN band; p. 5-18) $6 LOCK INDICATOR [LOCK] (for SUB band; p. 5-18) Lights when the dial lock function is activated. $7 SPLIT OPERATION INDICATOR [SPLIT] Lights during split frequency operation. $8 LCD FUNCTION DISPLAY (p. 1-14) Shows the operating frequency, function switch menus, spectrum scope screen, memory channel screen, set mode settings, etc. Deep Shallow Increases Decreases 1 PANEL DESCRIPTION #5 #6 $1 $2 #8 #9 $5 $3 $6 $9 $4 $7 $8 #7 $0 %0 %1 %3 %4 %6 %2 %5

Push to select the desired memory channel. • Memory channels can be selected both in VFO and memory modes. %0 LCD FUNCTION SWITCHES [F-1]–[F-7] Push to select the function indicated in the LCD dis- play above these switches. • Functions vary depending on the operating condition. %1 MODE SWITCHES Selects the desired mode. (p. 3-8) • Announces selected mode via the speech synthesizer. (p. 12-16) ➥Selects USB and LSB modes alternately. ➥Selects CW and CW-R (CW reverse) modes alternately. ➥Switches between RTTY and PSK mode. ➥Switches RTTY and RTTY-R (RTTY re- verse) mode when pushed for 1 sec. in RTTY mode. ➥Switches PSK and PSK-R (PSK reverse) mode when pushed for 1 sec. in PSK mode. ➥Selects AM and FM modes alternately. ➥Selects SSB, AM or FM data mode (USB- D, LSB-D, AM-D, FM-D) when pushed in SSB, AM or FM mode, respectively. ➥Switches D1, D2 and D3 when pushed for 1 sec. %2 MINI SPECTRUM SCOPE SWITCH [M.SCOPE] (p. 5-4) Turns the mini spectrum scope screen ON and OFF. • The mini spectrum scope screen can be displayed with another screen, such as memory or set mode screen, simultaneously. %3 VOICE MEMORY RECORD SWITCH [REC] (p. 7-3) ➥Records the received signal for the preset time period when pushed. • After the preset time has passed, stops recording au- tomatically. ➥Records the received signal until cancelling the record when pushed for 1 sec. • Push this switch momentarily to stops recording. • The memory records the latest 30 sec. of audio. %4 VOICE MEMORY PLAY BACK SWITCH [PLAY] (p. 7-4) ➥Plays back the previously recorded audio for the preset time period when pushed. ➥Plays back all of the previously recorded audio when pushed for 1 sec. %5 EXIT/SET SWITCH [EXIT/SET] ➥Push to exit, or return to the previous screen in- dication during spectrum scope, memory, scan or set mode screen display. ➥Displays set mode menu screen when pushed for 1 sec. %6 TRANSMIT FREQUENCY CHECK SWITCH [XFC] (p. 6-6) Monitors the transmit frequency (including ∂TX fre- quency offset) when pushed and held during split fre- quency operation. • While pushing this switch, the transmit frequency can be changed with the main dial, keypad, memo pad or [Y]/[Z] switches. • When the split lock function is turned ON, pushing [XFC] cancels the dial lock function. (p. 6-7) 1 PANEL DESCRIPTION

%7 MEMO PAD-WRITE SWITCH [MP-W] (p. 8-7) Programs the selected readout frequency and op- erating mode into a memo pad. • The 5 most recent entries remain in memo pads. • The memo pad capacity can be expanded from 5 to 10 in set mode. (p. 12-16) %8 VFO/MEMORY SWITCH [V/M] ➥Switches the selected readout operating mode between the VFO and memory when pushed. (pgs. 3-3, 8-2) ➥Transfers the memory contents to VFO when pushed for 1 sec. (p. 5-5) %9 KEYPAD ➥Pushing a key selects the operating band. • [GENE•.] selects the general coverage band. ➥Pushing the same key 2 or 3 times calls up other stacked frequencies in the band. (p. 3-4) • Icom’s triple band stacking register memorizes 3 fre- quencies in each band. ➥After pushing [F-INP•ENT], enters a frequency or memory channel. Pushing [F-INP•ENT] or [Y/[Z] is necessary to end. (pgs. 3-5, 8-2) • e.g. to enter 14.195 MHz, push [F-INP] [1.8•1] [10•4] [GENE •] [1.8•1] [28•9] [14•5] [F-INP•ENT]. ^0 MEMORY WRITE SWITCH [MW] (p. 8-4) Stores the selected readout frequency and operat- ing mode into the displayed memory channel when pushed for 1 sec. • This function is available both in VFO and memory modes. ^1 MEMO PAD-READ SWITCH [MP-R] (p. 8-7) Each push calls up a frequency and operating mode in a memo pad. The 5 (or 10) most recently pro- grammed frequencies and operating modes can be recalled, starting from the most recent. • The memo pad capacity can be expanded from 5 to 10 in set mode. (p. 12-16) ^2 FILTER SWITCH [FILTER] (for MAIN band; p. 5-13) ^3 FILTER SWITCH [FILTER] (for SUB band; p. 5-13) ➥Selects one of 3 IF filter settings. ➥Enters the filter set screen when pushed for 1 sec. ^4 AUDIO PEAK FILTER/TWIN PEAK FILTER SWITCH [APF/TPF] (for MAIN band) ^5 AUDIO PEAK FILTER/TWIN PEAK FILTER SWITCH [APF/TPF] (for SUB band) ➥Push to turn the audio peak filter ON and OFF during CW mode operation. (p. 4-6) ➥Push to turn the twin peak filter ON and OFF dur- ing RTTY mode operation. (p. 4-14) • “ ” appears when audio peak filter is in use. • “ ” appears when twin peak filter is in use. ➥During CW mode operation, push for 1 sec. to select the APF passband width from 80, 160 and 320 Hz. (p. 4-6) TPF APF 1 PANEL DESCRIPTION %7 %8 ^0 ^1 %9 &0 &8 &1 &5 &4 &2 &6 &3 &7 &9 ^2 ^3 ^5 ^4 ^6 ^7 ^9 ^8

^7 NOTCH SWITCH [NOTCH] (for MAIN band; p. 5-19) ➥Switches the notch function between auto, man- ual and OFF in SSB and AM modes. ➥Turns the manual notch function ON and OFF when pushed in CW, RTTY and PSK31 mode. ➥Turns the auto notch function ON and OFF when pushed in FM mode. • “ ” appears when auto notch is in use. • “ ” appears when manual notch is in use. ➥Switches the manual notch characteristics from wide, middle and narrow when pushed for 1 sec. ✔What is the notch function? The notch function eliminates unwanted CW or AM carrier tones while preserving the desired voice signal. The DSP cir- cuit automatically adjusts the filtering frequency to effectively eliminate unwanted tones. ^8 DUALWATCH SWITCH [DUALWATCH] (p. 5-16) ➥Turns the dualwatch function ON and OFF when pushed. ➥Turns the dualwatch function ON and equalizes the main/sub readout frequency to the sub/main readout when pushed for 1 sec. (Quick dualwatch function) • The quick dualwatch function can be turned OFF using set mode. (p. 12-14) ^9 SPLIT SWITCH [SPLIT] (p. 6-6) ➥Turns the split function ON and OFF when pushed. ➥Turns the split function ON. When pushed for 1 sec. in non-FM modes, equalizes the sub read- out frequency to the main readout and sets the sub readout for frequency input. (Quick split func- tion) • The offset frequency is shifted from the main readout frequency in FM mode. (p. 12-15) • The quick split function can be turned OFF using set mode. (p. 12-15) ➥Turns the split function ON and shifts the sub readout frequency after inputting an offset. &0 MAIN BAND ACCESS SWITCH [MAIN] Selects the main readout. • The main readout frequency is clearly displayed. The sub readout functions only during split operation or du- alwatch. &1 MAIN/SUB EQUALIZING SWITCH [M=S] Equalizes the sub readout frequency to the main readout frequency when pushed for 1 sec. &2 AUTOMATIC TUNING SWITCH [AUTO TUNE] (for MAIN band) &3 AUTOMATIC TUNING SWITCH [AUTO TUNE] (for SUB band) Turns the automatic tuning function ON and OFF in CW and AM modes. &4 MAIN DIAL Changes the displayed frequency (main band), se- lects set mode setting, etc. &5 MAIN/SUB CHANGE SWITCH [CHANGE] Switches the frequency and selected memory channel between main and sub readouts when pushed. • Switches between transmit frequency and receive fre- quency when the split frequency function is ON. (p. 6-6) &6 LOCK SWITCH [LOCK] (for MAIN band; p. 5-18) &7 LOCK SWITCH [LOCK] (for SUB band; p. 5-18) Push to switch the dial lock function ON and OFF. &8 SUB BAND ACCESS SWITCH [SUB] Selects the sub readout. • The sub readout frequency is clearly displayed. The main readout functions only during split operation or du- alwatch. &9 SUB DIAL Changes the displayed frequency in sub band. IMPORTANT! When receiving a weak signal, or receiving a sig- nal with interference, the automatic tuning func- tion may tune the receiver to an undesired signal. 1 PANEL DESCRIPTION

*0 RIT/∂TX CONTROL [RIT/∂TX] (pgs. 5-10, 6-4) Shifts the receive and/or transmit frequency without changing the transmit and/or receive frequency. • Rotate the control clockwise to increase the frequency, or rotate the control counterclockwise to decrease the frequency. The RIT or ∂TX functions must be ON. • The shift frequency range is ±9.999 kHz in 1 Hz steps (or ±9.99 kHz in 10 Hz steps). *1 PASSBAND TUNING CONTROLS [TWIN PBT] (for MAIN band; p. 5-12) *2 PASSBAND TUNING CONTROLS [TWIN PBT] (for SUB band; p. 5-12) Adjusts the receiver’s IF filter “passband width” via the DSP. • Passband width and shift frequency are displayed in the multi-function display. • Push [PBT CLEAR] for 1 sec. to clear the PBT settings. • Variable range is set to half of the IF filter passband width. 25 Hz steps and 50 Hz steps are available. ✔What is the PBT control? The PBT function electronically modifies the IF passband width to reject interference. This transceiver uses the DSP circuit for the PBT function. *3 PBT CLEAR SWITCH [PBT CLEAR] (for MAIN band; p. 5-12) *4 PBT CLEAR SWITCH [PBT CLEAR] (for SUB band; p. 5-12) Clears the PBT settings when pushed for 1 sec. • The [PBT CLEAR] indicator above this switch lights when PBT is in use. PBT1 PBT2 Low cut High cut Center – + Frequency increases Frequency decreases 1 PANEL DESCRIPTION *0 (5 (6 (7 (8 *3 *1 *2 *4 *8 *7 *9 (0 (2 (3 (4 *6 *5 (1

(for MAIN band; p. 5-19) *6 DIGITAL RF SELECTOR CONTROL [DIGI-SEL] (for SUB band; p. 5-19) Adjusts the digital RF selector center frequency. • The control can be reassigned as the audio peak filter adjustment (p. 12-18) *7 DIGITAL RF SELECTOR SWITCH [DIGI-SEL] (for MAIN band; p. 5-19) *8 DIGITAL RF SELECTOR SWITCH [DIGI-SEL] (for SUB band; p. 5-19) Turns the digital RF preselector ON and OFF. • The [DIGI-SEL] indicator lights green when the prese- lector is in use. *9 MANUAL NOTCH FILTER CONTROL [NOTCH] (for SUB band; outer control; p. 5-19) (0 MANUAL NOTCH FILTER CONTROL [NOTCH] (for MAIN band; outer control; p. 5-19) Varies the “valley” frequency of the manual notch fil- ter to reject an interfering signal while the manual notch function is ON. • Notch filter center frequency: SSB : –1060 Hz to 4040 Hz CW : CW pitch freq. + 2540 Hz to CW pitch freq. –2540 Hz AM : –5100 Hz to 5100 Hz (1 CW PITCH CONTROL [CW PITCH] (p. 4-5) Shifts the received CW audio pitch and the CW side tone pitch without changing the operating frequency. (2 RIT SWITCH [RIT] (p. 5-10) ➥Turns the RIT function ON and OFF when pushed. • Use [RIT/∂TX] control to vary the RIT frequency. ➥Adds the RIT shift frequency to the operating fre- quency when pushed for 1 sec. ✔What is the RIT function? Receiver incremental tuning (RIT) shifts the receive fre- quency without shifting the transmit frequency. This is useful for fine tuning stations calling you on off-fre- quency or when you prefer to listen to slightly different- sounding voice characteristics, etc. (3 ∂TX SWITCH [∂TX] (p. 6-4) ➥Turns the ∂TX function ON and OFF when pushed. • Use [RIT/∂TX] control to vary the ∂TX frequency. ➥Adds the ∂TX shift frequency to the operating frequency when pushed for 1 sec. ✔What is the ∂TX function? ∂TX shifts the transmit frequency without shifting the receive frequency. This is useful for simple split frequency operation in CW, etc. (4 CLEAR SWITCH [CLEAR] (pgs. 5-10, 6-4) Clears the RIT/∂TX shift frequency when pushed for 1 sec. or when pushed momentarily, depending on the quick RIT/∂TX clear function setting (p. 12- 17). (5 QUICK TUNING SWITCH [TS] (for MAIN band) (6 QUICK TUNING SWITCH [TS] (for SUB band) ➥Turns the quick tuning step ON and OFF. (p. 3- 6) • While the quick tuning indicator, “Z,” is displayed above the frequency indication, the frequency can be changed in programmed kHz steps. • 0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz steps are avail- able for each operating mode independently. ➥When the quick tuning step is OFF, push for 1 sec. to turn the 1 Hz tuning step ON and OFF. (p. 3-7) ➥When the quick tuning step is ON, push for 1 sec. to enter quick tuning step set mode. (p. 3- 6) (7 SPEECH SWITCH [SPEECH] (for MAIN band; p. 13-3) (8 SPEECH SWITCH [SPEECH] (for SUB band; p. 13-3) ➥Push to announce the S-meter indication and the selected readout frequency. ➥The selected operating mode is additionally an- nounced when pushed for 1 sec. High frequency Low frequency Higher frequency Lower frequency Higher frequency Lower frequency 1 PANEL DESCRIPTION

q ANTENNA CONNECTOR 1 [ANT 1] (p. 2-4) w ANTENNA CONNECTOR 2 [ANT 2] (p. 2-4) e ANTENNA CONNECTOR 3 [ANT 3] (p. 2-4) r ANTENNA CONNECTOR 4 [ANT 4] (p. 2-4) Accept a 50 Ωantenna with a PL-259 plug connec- tor. t GROUND TERMINAL [GND] (p. 2-3) Connect this terminal to a ground to prevent electri- cal shocks, TVI, BCI and other problems. y CIRCUIT BREAKER Cuts off the AC input when over-current occurs. u RECEIVE ANTENNA B OUT [RX ANT B– OUT] i RECEIVE ANTENNA B IN [RX ANT B– IN] Located between the transmit/receive switching cir- cuit and receiver’s RF stage in SUB band (MAIN band during split operation). Connects an external unit, such as preamplifier or RF filter, using BNC connectors, if desired. When no external unit is connected, [RX ANT B– OUT] and [RX ANT B– IN] must be shorted with the supplied coaxial cable. (p. 2-2) o TRANSVERTER CONNECTOR [X-VERTER] (p. 2-5) External transverter input/output connector. Activated by voltage applied to [ACC 2] pin 6, or when the transverter function is in use. (pgs. 2-10, 4-6) !0 RECEIVE ANTENNA A OUT [RX ANT A– OUT] !1 RECEIVE ANTENNA A IN [RX ANT A– IN] Located between the transmit/receive switching cir- cuit and receiver’s RF stage in MAIN band (SUB band during split operation). Connects an external unit, such as preamplifier or RF filter, using BNC connectors, if desired. When no external unit is connected, [RX ANT A– OUT] and [RX ANT A– IN] must be shorted with the supplied coaxial cable. (p. 2-2) !2 MAIN POWER SWITCH [I/O] (p. 3-2) Turns the internal power supply ON and OFF. !3 AC POWER SOCKET [AC] (p. 2-4) Connects the supplied AC power cable to an AC line-voltage receptacle. !4 EXTERNAL SPEAKER JACK MAIN [EXT-SP MAIN] (p. 2-5) !5 EXTERNAL SPEAKER JACK SUB [EXT-SP SUB] (p. 2-5) Connects an external speaker (4–8 Ω), if desired. Receiver Transmitter IN [RX ANT A/B] OUT Transmit/Receive switching circuit 1 PANEL DESCRIPTION MAIN SUB ACC 1 ACC 2 ACC 1 ACC 2 ALC ADJ ALC RELAY KEY EXT KEYPAD METER DC OUT 15V MAX1A REF I/O 10MHz -10dBm IN OUT REMOTE RS-232C KEY BOARD EXT-DISPLAY A B S/P DIF EXT-SP ANT 1 ANT 2 ANT 3 ANT 4 GND AC I X-VERTER A IN RX ANT B RX ANT OUT IN OUT q w e r u i o !0 !1 !4 !5 !7 !9 !6 !8 @0 @1 @2 @3 @4 @5 @6 @7 @8 @9 #0 #1 #2 #3 #4 !2 !3 t y

!7 ACCESSORY SOCKET 2 A [ACC 2–A] !8 ACCESSORY SOCKET 1 B [ACC 1–B] !9 ACCESSORY SOCKET 2 B [ACC 2–B] Enable connection of external equipment such as a linear amplifier, an automatic antenna selector/tuner, a TNC for data communications, etc. • See p. 2-10 for socket information. @0 ALC LEVEL ADJUSTMENT POT [ALC ADJ] Adjusts the ALC levels. No adjustment is required when the ALC output level of the connected non-Icom linear amplifier is 0 to –4 V DC. @1 ALC INPUT JACK [ALC] (p. 2-7) Connects to the ALC output jack of a non-Icom lin- ear amplifier. @2 T/R CONTROL JACK [RELAY] (p. 2-7) Goes to ground when transmitting to control an ex- ternal unit, such as a non-Icom linear amplifier. @3 STRAIGHT KEY JACK [KEY] (p. 2-4) Accepts a straight key or external electronic keyer with 1⁄4 inch standard plug. • [ELEC-KEY] on the front panel can be used for a straight key or external electronic keyer. Deactivate the internal electronic keyer in keyer set mode. (p. 4-12) @4 EXTERNAL KEYPAD JACK [EXT KEYPAD] (p. 2-6) Connects an external keypad for direct voice mem- ory or electronic keyer control. Transceiver mute control line (both transmit and re- ceive) is also supported. @5 METER JACK [METER] (p. 2-6) Outputs the receiving signal strength level signal, transmit output power, VSWR, ALC, speech com- pression, VD or ID level for external meter indication. @6 DC OUTPUT JACK [DC OUT] (p. 2-6) Outputs a regulated 14 V DC (approx.) for external equipment. Connected in parallel with 13.8 V out- puts of [ACC 1] and [ACC 2]. (max. 1 A in total) @7 REFERENCE SIGNAL INPUT/OUTPUT TERMINAL [REF I/O] Inputs/outputs a 10 MHz reference signal. @8 S/P DIF INPUT TERMINAL [S/P DIF– IN] (p. 2-6) @9 S/P DIF OUTPUT TERMINAL [S/P DIF– OUT] (p. 2-6) Connects external equipment that supports S/P DIF input/output. #0 CI-V REMOTE CONTROL JACK [REMOTE] (p. 2-5) ➥Connects a PC via the optional CT-17 CI-V LEVEL CONVERTER for external control of the transceiver. ➥Used for transceive operation with another Icom CI-V transceiver or receiver. #1 RS-232C TERMINAL [RS-232C] (p. 2-5) Connects an RS-232C cable, D-sub 9-pin to con- nect the IC-7800 to a PC. Can be used for remotely control the IC-7800 with- out the optional CT-17, or for RTTY/PSK31 de- coded signal output. The [RS-232C] interface is wired as a modem (DCE). #2 KEYBOARD CONNECTOR [KEYBOARD] (p. 2-6) Connects a PC keyboard for RTTY and PSK31 op- erations. • USB (Universal Serial Bus) keyboard is supported. #3 EXTERNAL DISPLAY TERMINAL [EXT-DISPLAY] (p. 2-6) Connects to an external display monitor. • At least 800×600 pixel display is necessary. #4 ETHERNET CONNECTOR (p. 16-6) Connects to a PC through a LAN (Local Area Net- work). + _ _ (+) (_) NOTE: T/R control voltage and current must be lower than 16 V DC/0.5 A (or 250 V AC, 200 mA with MOS-FET switching). 1 PANEL DESCRIPTION

q BAND WIDTH INDICATOR (p. 5-12) Shows the passband width of the IF filter. w MODE INDICATOR Shows the selected mode. e SHIFT FREQUENCY INDICATOR (p. 5-12) Shows the shift frequency of the IF filter. r QUICK TUNING INDICATOR (p. 3-6) Appears when the quick tuning step function is in use. t PASSBAND WIDTH INDICATOR (p. 5-12) Graphically displays the passband width for twin PBT operation and center frequency for IF shift op- eration. y BANDPASS FILTER INDICATOR Appears when the narrow filter (500 Hz or less) is selected during CW, RTTY or PSK31 operation. u RTTY TUNING INDICATOR Shows the tuning level in RTTY mode. i CLOCK READOUT Shows the current time. o S/RF METER (p. 3-10) Shows the signal strength while receiving. Shows the relative output power, SWR, ALC or compres- sion levels while transmitting. !0 TX INDICATOR Indicates the frequency readout for transmit. !1 VFO/MEMORY CHANNEL INDICATOR (p. 3-3) Indicates the VFO mode or selected memory chan- nel number. !2 IF FILTER INDICATOR Shows the selected IF filter number. !3 FREQUENCY READOUTS Shows the operating frequency. • Gray characters are used for non-active readout. !4 SELECT MEMORY CHANNEL INDICATOR (p. 9-7) Indicates the displayed memory channel is set as a select memory channel. !5 MEMORY CHANNEL READOUTS ➥Shows the selected memory channel contents in VFO mode. ➥Shows the VFO contents in memory mode. !6 MULTI-FUNCTION SWITCH GUIDE Indicates the function of the multi-function switches. !7 LCD FUNCTION SWITCH GUIDE Indicates the function of the LCD function switches ([F-1] – [F-7]). !8 MULTI-FUNCTION SCREEN Shows the screens for the multi-function digital meter, spectrum scope, voice recorder, memory channel, scan, memory keyer, RTTY decoder, PSK decoder, IF filter selection or set modes, etc. 1-14 1 PANEL DESCRIPTION q w e t u y i r q w e t u y r !7 !4 !5 !6 !4 !5 !3 !2 !1 !0 o !8

The following screens can be selected from the start up screen. Choose the desired screen using the fol- lowing chart. Pushing [EXIT/SET] several times returns to the start up screen. See p. 12-3 for set mode arrangement. 1 PANEL DESCRIPTION • Spectrum scope screen (p. 5-2) • Voice recorder screen (p. 7-3) • RTTY decoder screen (p. 4-13) • Memory keyer screen (CW mode; p. 4-8) • Memory channel screen (p. 8-3) • PSK31 decoder screen (p. 4-21) • Scan screen (VFO mode; p. 9-4) • Scan screen (Memory mode; p. 9-6) • Set mode menu screen (p. 12-2)

Section 2 I Unpacking ……………………………………………………………… 2-2 I Antenna jumper cable connection …………………………………… 2-2 I Selecting a location …………………………………………………… 2-2 I Rack mounting handle attachment …………………………………… 2-2 I Grounding ……………………………………………………………… 2-3 I Antenna connection …………………………………………………… 2-3 I CF (Compact Flash) memory card …………………………………… 2-3 I Required connections ………………………………………………… 2-4 D Front panel …………………………………………………………… 2-4 D Rear panel …………………………………………………………… 2-4 I Advanced connections ………………………………………………… 2-5 D Front panel …………………………………………………………… 2-5 D Rear panel—1 ……………………………………………………… 2-5 D Rear panel—2 ……………………………………………………… 2-6 I Linear amplifier connections …………………………………………… 2-7 D Connecting the IC-PW1 …………………………………………… 2-7 D Connecting a non-Icom linear amplifier …………………………… 2-7 I Transverter jack information …………………………………………… 2-8 I FSK and AFSK (SSTV) connections ………………………………… 2-8 I Microphone connector information …………………………………… 2-9 I Microphones (options) ………………………………………………… 2-9 D SM-20 ………………………………………………………………… 2-9 D HM-36 ………………………………………………………………… 2-9 I Accessory connector information …………………………………… 2-10 CAUTION!: The transceiver weighs approx. 25 kg (55 lb). Always have two people available to carry, lift or turn over the transceiver.

delivering carrier or dealer. Keep the shipping cartons. For a description and a diagram of accessory equip- ment included with the IC-7800, see ‘Supplied acces- sories’ on p. iii of this manual. I Antenna jumper cable connection Connect the supplied coaxial cable (terminated with BNC connectors) between [RX ANT A— IN] and [RX ANT A— OUT], and, [RX ANT B— IN] and [RX ANT B— OUT], respectively. When connecting an external filter unit, pre-amplifier, etc., connect the unit between [RX ANT A/B— IN] and [RX ANT A/B— OUT] connectors. I Selecting a location Select a location for the transceiver that allows ade- quate air circulation, free from extreme heat, cold, or vibrations, and away from TV sets, TV antenna ele- ments, radios and other electromagnetic sources. The base of the transceiver has an adjustable stand for desktop use. Set the stand to one of two angles de- pending on your operating preference. I Rack mounting handle attachment Remove the four screws from both sides of the front panel and the two screws from both sides of the side panel, then attach the rack mounting handles to the sides of the transceiver using the supplied screws. 2 INSTALLATION AND CONNECTIONS

(TVI), broadcast interference (BCI) and other prob- lems, ground the transceiver through the GROUND terminal on the rear panel. For best results, connect a heavy gauge wire or strap to a long earth-sunk copper rod. Make the distance be- tween the [GND] terminal and ground as short as pos- sible. R WARNING: NEVER connect the [GND] terminal to a gas or electric pipe, since the connec- tion could cause an explosion or electric shock. I Antenna connection For radio communications, the antenna is of critical im- portance, along with output power and receiver sensi- tivity. Select antenna(s), such as a well-matched 50 Ω antenna, and feedline. We recommend 1.5:1 or better of Voltage Standing Wave Ratio (VSWR) for your de- sired band. Of course, the transmission line should be a coaxial cable. When using 1 antenna, use the [ANT1] connector. CAUTION: Protect your transceiver from lightning by using a lightning arrestor. I CF (Compact Flash) memory card Insert the supplied CF (Compact Flash) memory card into the CF memory card slot. • To remove the CF memory card, push-in the button, lo- cated at left hand side of the slot. Make sure to install the memory card correctly. NEVER insert or remove the CF memory card when the read/write indicator lights or blinks. Read/write indicator Antenna SWR Each antenna is tuned for a specified frequency range and SWR may be increased out-of-range. When the SWR is higher than approx. 2.0:1, the transceiver’s power drops to protect the final transis- tors. In this case, an antenna tuner is useful to match the transceiver and antenna. Low SWR allows full power for transmitting. The IC-7800 has an SWR meter to monitor the antenna SWR continuously. 2 INSTALLATION AND CONNECTIONS PL-259 CONNECTOR INSTALLATION EXAMPLE 30 mm ≈9⁄8 in 10 mm ≈3⁄8 in 1–2 mm ≈1⁄16 in 30 mm 10 mm (soft solder) 10 mm 1–2 mm solder solder Soft solder Coupling ring Slide the coupling ring down. Strip the cable jacket and soft solder. Slide the connector body on and solder it. Screw the coupling ring onto the connector body. Strip the cable as shown at left. Soft sol- der the center con- ductor. q w e r

D Front panel D Rear panel MAIN SUB ACC 1 ACC 2 ACC 1 ACC 2 ALC ADJ ALC RELAY KEY EXT KEYPAD METER DC OUT 15V MAX1A REF I/O 10MHz -10dBm IN OUT REMOTE RS-232C KEY BOARD EXT-DISPLAY A B S/P DIF EXT-SP ANT 1 ANT 2 ANT 3 ANT 4 GND AC I X-VERTER A IN RX ANT B RX ANT OUT IN OUT Straight key A jumper cable is connected. Antenna 1, 2, 3, 4 (p. 2-3) Ground (p. 2-3) Use the heaviest gauge wire or strap available and make the connection as short as possible. Grounding prevents elec- trical shocks, TVI and oth- er problems. AC outlet R WARNING: Use the supplied AC power cable only. NOTE: Attach the sup- plied antenna connec- tor cap when no anten- na or external equip- ment is connected. [Example]: ANT1 for 1.8–18 MHz bands, ANT 2 for 21–28 bands ANT3 for 50 MHz band, ANT 4 for receive antenna. Microphones (p. 2-9) CW key A straight or bug key can be used when the internal electronic keyer is turned OFF in keyer set mode. (p. 4-12) Optional SM-20 Optional HM-36 2 INSTALLATION AND CONNECTIONS

D Front panel D Rear panel— 1 MAIN SUB ACC 1 ACC 2 ACC 1 ACC 2 ALC ADJ ALC RELAY KEY EXT KEYPAD METER DC OUT 15V MAX1A REF I/O 10MHz -10dBm IN OUT REMOTE RS-232C KEY BOARD EXT-DISPLAY A B S/P DIF EXT-SP ANT 1 ANT 2 ANT 3 ANT 4 GND AC I X-VERTER A IN RX ANT B RX ANT OUT IN OUT RX ANT A/B IN/OUT Connects an external preamp or lowpass filter. External speaker (p. 15-4) ACC sockets (pgs.2-8, 2-10) Antenna 1, 2, 3, 4 (p. 2-7) Connects a linear amplifier, antenna selector, etc. [X-VERTER] Connects a transverter for V/UHF band use. [RELAY], [ALC] (p.2-7) Used for connecting a non-Icom linear amplifier. SP-20 (option) [REMOTE], [RS-232C] (p. 14-2) Used for computer control and transceive operation. The optional CT-17 is required when con- necting a PC to [REMOTE]. MIC Headphones CF (Compact Flash) memory card The AFSK modulation signal can also be input to [MIC]. 2 INSTALLATION AND CONNECTIONS

MAIN SUB ACC 1 ACC 2 ACC 1 ACC 2 ALC ADJ ALC RELAY KEY EXT KEYPAD METER DC OUT 15V MAX1A REF I/O 10MHz -10dBm IN OUT REMOTE RS-232C KEY BOARD EXT-DISPLAY A B S/P DID EXT-SP ANT 1 ANT 2 ANT 3 ANT 4 GND AC I X-VERTER A IN RX ANT B RX ANT OUT IN OUT External Display Connects a PC-style monitor display (at least 800×600 resolution). Video output signal can be turned ON and OFF in set mode (p. 12-12) [DC OUT] Outputs regulated 14 V (approx.) DC for external equipment power supply. (max. 1 A capacity) External keypad Connects an external keypad for direct voice memory and memory keyer controls. Keyboard Connects an USB type PC keyboard directly for RTTY/PSK31 operation, as well as other text edit operations. Connects a PC for audio signal data input/output. 48 kHz, 16-bit Stereo output (L=Main band; R=Sub band) [S/P DEAF IN/OUT] Connects a PC via a LAN for the CPU firmware update. Ethernet connector (p. 16-6) 1.5 kΩ ±5% 1.5 kΩ ±5% 2.2 kΩ ±5% 4.7 kΩ ±5% S1 (T1/M1) S2 (T2/M2) S3 (T3/M3) S4 (T4/M4) EXTERNAL KEYPAD 3.5 (d) mm; 1⁄8≤ plug Mute switch: Mutes both transmission and reception when switched ON during trans- ceive operation, etc. [METER] Connects an external meter, etc. 3.5 (d) mm; 1⁄8≤ plug MAIN band meter SUB band meter 2 INSTALLATION AND CONNECTIONS

D Connecting the IC-PW1/EURO D Connecting a non-Icom linear amplifier R WARNING: Set the transceiver output power and linear ampli- fier ALC output level referring to the linear amplifier instruction manual. The ALC input level must be in the range 0 V to –4 V, and the transceiver does not accept positive voltage. Non-matched ALC and RF power settings could cause a fire or ruin the linear amplifier. The maximum control level of [RELAY] jack is 16 V/0.5 A DC with initial setting, and 250 V/200 mA with “MOS-FET” setting (see p. 12-9 for details). Use an external relay unit when your non-Icom lin- ear amplifier requires control voltage and/or current greater than specified. RF OUTPUT RF INPUT SEND ALC 50 Ω coaxial cable Transceiver ANT1 ALC RELAY To an antenna Non-Icom linear amplifier To an antenna ACC-1 ANT ANT2 ANT1 ACC 2 INPUT1 INPUT2 REMOTE EXCITER 1 1&2 GND GND IC-PW1/EURO AC outlet (Non-European versions: 100–120/220–240 V European version : 230 V) Ground Transceiver REMOTE Remote control cable (supplied with the IC-PW1/EURO) ACC cable (supplied with the IC-PW1/EURO) Be sure to connect the cable to the 7-pin ACC 2 jack. Coaxial cable (supplied with the IC-PW1/EURO) Coaxial cable* *Optional Connect [INPUT2] if necessary 2 INSTALLATION AND CONNECTIONS

When 2 to 13.8 V is applied to pin 6 of [ACC 2], the [X- VERTER] connector is activated for transverter opera- tion and the antenna connectors do not receive or transmit any signals. (p. 4-6) While receiving, [X-VERTER] connector can be acti- vated as an input terminal from an external transverter. While transmitting, the [X-VERTER] connector outputs signals of the displayed frequency at –20 dBm (22 mV) as signals for the external transverter. I FSK and AFSK (SSTV) connections To connect a TNC or scan converter, etc., refer to the diagram below. Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details. D AFSK operation • When connecting to [ACC 1] • When connecting to [MIC] • When using a PC application • When using a TNC PC RS-232C TNC or scan converter PTT Audio output AF input GND AFSK output AF input GND PTT* SQL input† *When using the VOX function, no need to connect. Refer to the instruction manual of the external equipment (TNC, etc.). †When connecting the squelch line, consult the necessary manual (TNC, etc.). q w e r t y u i 1 2 3 4 5 6 7 8 z z x x c c v v* z x c v z x c v b b n† n † b n† Rear panel view Rear panel view PC RS-232C TNC or scan converter Connect to serial port, parallel port, speaker jack, microphone jack and line IN/OUT jack, etc. See the instruction manual of the application for details. D FSK operation— when connecting to [ACC 1] • When using a PC application • When using a TNC 1 2 3 4 5 6 7 8 Rear panel view Rear panel view RTTY GND AF SEND RTTY GND AF SEND RTTY OUTPUT GND AUDIO INPUT PTT RTTY OUTPUT GND AUDIO INPUT PTT 1 2 3 4 5 6 7 8 Transverter connector 2 INSTALLATION AND CONNECTIONS

(Front panel view) CAUTION: DO NOT short pin 2 to ground as this can damage the internal 8 V regulator. NOTE: DC voltage is applied to pin 1 for micro- phone operation. Take care when using a non-Icom microphone. I Microphones (options) qUP/DOWN SWITCHES [UP]/[DN] Change the selected readout frequency or memory channel. • Continuous pushing changes the frequency or memory channel number continuously. • While pushing [XFC], the transmit readout frequency can be controlled while in split frequency operation. • The [UP]/[DN] switch can simulate a key paddle. Preset in the keyer set mode. (p. 4-12) wPTT SWITCH Push and hold to transmit; release to receive. ePTT LOCK SWITCH (available for SM-20 only) Push to toggle between transmit and receive. D SM-20 D HM-36 q w q w e y GND (PTT ground) t PTT r Main readout squelch switch q Microphone input w +8 V DC output e Frequency up/down u GND (Microphone ground) i Main readout AF output (varies with [AF]) 2 INSTALLATION AND CONNECTIONS [MIC] FUNCTION DESCRIPTION Pin No. w +8 V DC output Max. 10 mA e Frequency up Ground Frequency down Ground through 470 Ω r Squelch open “Low” level Squelch closed “High” level

2 INSTALLATION AND CONNECTIONS ACC 2 PIN No. NAME DESCRIPTION SPECIFICATIONS ACC 1 PIN No. NAME DESCRIPTION SPECIFICATIONS NOTE: If the CW side tone level limit or beep level limit is in use, the CW side tone or beep tone de- creases from the fixed level when the [AF] control is rotated above a specified leve. (p. 12-5) 1 2 3 4 5 6 7 8 “High” level : More than 2.4 V 1 RTTY Controls RTTY keying “Low” level : Less than 0.6 V Output current : Less than 2 mA 2 GND Connects to ground. Connected in parallel with ACC 2 pin 2. Input/output pin. Ground level : –0.5 V to 0.8 V 3 SEND Goes to ground when transmitting. Output current : Less than 20 mA When grounded, transmits. Input current (Tx) : Less than 200 mA Connected in parallel with ACC 2 pin 3. 4 MOD Modulator input. Input impedance : 10 kΩ Connects to a modulator. Input level : Approx. 100 mV rms AF detector output. Output impedance : 4.7 kΩ 5 AF Fixed, regardless of [AF] position Output level : 100–300 mV rms in default settings. (see notes below) 6 SQLS Squelch output. SQL open : Less than 0.3 V/5 mA Goes to ground when squelch opens. SQL closed : More than 6.0 V/100 µA 7 13.8 V 13.8 V output when power is ON. Output current : Max. 1 A Connected in parallel with ACC 2 pin 7. Control voltage : –4 V to 0 V 8 ALC ALC voltage input. Input impedance : More than 10 kΩ Connected in parallel with ACC 2 pin 5. 1 8 V Regulated 8 V output. Output voltage : 8 V ±0.3 V Output current : Less than 10 mA 2 GND Same as ACC 1 pin 2. 3 SEND Same as ACC 1 pin 3. 4 BAND Band voltage output. Output voltage : 0 to 8.0 V (Varies with amateur band) 5 ALC Same as ACC 1 pin 8. 6 TRV Activates [X-VERTER] input/output Input impedance : More than 10 kΩ when “HIGH” voltage is applied. Input voltage : 2 to 13.8 V 7 13.8 V Same as ACC 1 pin 7. 1 2 3 4 5 6 7

I Initial settings …………………………………………………………… 3-2 I Main/Sub band selection ……………………………………………… 3-3 I Selecting VFO/memory mode ………………………………………… 3-3 I Selecting an operating band …………………………………………… 3-4 D Using the band stacking registers ………………………………… 3-4 I Frequency setting ……………………………………………………… 3-5 D Tuning with the main dial …………………………………………… 3-5 D Direct frequency entry with the keypad …………………………… 3-5 D Quick tuning step …………………………………………………… 3-6 D Selecting “kHz” step ………………………………………………… 3-6 D 1⁄4 tuning step function ……………………………………………… 3-6 D Selecting 1 Hz step ………………………………………………… 3-7 D Auto tuning step function …………………………………………… 3-7 D Band edge warning beep …………………………………………… 3-7 I Operating mode selection ……………………………………………… 3-8 I Volume setting ………………………………………………………… 3-9 I RF gain adjustment …………………………………………………… 3-9 I Squelch level adjustment ……………………………………………… 3-9 I Meter indication selection …………………………………………… 3-10 D Multi-function digital meter ………………………………………… 3-10 D Meter type selection ……………………………………………… 3-11 I Basic transmit operation ……………………………………………… 3-12 D Transmitting ………………………………………………………… 3-12 D Microphone gain adjustment ……………………………………… 3-12 D Drive gain adjustment ……………………………………………… 3-13

Before first applying power, make sure all connections required for your system are complete by referring to Section 2. Then, reset the transceiver using the follow- ing procedure. Resetting CLEARS all programmed contents in memory channels and returns programmed values in set mode to default values. q Turn the main power ON with [I/O] on the rear panel. • The transceiver power is still OFF and the [POWER] in- dicator lights orange. w While pushing and holding [F-INP•ENT] and [MW], push [POWER] to turn power ON. • The CPU is reset. • The CPU start-up takes approx. 5 sec. • The transceiver displays its initial VFO frequencies when resetting is complete. e Change the set mode settings after resetting, if de- sired. In cooler temperatures, the LCD may appear dark and unstable after turning power ON. This is normal and does not indicate any equipment malfunction. I Initial settings After resetting the transceiver, set controls as shown in the figure below. [RF PWR] : Max. clockwise [MIC] : 10–12 o’clock [SQL] : Max. counter- clockwise [AGC]: 12 o’clock [DEGI-SEL] : 12 o’clock [NOTCH] : 12 o’clock [NB] : Max. counter clockwise [AF] : Max. counter- clockwise [MONI GAIN], [COMP], [DRIVE], [VOX GAIN], [ANTI VOX] : 12 o’clock [RF] : Max. clockwise [DELAY] : Max. clockwise [KEY SPEED] : 10–12 o’clock [CW PITCH] : 12 o’clock [NR] : Max. counter clockwise [F-INP•ENT] [MW] [I/O] [POWER] 3 BASIC OPERATIONS

The IC-7800 has 2 identical receivers, main and sub. The main band is displayed on the left hand side, and the sub band is displayed on the right hand side of the LCD. Some functions can only be applied to the se- lected band and transmission occurs on the main band (except during split frequency operation). ➥Push [MAIN] to select the main band. • The key backlight for [MAIN] lights. • Main band’s frequency readout highlighted. ➥Push [SUB] to select the sub band. • The key backlight for [SUB] lights. • Sub band’s frequency readout highlighted. I Selecting VFO/memory mode VFO is an abbreviation of Variable Frequency Oscilla- tor, and is commonly referred to as a main tuning func- tion. The main dial is often called the “VFO knob.” ➥Push [V/M] to switch between VFO and memory modes. • “VFO” appears when in VFO mode, or the selected memory channel number appears when in memory mode. • Pushing [V/M] for 1 sec. transfers the contents of the se- lected memory channel to VFO. (p. 8-5) “VFO” indicator Memory channel number [V/M] [MAIN] [SUB] 3-3 3 BASIC OPERATIONS

The triple band stacking register provides 3 memories for each band key, storing frequency and mode infor- mation. If a band key is pushed once, the frequency and oper- ating mode last used are called up. When the key is pushed again, another stored frequency and operating mode are called up. This function is convenient when you operate 3 modes on one band. For example, one register is used for a CW frequency, another for an SSB frequency and the other one for an RTTY frequency. See the table below for a list of the bands available and the default settings for each band. D Using the band stacking registers q Push [14•5], then select a frequency and an oper- ating mode. • Frequency and operating mode are memorized in the first band stacking register. w Push [14•5] again, then select another frequency and operating mode. • This frequency and operating mode are memorized in the second band stacking register. e Push [14•5] again, then select another frequency and operating mode. • This frequency and operating mode are memorized in the third band stacking register. • When a fourth frequency and operating mode are se- lected on a band, the first register set in step q, is over written. [Example]: 14 MHz band Band keys 3 BASIC OPERATIONS BAND REGISTER 1 REGISTER 2 REGISTER 3 1.8 MHz 1.900000 MHz CW 1.910000 MHz CW 1.915000 MHz CW 3.5 MHz 3.550000 MHz LSB 3.560000 MHz LSB 3.580000 MHz LSB 7 MHz 7.050000 MHz LSB 7.060000 MHz LSB 7.020000 MHz CW 10 MHz 10.120000 MHz CW 10.130000 MHz CW 10.140000 MHz CW 14 MHz 14.100000 MHz USB 14.200000 MHz USB 14.050000 MHz CW 18 MHz 18.100000 MHz USB 18.130000 MHz USB 18.150000 MHz USB 21 MHz 21.200000 MHz USB 21.300000 MHz USB 21.050000 MHz CW 24 MHz 24.950000 MHz USB 24.980000 MHz USB 24.900000 MHz CW 28 MHz 28.500000 MHz USB 29.500000 MHz USB 28.100000 MHz CW 50 MHz 50.100000 MHz USB 50.200000 MHz USB 51.000000 MHz FM General 15.000000 MHz USB 15.100000 MHz USB 15.200000 MHz USB

The transceiver has several tuning methods for conve- nient frequency tuning. D Tuning with the main dial q Push the desired band key on the keypad 1–3 times. • 3 different frequencies can be selected on each band with the band key. • Push [MAIN] or [SUB] to select the band. w Rotate the main dial to set the desired frequency in the main band, rotate the sub dial to set the desired frequency in the sub band. If the dial lock function is activated, the lock indicator lights, and the main dial does not function. In this case, push [LOCK] to deactivate the lock function. (see p. 5-18 for details) ✔CONVENIENT! The sub dial is always available for tuning the sub band. The sub dial allows quick tuning in the sub band without switching from main to sub. D Direct frequency entry with the keypad The transceiver has a keypad for direct frequency entry as described below. q Push [MAIN] or [SUB] to select the band. w Push [F-INP•ENT]. • “ ” indicator appears and keypad backlight lights. e Input the desired frequency • Push [GENE•.] to input “. (decimal point)” between the MHz units and kHz units. r Push [F-INP•ENT] to set the input frequency. • To cancel the input, push [Y]/[Z] instead of [F-INP•ENT]. [EXAMPLE] 7.00000 MHz 21.24000 MHz 21.24000 MHz ⇒ 21.36000 MHz Push Push Push Keypad Band keys Main dial Sub dial 3 BASIC OPERATIONS

The operating frequency can be changed in kHz steps (0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for quick tuning. q Push [TS] to turn the quick tuning function ON. • “Z” appears when the quick tuning function ON. w Rotate the main dial to change the frequency in pro- grammed kHz steps. e Push [TS] again to turn OFF the indicator. r Rotate the main dial for normal tuning if desired. D Selecting “kHz” step q Push [TS] to turn the quick tuning function ON and OFF. • “Z” appears when the quick tuning function ON. w Push [TS] for 1 sec. to enter tuning step setting dis- play. • Selected tuning steps for all modes appear. e Select the desired operating mode. r Rotate the main dial to select the desired tuning step. t Repeat steps e and r to select quick tuning steps for other modes, if desired. y Push [EXIT/SET] to exit the setting display. NOTE: When entering quick tuning step set mode, the quick tuning function must be activated first. The main and sub bands have independent tuning step settings. D 1⁄4 tuning step function When operating in SSB data, CW, RTTY or PSK, the 1⁄4 tuning function is available. Dial rotation is reduced to 1⁄4 of normal speed when the 1⁄4 tuning function is ON for finer tuning control. ➥Push [1/4] to toggle the 1⁄4 tuning function ON and OFF. • “ ” appears when the 1⁄4 tuning function is ON. 1⁄4 1⁄4 tuning step OFF 1⁄4 tuning step ON Main dial [TS] Select mode [TS] 3 BASIC OPERATIONS Quick tuning indicator Quick tuning indicator

The minimum tuning step of 1 Hz can be used for fine tuning. q Push [TS] to turn the quick tuning function OFF. w Push [TS] for 1 sec. to turn the 1 Hz tuning step ON and OFF. NOTE: 1 Hz tuning step activates for both main and sub bands simultaneously. Therefore, either [TS] can be used for the 1 Hz tuning step selection. D Auto tuning step function When rotating main or sub dial rapidly, the tuning speed accelerated automatically as selected. q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Push [F-7•SET] to select set mode menu screen. • Pushing and holding [EXIT/SET] for 1 sec. also selects set mode menu screen. e Push [F-5•OTHERS] to enter miscellaneous (oth- ers) set mode. r Push [F-1•Y] or [F-2•Z] to select “MAIN DIAL Auto TS” or “SUB DIAL Auto TS.” • “MAIN DIAL Auto TS” for main dial, “SUB DIAL Auto TS” for sub dial selection. t Rotate main dial to select the desired condition from high, low and OFF. • High : Approx. 5 times faster • Low : Approx. twice faster • OFF : Auto tuning step is turned OFF. y Push [EXIT/SET] to exit the set mode. D Band edge warning beep When you tune outside of an amateur band’s frequency range, a warning beep sounds. This function can be turned OFF in set mode, if de- sired. q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Push [F-7•SET] to select set mode menu screen. • Pushing and holding [EXIT/SET] for 1 sec. also selects set mode menu screen. e Push [F5•OTHERS] to enter miscellaneous (others) set mode. r Push [F-1•Y] or [F-2•Z] to select “Beep (Band Edge).” t Rotate main dial to turn the band edge warning beep ON and OFF. y Push [EXIT/SET] to exit the set mode. [F-1•Y][F-2•Z] [F5•OTHERS] [EXIT/SET] [F-7•SET] 1Hz step indicator 1Hz step indicator 3 BASIC OPERATIONS

SSB (USB/LSB), SSB data (USB data/LSB data), CW, CW reverse (CW-R), RTTY, RTTY reverse (RTTY-R), PSK, PSK reverse (PSK-R), AM, AM data, FM and FM data modes are available in the IC-7800. Select the desired operation mode as follows. To select a mode of operation, push the desired mode switch momentarily. Push the switch again to toggle between USB and LSB, CW and CW-R, RTTY/RTTY- R and PSK/PSK-R, AM and FM, if desired. Push the switch for 1 sec. to toggle between RTTY and RTTY- R, PSK and PSK-R, if desired. See the diagram below left for the order of selection. Microphone signals are muted when data mode is selected. • Selecting SSB mode ➥Push [SSB] to select USB or LSB. • USB is selected first when above 10 MHz; or LSB is se- lected first when below 10 MHz operation. (USB is selected when 5 MHz band is selected for the USA version.) • After USB or LSB is selected, push [SSB] to toggle be- tween USB and LSB. • Selecting CW mode ➥Push [CW] to select CW. • After CW is selected, push [CW] to toggle between CW and CW reverse mode. • Selecting RTTY/PSK mode ➥Push [RTTY/PSK] to select RTTY or PSK. • After RTTY or PSK is selected, push [RTTY/PSK] to tog- gle between RTTY and PSK. • After RTTY or PSK is selected, push [RTTY/PSK] for 1 sec. to toggle between RTTY and RTTY reverse, or, PSK and PSK reverse mode, respectively. • Selecting AM/FM mode ➥Push [AM/FM] to select AM or FM. • After AM or FM is selected, push [AM/FM] to toggle be- tween AM and FM. • Selecting DATA mode ➥After USB, LSB, AM or FM is selected, push [DATA] to select USB data, LSB data, AM data or FM data mode, respectively. • After data mode is selected, push [DATA] to toggle be- tween regular voice and data mode. • After data mode is selected, push [DATA] for 1 sec. to select data 1, 2 and 3 in sequence. USB CW AM Push mode switch for 1 sec. Push mode switch momentarily. LSB CW-R RTTY-R RTTY PSK PSK-R FM USB LSB AM FM USB-D1 LSB-D1 AM-D1 FM-D1 USB-D2 LSB-D2 AM-D2 FM-D2 USB-D3 LSB-D3 AM-D3 FM-D3 [SSB] [CW] [RTTY/PSK] [AM/FM] [DATA] 3 BASIC OPERATIONS

➥Rotate [AF] control clockwise to increase, counter- clockwise to decrease the audio output level. • Set a suitable audio level. I RF gain adjustment ➥Rotate [RF] control clockwise to increase, counter- clockwise to decrease the receiver sensitivity. I Squelch level adjustment The squelch removes noise output from the speaker (closed position) when no signal is received. ➥When no signal is received, rotate [SQL] control fully counterclockwise first, then rotate [SQL] clock- wise to the point that the noise just disappears. [SQL] for main [SQL] for sub S-meter squelch Noise squelch (Recommended level; FM mode only) Squelch is open [RF] for main [RF] for sub Sensitivity increases Sensitivity decreases [AF] for main [AF] for sub Audio output increases Audio output decreases 3 BASIC OPERATIONS

The S/RF meter indication, during transmit, can be se- lected from the following items as you desire. ➥Push [METER] several times to select the desired item. Indicates the RF output power in watts. Indicates the VSWR on the transmission line. Indicates the ALC level. The ALC circuit begins to activate when the RF output power reaches a preset level. Indicates the compression level when the speech compressor is in use. Indicates the drain current of the final amplifier MOS-FETs. Indicates the drain terminal voltage of the final amplifier MOS-FETs. D Multi-function digital meter The IC-7800 can display the multi-function digital meter in the LCD display. This meter displays all trans- mit parameters simultaneously. q Push [METER] for 1 sec. to turn the multi-function digital meter ON. w Push [F-1•P-HOLD] to toggle the peak level hold function ON. • “P-HOLD” appears on the window title when the peak level hold function is ON. e Push [METER] for 1 sec., or push [EXIT/SET] to turn the multi-function digital meter OFF. “P-HOLD” indicator S ID 0 5 10 15 0 0 10 44 ALC 52V VD 20 dB 1 1.5 2 3 ∞ 10 50 100 150 200 250 PO SWR COMP A W 1 5 9 +20 +40 +60dB Signal strength level readout ID readout Power level readout VSWR readout Compression level readout ALC level readout VD readout [METER] 3-10 3 BASIC OPERATIONS

A total of 3 meter types are available in the IC-7800— Standard, Edgewise and Bar meters. Follow the instructions below for the meter type selec- tion. q Push [EXIT/SET] several times to return to normal screen, if necessary. w Push [F-7•SET], then push [F-3•DISPLAY] to select display set mode. e Push [F-1•Y] or [F-2•Z] to select “Meter type (Nor- mal Screen)” item. r Rotate main dial to select the desired meter type from “Standard,” “Edgewise” and “Bar.” t Push [EXIT/SET] to exit display set mode. • Edgewise meter • Bar meter [F-1•Y] [EXIT/SET] [F-7•SET] [F-2•Z] [F-3•DISPLAY] 3 BASIC OPERATIONS

D Transmitting Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause inter- ference to other stations on the same frequency. qPush [TRANSMIT] or [PTT] (microphone) to trans- mit. • The main band’s [TX] indicator lights red. • When split operation is activated, the sub band’s [TX] in- dicator lights. wPush [TRANSMIT] again or release [PTT] (micro- phone) to return to receive. ✔Adjusting the transmit output power ➥Rotate [RF PWR]. • Adjustable range : 5 W to 200 W (AM mode: 5 W to 50 W) D Microphone gain adjustment Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause inter- ference to other stations on the same frequency. qPush [METER] to select the ALC meter. wPush [PTT] (microphone) to transmit. • Talk into the microphone at your normal voice level. eWhile talking into the microphone, rotate [MIC] so that the ALC meter reading doesn’t go outside the ALC zone. (see at left) r Release [PTT] (microphone) to return to receive. S ID 0 5 10 15 0 0 10 44 ALC 52V VD 20 dB 1 1.5 2 3 ∞ 10 50 100 150 200 250 PO SWR COMP A W 1 5 9 +20 +40 +60dB ALC zone [MIC] [METER] Increases max. 200 W (50 W for AM) Decreases min. 5 W [TRANSMIT] [RF PWR] [TX] indicator Before transmitting, monitor your selected oper- ating frequency to make sure transmitting won’t cause interference to other stations on the same frequency. It’s good amateur practice to listen first, and then, even if nothing is heard, ask “is the frequency in use” once or twice, before you being operating on that frequency. 3 BASIC OPERATIONS

The drive gain is active for all modes except SSB with- out speech compressor. The [DRIVE] control adjusts the amplifying gain at the driver stage. Before transmitting, monitor your selected operating frequency to make sure transmitting won’t cause inter- ference to other stations on the same frequency. qPush [METER] to select the ALC meter. wPush [PTT] (microphone; SSB with [COMP] ON, AM or FM), key down (CW) or push [TRANSMIT] (RTTY or PSK) to transmit. eWhile talking into the microphone, keying down or transmitting, rotate [DRIVE] so that the ALC meter reading swinging within 30 to 50% of the ALC scale. (see left) • Talk into the microphone at your normal voice level. rRelease [PTT], stop keying or push [TRANSMIT] again to return to receive. [DRIVE] [METER] 3 BASIC OPERATIONS S ID 0 5 10 15 0 0 10 44 ALC 52V VD 20 dB 1 1.5 2 3 ∞ 10 50 100 150 200 250 PO SWR COMP A W 1 5 9 +20 +40 +60dB Drive gain range

Section 4 I Operating SSB ………………………………………………………… 4-2 D Convenient functions for receive ……………………………………4-2 D Convenient functions for transmit ……………………………………4-3 D About 5 MHz band operation (USA version only) …………………4-3 I Operating CW …………………………………………………………… 4-4 D Convenient functions for receive ……………………………………4-4 D Convenient functions for transmit ……………………………………4-5 D About CW reverse mode ……………………………………………4-5 D About CW pitch control ………………………………………………4-5 D CW side tone function ………………………………………………4-5 D APF (Audio Peak Filter) operation …………………………………4-6 D About 137 kHz band operation (Europe, UK, Italy, Spain, France versions only) …………………………………………………………4-6 I Electronic keyer functions ……………………………………………… 4-7 D Memory keyer screen …………………………………………………4-8 D Editing a memory keyer ………………………………………………4-9 D Contest number set mode …………………………………………4-10 D Keyer set mode ………………………………………………………4-11 I Operating RTTY (FSK) ……………………………………………… 4-13 D Convenient functions for receive …………………………………4-14 D About RTTY reverse mode …………………………………………4-14 D Twin peak filter ………………………………………………………4-14 D Functions for the RTTY decoder indication ………………………4-15 D Setting the decoder threshold level ………………………………4-15 D RTTY memory transmission ………………………………………4-16 D Automatic transmission/reception setting …………………………4-16 D Editing RTTY memory ………………………………………………4-17 D RTTY decode set mode ……………………………………………4-18 D Data saving …………………………………………………………4-20 I Operating PSK ………………………………………………………… 4-21 D Convenient functions for receive …………………………………4-22 D About BPSK and QPSK mode ……………………………………4-22 D Functions for the PSK decoder indication ………………………4-23 D Setting the decoder threshold level ………………………………4-23 D PSK memory transmission …………………………………………4-24 D Automatic transmission/reception setting …………………………4-24 D Editing PSK memory ………………………………………………4-25 D PSK decode set mode ………………………………………………4-26 D Data saving …………………………………………………………4-28 I Operating AM ………………………………………………………… 4-29 D Convenient functions for receive …………………………………4-29 D Convenient functions for transmit …………………………………4-30 I Operating FM ………………………………………………………… 4-31 D Convenient functions for receive …………………………………4-31 D Convenient functions for transmit …………………………………4-31 I Repeater operation …………………………………………………… 4-32 D Repeater tone frequency setting …………………………………4-32 I Tone squelch operation ……………………………………………… 4-33 I Data mode (AFSK) operation ………………………………………… 4-34

q Push a band key to select the desired band. w Push [SSB] to select LSB or USB. • “USB” or “LSB” appears. • Below 10 MHz LSB is automatically selected; above 10 MHz USB is automatically selected. e Rotate the main dial to tune a desired signal. • The S-meter indicates received signal strength when signal is received. r Rotate [AF] to set audio to a comfortable listening level. t Push [TRANSMIT] or [PTT] (microphone) to trans- mit. • [TX] indicator lights red. y Speak into the microphone at your normal voice level. • Adjust the microphone gain with [MIC] at this step, if necessary. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive. D Convenient functions for receive • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON, respectively. (Main and sub have independent preamp controls.) • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. • Noise blanker (p. 5-17) ➥Push [NB] switch to turn the noise blanker ON and OFF, and then rotate [NB] control to adjust the threshold level. • Noise blanker indicator (above [NB] switch) lights when the noise blanker is ON. • Push [NB] for 1 sec. to enter noise blanker set mode. • Twin PBT (passband tuning) (p. 5-12) ➥Rotate [TWIN PBT] controls (inner/outer). • Push [PBT CLEAR] to clear the settings. • Audio tone control (p. 12-4) ➥Push [F-7•SET] then [F-1•LEVEL] to enter level set mode. Select an item with [F-1•Y]/[F-2•Z] then rotate the main dial to adjust the audio tone. • Noise reduction (p. 5-18) ➥Push [NR] switch to turn the noise reduction ON and OFF. • Rotate [NR] control to adjust the noise reduction level. • Noise reduction indicator (above [NR] switch) lights when the noise reduction is ON. • Auto notch filter (p. 5-19) ➥Push [NOTCH] switch to turn the auto or manual notch function ON and OFF. • Rotate [NOTCH] control to set the “valley” frequency for manual notch operation. • Notch indicator (above [NOTCH] switch) lights when either the auto or manual notch is ON. • AGC (auto gain control) (p. 5-11) ➥Push [AGC] switch several times to select AGC FAST, AGC MID or AGC SLOW. ➥Push [AGC VR] to turn the AGC time constant manual setting ON and OFF. • Rotate [AGC] control to adjust the time constant. • VSC (voice squelch control) (p. 9-3) ➥Push [VSC] to turn the VSC function ON and OFF. • The VSC indicator appears when the voice squelch function is set to ON. Appears [MIC] [TX] indicator [RX] indicator [AF] [SSB] [TRANSMIT] Main dial Band keys 4 RECEIVE AND TRANSMIT

D About 5 MHz band operation (USA version only) Operation on the 5 MHz band is allowed on 5 discrete frequencies and must adhere to the following: • USB mode • Maximum of 50 watts ERP (Effective Radiated Power) • 2.8 kHz bandwidth It’s your responsibility to set all controls so that trans- mission in this band meets the stringent conditions under which we may use these frequencies. NOTE: We recommend that you store these fre- quencies, mode and filter settings into memory channels for easy recall. *The FCC specifies center frequencies on the 5 MHz band. However, the IC-7800 displays carri- er frequency. Therefore, tune the transceiver to 1.5 kHz below the specified FCC channel center frequency. • Speech compressor (p. 6-5) ➥Push [COMP] to turn the speech compressor ON and OFF. • Pushing [COMP] for 1 sec. to select the compression bandwidth from wide, middle and narrow. • VOX (voice operated transmit) (p. 6-2) ➥Push [VOX/BK-IN] to turn the VOX function ON and OFF. • “VOX” appears when the VOX function is ON. • Transmit quality monitor (p. 6-4) ➥Push [MONI] to turn the monitor function ON and OFF. • Rotate [MONI GAIN] to adjust the monitor gain. • Monitor indicator (above [MONI] switch) lights when the monitor function is ON. • Audio tone control (p. 12-4) ➥Push [F-7•SET] then [F-1•LEVEL] to enter level set mode. Select an item with [F-1•Y]/[F-2•Z] then rotate the main dial to adjust the audio tone. 4-3 4 RECEIVE AND TRANSMIT IC-7800 Tuning FCC Channel Frequency* Center Frequency* 5.33050 MHz 5.33200 MHz 5.34650 MHz 5.34800 MHz 5.36650 MHz 5.36800 MHz 5.37150 MHz 5.37300 MHz 5.40350 MHz 5.40500 MHz To assist you in operating the 5 MHz band within the rules specified by the FCC, transmission is illegal on any 5 MHz band frequency other than the 5 fre- quencies indicated in the table above.

q Push a band key to select the desired band. w Push [CW] to select CW. • After CW mode is selected, push [CW] to toggle be- tween CW and CW-R modes. • “CW” or “CW-R” appears. e Rotate the main dial to tune a desired signal. • Try to match the specified signal’s tone to the side tone frequency. • The S-meter indicates received signal strength when signal is received. r Rotate [AF] to set audio to a comfortable listening level. t Push [TRANSMIT] to transmit. • [TX] indicator lights red. y Use the electric keyer or paddle to key your CW sig- nals. • The power meter indicates transmitted CW output power. u Adjust CW speed with [KEY SPEED]. • Adjustable within 6–60 WPM. i Push [TRANSMIT] to return to receive. D Convenient functions for receive • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON. Main and sub have independent preamp controls. • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. • Noise blanker (p. 5-17) ➥Push [NB] switch to turn the noise blanker ON and OFF, and then rotate [NB] control to adjust the threshold level. • Noise blanker indicator (above [NB] switch) lights when the noise blanker is ON. • Push [NB] for 1 sec. to enter noise blanker set mode. • Noise reduction (p. 5-18) ➥Push [NR] switch to turn the noise reduction ON and OFF. • Rotate [NR] control to adjust the noise reduction level. • Noise reduction indicator (above [NR] switch) lights when the noise reduction is ON. • Twin PBT (passband tuning) (p. 5-12) ➥Rotate [TWIN PBT] controls (inner/outer). • Push [PBT CLEAR] to clear the settings. • Manual notch filter (p. 5-19) ➥Push [NOTCH] switch to turn the manual notch function ON and OFF. • Rotate [NOTCH] control to set the attenuating fre- quency. • Notch indicator (above [NOTCH] switch) lights when either the manual notch is ON. • AGC (auto gain control) (p. 5-11) ➥Push [AGC] switch several times to select AGC FAST, AGC MID or AGC SLOW. ➥Push [AGC VR] to turn the AGC time constant manual setting ON and OFF. • Rotate [AGC] control to adjust the time constant. • 1⁄4 function (p. 3-6) ➥Push [1/4] to turn the 1⁄4 function ON and OFF. • Auto tuning function (p. 1-9) ➥Push [AUTO TUNE] to turn the auto tuning func- tion ON and OFF. • The transceiver automatically tunes the desired sig- nal within a ±500 Hz range. IMPORTANT! When receiving a weak signal, or receiving a signal with interference, the automatic tuning function may not tune properly, or tune onto an undesired signal. Appears [KEY SPEED] [TX] indicator [RX] indicator [AF] [CW] [TRANSMIT] Main dial Band keys 4 RECEIVE AND TRANSMIT

D About CW reverse mode CW-R (CW Reverse) mode uses the opposite side band to receive CW signals. Use when interfering signals are near a desired signal and you want to use CW-R to reduce the interference. ➥During CW mode, push [CW] to select CW and CW- R mode. D About CW pitch control The received CW audio pitch and CW side tone can be adjusted to suit your preference (from 300 to 900 Hz in 5 Hz steps). This does not change the oper- ating frequency. ➥Rotate [CW PITCH] to suit your preference. • Adjustable within 300 to 900 Hz in 25 Hz steps. D CW side tone function When the transceiver is in the receive condition (and the break-in function is OFF— p. 6-3) you can listen to the CW side tone without actually transmitting. This allows you to match your transmit frequency ex- actly to another station’s by matching the audio tone. You can also use the CW side tone (be sure to turn OFF break-in!) to practice CW sending. CW side tone level can be adjusted in level set mode (p. 12-5). [MONI GAIN] [CW PITCH] Push BFO CW-R mode (USB side) BFO Desired signal CW mode (LSB side) Interference Desired signal Interference • Break-in function (p. 6-3) ➥Push [VOX/BK-IN] several times to select the break-in OFF, semi break-in and full break-in. • “BK IN” or “F-BK IN” appears when the semi break-in or full break-in function is ON, respectively. 4 RECEIVE AND TRANSMIT

The APF changes the audio frequency response by boosting a particular frequency to enhance a desired CW signal. The peak frequency can be adjusted with [DIGI-SEL] control when “APF” is selected for “DIGI-SEL VR Op- eration” in miscellaneous (others) set mode (p. 12-18). q During CW mode, push [APF/TPF] to turn the audio peak filter ON and OFF. • “ ” appears in the display and [APF/TPF] indicator above this switch lights green. w Push [APF/TPF] for 1 sec. several times to select the desired audio filter width. • 320, 160 and 80 Hz filters are available. e If “APF” is selected for “DIGI-SEL VR Operation,” rotate [DIGI-SEL] control to suit your preference. D About 137 kHz band operation (Europe, UK, Italy, Spain, France versions only) 137 kHz band, within the 135.7 kHz to 137.8 kHz range, operation in CW mode is optionally available with the IC-7800. The RF signal from [X-VERTER] is used for the 137 kHz band operation, and an external amplifier unit is necessary. See the connection diagram below for reference. • Connection diagram for 137 kHz band operation PA BPF or LPF Power amplifier with T/R switching unit for 137 kHz to [X-VERTER] to [RELAY] (for transmit/receive control) to [ACC2] pin 6* *Transverter ON/OFF control signal related to the power amplifier unit main power, if desired. • ON: 2–13.8 V DC input (more than 10 kΩ impedance) • OFF: Less than 2 V DC APF [DIGI-SEL] (SUB) [DIGI-SEL] (MAIN) [APF/TPF] (MAIN) [APF/TPF] (SUB) 4 RECEIVE AND TRANSMIT

The IC-7800 has a number of convenient functions for the built-in electronic keyer. q During CW mode, push [EXIT/SET] several times to normal screen, if necessary. w Push [F-3•KEYER] to select memory keyer screen. e Push [EXIT/SET] to select memory keyer menu screen. r Push one of the multi-function keys ([F-1] to [F-4]) to select the desired menu. See the diagram below. • Push [EXIT/SET] to return to the previous display. • Memory keyer screen (p. 4-8) • Memory keyer menu screen • Memory keyer edit screen (p. 4-9) • Contest number set mode (p. 4-10) • Keyer set mode screen (p. 4-11) [EXIT/SET] [CW] [F-1]–[F-4] 4 RECEIVE AND TRANSMIT

Pre-set characters can be sent using the keyer send menu. Contents of the memory keyer are set using the edit menu. • Transmitting q During CW mode operation, push [F-3•KEYER] to select memory keyer screen. w Push [TRANSMIT] to set the transceiver to trans- mit, or set the break-in function ON (p. 6-3). e Push one of the function keys ([F-1•M1] to [F-4•M4]) to send the contents of the memory keyer. • Pushing a function key for 1 sec. repeatedly sends the contents; push any function key to cancel the transmis- sion. • The contest serial number counter is incremented each time the contents are sent. • Push [F-5•–1] to reduce the contest serial number count by 1 when resending contents to unanswered calls. For your information When an external keypad is connected to [EXT KEYPAD] connector on the rear panel, the pro- grammed contents, M1—M4, can be transmitted without selecting the memory keyer screen. See p. 2-6 for details. r Push [EXIT/SET] twice to return to normal screen. [CW] [TRANSMIT] [F-1•M1]–[F-5•–1] [EXIT/SET] 4 RECEIVE AND TRANSMIT • Memory keyer screen

The contents of the memory keyer memories can be set using the memory keyer edit menu. The memory keyer can memorize and re-transmit 4 CW key codes for often-used CW sentences, contest serial numbers, etc. Total capacity of the memory keyer is 70 charac- ters per memory channel. • Programming contents q During CW mode operation, push [F-3•KEYER] to select memory keyer screen. w Push [EXIT•SET] to select memory keyer menu, then push [F-2•EDIT] to select keyer edit screen. • Memory keyer contents of Channel 1 (M1) is selected. e Push [F-7•M1..M4] several times to select the de- sired memory keyer channel to be edited. r Push [ABC] or [123] or [Symbol] to select the char- acter group, then rotate the main dial to select the character, or push the keypad for number input. • [Symbol] appears when [123] is pushed when “123” character group is selected. • Selectable characters (using the main dial); NOTE: “^” is used to transmit a following word with no space such as AR. Put “^” before a text string such as ^AR, and the string “AR” is sent with no space. “✱” is used to insert the CW contest serial num- ber. The serial number automatically increments by 1. This function is only available for one mem- ory keyer channel at a time. Memory keyer chan- nel M2 used “✱” by default. ✔For your convenience When a PC keyboard is connected to [KEYBOARD] connector on the rear panel, the memory keyer con- tents can also be edited from the keyboard. t Push [F-1•Ω] or [F-2•≈] to move the cursor back- wards or forwards, respectively. • Pushing [F-3•DEL] deletes a character and [F-4•SPACE] inserts a space. y Repeat steps r and t to input the desired charac- ters. u Push [EXIT/SET] twice to return normal screen. [F-1•Ω] [ABC] [123]/[Symbol] [F-7•M1..M4] [EXIT/SET] [F-2•≈] [F-3•DEL] [F-4•SPACE] 4 RECEIVE AND TRANSMIT • Memory keyer edit screen Key selection Editable characters A to Z (capital letters) 0 to 9 (numbers) / ? ^ . , @ ✱ • Example— entered “QSL TU DE JA3YUA TEST” into memory keyer channel 3 CH Contents M1 CQ TEST CQ TEST DE ICOM ICOM TEST M2 UR 5NN✱BK M3 CFM TU M4 QRZ? • Pre-programmed contents

This menu is used to set the contest (serial) number and count up trigger, etc. • Setting contents q During CW mode operation, push [F-3•KEYER] to select memory keyer screen. w Push [EXIT•SET] to select memory keyer menu, then push [F-3•001] to select contest serial number set mode. e Push [F-1•Y] or [F-2•Z] to select the desired set item. r Set the desired condition using the main dial. • Push [F-4•DEF] for 1 sec. to select the default condition or value. • Contest number set mode screen t Push [EXIT/SET] twice to normal screen. [F-1•Y] Main dial [EXIT/SET] [F-2•Z][F-4•DEF] 4 RECEIVE AND TRANSMIT This item sets the numbering system used for contest (serial) numbers— normal or short morse numbers. • Normal : Does not use short morse numbers (default) • 190➔ANO : Sets 1 as A, 9 as N and 0 as O. • 190➔ANT : Sets 1 as A, 9 as N and 0 as T. • 90➔ NO : Sets 9 as N and 0 as O. • 90➔ NT : Sets 9 as N and 0 as T. This selects which of the four memories will contain the contest serial number exchange. The count-up trigger allows the serial number to automatically in- cremented after each complete serial number ex- change is sent. • M1, M2, M3 and M4 can be set. (default: M2) This item shows the current number for the count-up trigger channel set above. • Rotate the main dial to change the number, or push [F-3•001CLR] for 1 sec. to reset the current number to 001.

This set mode is used to set the memory keyer repeat time, dash weight, paddle specifications, keyer type, etc. • Setting contents q During CW mode operation, push [F-3•KEYER] to select memory keyer screen. w Push [EXIT•SET] to select memory keyer menu, then push [F-4•CW KEY] to select keyer set mode. e Push [F-1•Y] or [F-2•Z] to select the desired set item. r Set the desired condition using the main dial. • Push [F-4•DEF] for 1 sec. to select the default condition or value. • Keyer set mode screen t Push [EXIT/SET] twice to normal screen. [F-1•Y] Main dial [EXIT/SET] [F-2•Z][F-4•DEF] 4 RECEIVE AND TRANSMIT When sending CW using the repeat timer, this item sets the time between transmission. • 1 to 60 sec. in 1 sec. steps can be selected. (default: 2 sec.) This item sets the dot/dash ratio. Keying weight example: Morse code “K” • 1:1:2.8 to 1:1:4.5 (in 0.1 steps) can be selected. (default: 1:1:3.0) DASH Weight setting: 1:1:3 (default) Weight setting: Adjusted DASH DOT (fixed*) Adjustable range SPACE (fixed*) *SPACE and DOT length can be adjusted with [KEY SPEED] only. This item sets the rise time of the transmitted CW en- velope. • 2, 4, 6 or 8 msec. can be selected. (default: 4 msec.) Key action Tx output power • About rise time Rise time Tx Rx Set Tx power level Time 0 to be continued…

4 RECEIVE AND TRANSMIT This item sets the paddle polarity. • Normal and reverse polarity can be selected. This item selects the keyer type for [ELEC-KEY] con- nector on the front panel. • ELEC-KEY, BUG-KEY and Straight key can be se- lected. (default: ELEC-KEY) This item allows you to set the microphone [UP]/[DN] keys to be used as a paddle. • ON : [UP]/[DN] switches can be used for CW. • OFF : [UP]/[DN] switches cannot be used for CW. NOTE: When “ON” is selected, the frequency and memory channel cannot be changed using the [UP]/[DN] switches.

A DSP-based high-quality Baudot RTTY encoder/de- coder is built-in to the IC-7800. When connecting a PC keyboard (p. 2-6), RTTY operation can be performed without an external RTTY terminal, TNC or PC. If you would rather use your RTTY terminal or TNC, consult the manual that comes with the RTTY terminal or TNC. q Push a band key to select the desired band. w Push [RTTY/PSK] to select RTTY. • After RTTY mode is selected, push [RTTY/PSK] for 1 sec. to toggle between RTTY and RTTY-R modes. • “RTTY” or “RTTY-R” appears. e Push [F-3•DECODE] to display the decoder screen. • The IC-7800 has a built-in Baudot decoder. r To tune the desired signal, aim for a symmetrical wave form and ensure the peak points align with the mark (2125 Hz) and shift (170 Hz) frequency lines in the FFT scope. • The S-meter indicates received signal strength when signal is received. t Press [F12] on the connected keyboard to transmit. • [TX] indicator lights red. y Type from the keyboard to enter the contents that you want to transmit. • The typewritten contents are indicated in the TX buffer screen and transmitted immediately. • The text color will be changed when transmitted. • Press one of [F1]–[F8] to transmit the TX memory con- tents. u Press [F12] on the keyboard to return to receive. ✔For your convenience The transmission contents can be typed before being transmitted. q Perform the steps q to r above. w Type from the connected keyboard to enter the message that you want to transmit. • The typewritten contents are indicated in the TX buffer screen. e Press [F12] of the connected keyboard to transmit the typewritten contents. • The color of displayed text, in the TX buffer screen, will be changed when transmitted. • To cancel the transmission, press [F12] twice. r Press [F12] of the keyboard to return to receive. FFT scope TX buffer screen RX contents screen Water-fall Appears [TX] indicator [RX] indicator [F-3•DECODE] [RTTY/PSK] [AF] Main dial Band keys 4 RECEIVE AND TRANSMIT

D About RTTY reverse mode Received characters are occasionally garbled when the received signal has Mark and Space tones re- versed. This reversal can be caused by incorrect TNC connections, setting, commands, etc. To receive re- versed RTTY signals correctly, select RTTY-R mode. ➥During RTTY mode, push [RTTY/PSK] for 1 sec. to select RTTY and RTTY-R mode. D Twin peak filter The twin peak filter changes audio frequency response by boosting the mark and space frequencies (2125 and 2295 Hz) for better reception of RTTY signals. ➥During RTTY mode, push [APF/TPF] to turn the twin peak filter ON and OFF. • “ ” appears in the LCD and the [APF/TPF] indicator above this switch lights green while the filter is in use. NOTE: When the twin peak filter is in use, the re- ceived audio output may increase. This is a normal, not a malfunction. TPF [APF/TPF] (SUB) [APF/TPF] (MAIN) Normal Reverse Space Mark BFO Space Mark BFO 170 Hz 2125 Hz 170 Hz 2125 Hz • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON. Main and sub have independent preamp controls. • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. • Noise blanker (p. 5-17) ➥Push [NB] switch to turn the noise blanker ON and OFF, and then rotate [NB] control to adjust the threshold level. • Noise blanker indicator (above [NB] switch) lights when the noise blanker is ON. • Push [NB] for 1 sec. to enter noise blanker set mode. • Twin PBT (passband tuning) (p. 5-12) ➥Rotate [TWIN PBT] controls (inner/outer). • Push [PBT CLEAR] to clear the settings. • Noise reduction (p. 5-18) ➥Push [NR] switch to turn the noise reduction ON and OFF. • Rotate [NR] control to adjust the noise reduction level. • Noise reduction indicator (above [NR] switch) lights when the noise reduction is ON. • Auto notch filter (p. 5-19) ➥Push [NOTCH] switch to turn the manual notch function ON and OFF. • Rotate [NOTCH] control to set the attenuating fre- quency. • Notch indicator (above [NOTCH] switch) lights when either the manual notch is ON. • AGC (auto gain control) (p. 5-11) ➥Push [AGC] switch several times to select AGC FAST, AGC MID or AGC SLOW. ➥Push [AGC VR] to turn the AGC time constant manual setting ON and OFF. • Rotate [AGC] control to adjust the time constant. • 1⁄4 function (p. 3-6) ➥Push [1/4] to turn the 1⁄4 function ON and OFF. 4 RECEIVE AND TRANSMIT

q Push a band key to select the desired band. w Push [RTTY/PSK] to select RTTY. • After RTTY mode is selected, push [RTTY/PSK] for 1 sec. to toggle between RTTY and RTTY-R modes. • “RTTY” or “RTTY-R” appears. e Push [F-3•DECODE] to display the decoder screen. • When tuned into an RTTY signal, decoded characters are displayed in the RX contents screen. r Push [F-2•HOLD/CLR] to freeze the current screen. • “ ” appears while the function is in use. • Push [F-2•HOLD/CLR] again to release the function. t Push [F-2•HOLD/CLR] for 1 sec. to clear the dis- played characters. • “ ” indicator disappears at the same time when the hold function is in use. y Push [F-7•WIDE] to toggle the RTTY decode screen size from normal and wide. • S/RF meter type during wide screen indication can be selected in display set mode. (pgs. 3-11, 12-11) u Push [F-6•MAIN/SUB] to toggle the MAIN and SUB band for decode operation. • Dualwatch function (p. 5-16) should be ON when SUB band is selected for decode operation. i Push [EXIT/SET] to close the RTTY decode screen. • Wide screen indication D Setting the decoder threshold level Adjust the RTTY decoder threshold level if some char- acters are displayed when no signal is received. q Select the RTTY decoder screen as described above. w Push [F-5•ADJ] to select the threshold level setting condition. e Rotate the main dial to adjust the RTTY decoder threshold level. • Push [F-6•DEF] for 1 sec. to select the default setting. r Push [F-5•ADJ] to exit from the threshold level set- ting condition. The UnShift On Space (USOS) function and new line code can be set in the RTTY set mode. (p. 4- 18) HOLD HOLD [F-6•MAIN/SUB] [F-7•WIDE] [F-2•HOLD/CLR] [RTTY/PSK] [EXIT/SET] 4 RECEIVE AND TRANSMIT

Pre-set characters can be sent using the RTTY mem- ory. Contents of the memory are set using the edit menu. q During RTTY mode operation, push [F-3•DECODE] to select RTTY decode screen. w Push [F-4•TX MEM] to select RTTY memory screen. e Push [F-7•1–4/5–8] to select memory bank then push one of the function keys ([F-1•RT1] to [F-4•RT4] or [F-1•RT5] to [F-4•RT8]). • When no keyboard is connected, the selected memory contents will be transmitted immediately. • When a keyboard is connected, the memory contents will be transmitted immediately when function key is pushed, or transmitted after [F12] on the connected key- board is pressed, depending on auto transmission/re- ception setting (see below). • The transmission date, time, reception date and/or time may be displayed in RX contents screen, depending on setting. D Automatic transmission/reception setting q During RTTY mode operation, push [F-3•DECODE] to select RTTY decode screen. w Push [F-4•TX MEM] to select RTTY memory screen, then push [F-6•EDIT] to select RTTY mem- ory edit screen. • RTTY memory contents of the Channel 1 (RT1) is se- lected. e Push [F-7•RT1..RT8] several times to select the de- sired RTTY memory. r Push [F-6•AUTO TX] several times to select the de- sired condition as follow. • AUTO TX/RX : Automatically transmits the se- lected memory and returns to re- ceive after the transmission. • AUTO TX : Automatically transmits the se- lected memory. To return to re- ceive, press [F12] on the key- board. • AUTO RX : Press [F12] on the keyboard to transmit the selected memory. Au- tomatically returns to receive after the transmission. • No indication : Press [F12] on the keyboard to transmit the selected memory and press [F12] again to return to re- ceive. t Push [EXIT/SET] to exit RTTY memory edit condi- tion. NOTE: The transceiver always functions as the “AUTO TX/RX” setting when no keyboard is con- nected. [F-6•AUTO TX] [F-7•RT1..RT8] [EXIT/SET] [F-7•1–4/5–8] [F-1•RT1]–[F-4•RT4] [F-1•RT5]–[F-4•RT8] [EXIT/SET] 4 RECEIVE AND TRANSMIT

The contents of the RTTY memories can be set using the memory edit menu. The memory can store and re- transmit 8 RTTY message for often-used RTTY infor- mation. Total capacity of the memory is 70 characters per memory channel. • Programming contents q During RTTY mode operation, push [F-3•DECODE] to select RTTY decode screen. w Push [F-4•TX MEM] to select RTTY memory screen, then push [F-6•EDIT] to select RTTY mem- ory edit screen. • RTTY memory contents of the Channel 1 (RT1) is se- lected. e Push [F-7•RT1..RT8] to several times to select the desired RTTY memory channel to be edited. r Push [F-5•Ω≈] to select the edit item between memory contents and memory name. t Push [ABC], [abc], [123] or [Symbol] to select the character group, then rotate the main dial to select the character, or push the keypad for number input. • [abc] appears when [ABC] is pushed when “ABC” char- acter group is selected, and [Symbol] appears when [123] is pushed when “123” character group is selected. • Selectable characters (with the main dial); ✔For your convenience When a PC keyboard is connected to [KEYBOARD] connector on the rear panel, the RTTY memory contents can also be edited from the keyboard. y Push [F-1•Ω] or [F-2•≈] to move the cursor back- wards or forwards, respectively. • Pushing [F-3•DEL] deletes a character and [F-4•SPACE] inserts a space. u Repeat steps t and y to input the desired charac- ters. i Push [EXIT/SET] to set the contents and exit RTTY memory edit screen. [F-1•Ω] [ABC]/[abc] [123]/[Symbol] [F-7•RT1..RT8] [EXIT/SET] [F-2•≈] [F-3•DEL] [F-4•SPACE] [F-5•Ω≈] 4 RECEIVE AND TRANSMIT • RTTY memory edit screen Key selection Editable characters A to Z (capital letters) a to z (small letters) (selectable for memory name only) 0 to 9 (numbers) ! # $ % & ¥ ? “ ‘ ` ^ + – ✱/ . , : ; = < > ( ) [ ] { } | _ ~ @ (For the memory contents set- ting, ! $ & ? “ ‘ – / . , : ; ( ) ↵are selectable.) CH Name Contents RT1 MYCALLx2 ↵DE ICOM ICOM K↵ RT2 MYCALLx3 ↵DE ICOM ICOM ICOM K↵ RT3 QSLUR599 ↵QSL UR 599–599 BK↵ RT4 DE+UR599 ↵QSL DE ICOM ICOM UR 599–599 BK↵ RT5 73 GL SK ↵73 GL SK↵ RT6 CQ CQ CQ ↵CQ CQ CQ DE ICOM ICOM ICOM K↵ RT7 RIG&ANT ↵MY TRANSCEIVER IS IC–7800 & ANTENNA IS A 3–ELEMENT TRIBAND YAGI.↵ RT8 EQUIP. ↵MY RTTY EQUIPMENT IS INTERNAL FSK UNIT & DEMODULATOR OF THE IC–7800.↵ • Pre-programmed contents

This set mode is used to set the decode USOS func- tion, time stamp setting, etc. • Setting contents q During RTTY mode operation, push [F-3•DECODE] to select RTTY decode screen. w Push [F-1•] to select RTTY decode menu 2, then push [F-6•SET] to select RTTY decode set mode. • Push [F-7•WIDE] to toggle the screen size from normal and wide. e Push [F-1•Y] or [F-2•Z] to select the desired set item. r Set the desired condition using the main dial. • Push [F-4•DEF] for 1 sec. to select a default condition or value. • Push [F-3•Ω≈] to select the set contents for some items. t Push [EXIT/SET] to exit from set mode. [F-1•Y] Main dial [EXIT/SET] [F-2•Z][F-4•DEF] [F-3•Ω ≈] [F-7•WIDE] 4 RECEIVE AND TRANSMIT • RTTY decode set mode screen Turn the letter code decoding after receiving a “space” (USOS; UnShift On Space function) capability ON and OFF. • ON : Decode as letter code. • OFF : Decode as character code. Selects the new line code of the internal RTTY de- coder. CR: Carriage Return, LF: Line Feed • CR,LF,CR;LF : Makes new line with any codes. • CR+LF : Makes new line with CR+LF code only. Selects the diddle condition. • BLANK : Transmits blank code during no code transmission. • LTRS : Transmits letter code during no code transmission. • OFF : Turns the diddle function OFF. Set the FFT scope waveform averaging function from 2 to 4 and OFF. (default: OFF) Recommendation! If you use the FFT scope waveform for tuning, use the default or smaller number setting is recommended. Set the color for the FFT scope waveform. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255.

4 RECEIVE AND TRANSMIT Explicitly inserts the FIGS character even thought it is not required by the receiving station. • ON : Inserts FIGS. • OFF : Does not insert FIGS. Turn the time stamp (date, transmission or reception time) indication ON and OFF. • ON : Displays the time stamp. • OFF : No time stamp indication. Selects the clock indication for time stamp usage. NOTE: The time won’t be displayed when “OFF” is selected in “RTTY Time Stamp” as above. • Local : Selects the time that set in “Time (Now).” • UTC* : Selects the time that set in “CLOCK2.” *The name of choice may differ according to “CLOCK2 Name” setting (p, 11-2). “UTC” is the default name of CLOCK2. Selects the automatic new line code (CR+LF) trans- mission capability. • ON : Transmits CR+LF code once. • OFF : Transmits no CR+LF code. Set the text color for transmitted characters. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Selects the operating frequency indication for time stamp usage. NOTE: The frequency won’t be displayed when “OFF” is selected in “RTTY Time Stamp” as above. • ON : Displays the operating frequency. • OFF : No operating frequency display. Set the text color for received characters. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Set the text color for time stamp indication. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Set the text color in the TX buffer screen. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255.

The contents of the RTTY memory and received sig- nal can be saved into the CF memory card. q During RTTY decode screen indication, push [F-1•] to select RTTY decode menu 2. w Push [F-5•SAVE] to select decode file save screen. e Change the following conditions if desired. • File name: z Push [F-4•EDIT] to select file name edit con- dition. • Push [F-1• DIR/FILE] several times to select the file name, if necessary. x Push [ABC], [123] or [Symbol] to select the character group, then rotate the main dial to select the character. • [ABC] : A to Z (capital letters); [123]: 0 to 9 (nu- merals); [Symbol]: ! # $ % & ‘ ` ^ + – = ( ) [ ] { } _ ~ @ can be selected. • Push [F-1•Ω] to move the cursor left, push [F-2•≈] to move the cursor right, [F-3•DEL] delete a char- acter and push [F-4•SPACE] to insert a space. c Push [EXIT/SET] to set the file name. • File format z Push [F-5•OPTION] to enter save option screen. x Rotate the main dial to select the saving for- mat from Text to HTML. • “Text” is the default setting. • Push [F-4•DEF] for 1 sec. to select the default set- ting. c Push [EXIT/SET] to return to the previous in- dication. • Saving location z Push [F-1•DIR/FILE] to select tree view screen. x Select the desired directory or folder in the CF memory card. • Push [F-4•Ω≈] to select the upper directory. • Push [F-2•Y] or [F-3•Z] to select folder in the same directory. • Push [F-4•Ω≈] for 1 sec. to select a folder in the directory. • Push [F-5•REN/DEL] to rename the folder. • Push [F-5•REN/DEL] for 1 sec. to delete the folder. • Push [F-6•MAKE] for 1 sec. to making a new folder. (Edit the name with the same manner as the “• File name” above.) c Push [F-1•DIR/FILE] twice to select the file name. r Push [F-6•SAVE]. • After the saving is completed, returns to RTTY decode menu 2 automatically. [F-1•DIR/FILE] Main dial [EXIT/SET] [F-4•EDIT] [F-5•OPTION] [F-6•SAVE] [F-7•WIDE] 4 RECEIVE AND TRANSMIT • Decode file save screen • Decode file save screen— file name edit • Save option screen ✔For your convenience! Two formats, Text and HTML, are available for storage of data to your PC.

A high-quality DSP-based PSK31 encoder/decoder is built-in to the IC-7800. When connecting a PC key- board (p. 2-6), PSK31 operation can be performed without PSK software installed on your PC. If desired, you can also use your PSK software; con- sult the manual that comes with the software. q Push a band key to select the desired band. w Push [RTTY/PSK] to select PSK. • After PSK mode is selected, push [RTTY/PSK] for 1 sec. to toggle between PSK and PSK-R modes. • “PSK” or “PSK-R” appears. e Push [F-3•DECODE] to displays the decoder screen. • The IC-7800 has a built-in PSK31 decoder. r Tune the desired signal with the main dial. • The signal is properly tuned when the radiated lines in the vector tuning indicator narrow, as show in the exam- ple below. • The radiated lines in the vector tuning indicator may be displayed sporadically. • When a PSK signal is received, the water-fall display is activated. • The water-fall display shows the signal condition within the passband and a vertical line appears when a PSK signal is received. t Press [F12] of the connected keyboard to transmit. • [TX] indicator lights red. y Type from the connected keyboard to enter the message that you want to transmit. • The typewritten contents are indicated in the TX buffer screen and transmitted immediately. • The text color will be changed when transmitted. • Press one of [F1]–[F8] to transmit the TX memory con- tents. u Press [F12] of the keyboard to return to receive. ✔For your convenience The transmission contents can be typed before being transmitted. q Perform the steps q to r above. w Type from the connected keyboard to enter the message that you want to transmit. • The message is shown in the TX buffer screen. e Press [F12] of the connected keyboard to transmit the message. • The color of displayed text, in the TX buffer screen, will be changed when transmitted. • To cancel the transmission, press [F12] twice. r Press [F12] of the keyboard to return to receive. FFT scope Vector tuning indicator TX buffer screen RX contents screen Water-fall Appears [TX] indicator [RX] indicator [F-3•DECODE] [RTTY/PSK] [AF] Main dial Band keys 4 RECEIVE AND TRANSMIT • Vector tuning indicator indication example Tuned BPSK signal BPSK/QPSK idle signal Unmodulated signal Tuned QPSK signal

D About BPSK and QPSK mode BPSK and QPSK modes are available for PSK31. • BPSK (Binary Phase Shift Keying) mode is the most commonly used mode. • QPSK (Quadrature Phase Shift Keying) mode has error correction capability to provide better decoding than BPSK mode in marginal condition. However, more accurate tuning is required with QPSK mode, due to the tight phase margin of QPSK. q During PSK mode selection, push [F-3•DECODE] to display the PSK decode screen. w Push [F-1•] to select PSK decode menu 2. e Push [F-2•B/QPSK] to toggle between BPSK and QPSK mode alternately. [F-3•DECODE] [F-2•B/QPSK] [F-1•] • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON. Main and sub have independent preamp controls. • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. • Noise blanker (p. 5-17) ➥Push [NB] switch to turn the noise blanker ON and OFF, and then rotate [NB] control to adjust the threshold level. • Noise blanker indicator (above [NB] switch) lights when the noise blanker is ON. • Push [NB] for 1 sec. to enter noise blanker set mode. • Twin PBT (passband tuning) (p. 5-12) ➥Rotate [TWIN PBT] controls (inner/outer). • Push [PBT CLEAR] to clear the settings. • Noise reduction (p. 5-18) ➥Push [NR] switch to turn the noise reduction ON and OFF. • Rotate [NR] control to adjust the noise reduction level. • Noise reduction indicator (above [NR] switch) lights when the noise reduction is ON. • AGC (auto gain control) (p. 5-11) ➥Push [AGC] switch several times to select AGC FAST, AGC MID or AGC SLOW. ➥Push [AGC VR] to turn the AGC time constant manual setting ON and OFF. • Rotate [AGC] control to adjust the time constant. • Fine tuning (p. 3-7) ➥During PSK, make sure that the kHz tuning step function is OFF (no “Z” indication), push [TS] for 1 sec. • PSK may not be decoded correctly using the 10 Hz step tuning. • 1⁄4 function (p. 3-6) ➥Push [1/4] to turn the 1⁄4 function ON and OFF. 4 RECEIVE AND TRANSMIT • PSK decode screen— BPSK mode • PSK decode screen— QPSK mode

q Push a band key to select the desired band. w Push [RTTY/PSK] to select PSK. • After PSK mode is selected, push [RTTY/PSK] for 1 sec. to toggle between PSK and PSK-R modes. • “PSK” or “PSK-R” appears. e Push [F-3•DECODE] to display the decoder screen. • When tuned into a PSK signal, decoded characters are displayed in the RX contents screen. r Push [F-2•HOLD/CLR] to freeze the current screen. • “ ” appears while the function is in use. • Push [F-2•HOLD/CLR] again to release the function. t Push [F-2•HOLD/CLR] for 1 sec. to clear the dis- played characters. • “ ” indicator disappears at the same time when the hold function is in use. y Push [F-3•AFC/NET] to turn the AFC function ON. • “ ” appears. • If a PSK signal is received within the AFC tuning range, the decoder automatically tunes into the signal and the offset frequency is displayed. • The AFC tuning range is set to ±15 Hz as the default. Optional ±8 Hz setting is available in PSK decode set mode. (p. 2) u Push [F-3•AFC/NET] again to turn the NET function ON. • “ ” appears additionally. i Push [F-3•AFC/NET] for 1 sec. to add the offset fre- quency to the displayed frequency. o Push [F-7•WIDE] to toggle the PSK decode screen size from normal and wide. • S/RF meter type during wide screen indication can be selected in display set mode. (pgs. 3-11, 12-11) !0 Push [F-6•MAIN/SUB] to toggle the MAIN and SUB band for decode operation. • Dualwatch function (p. 5-16) should be ON when SUB band is selected for decode operation. !1 Push [EXIT/SET] to close the PSK decode screen. D Setting the decoder threshold level Adjust the PSK decoder threshold level if some char- acters are displayed when no signal is received. q Call up the PSK decoder screen as described above. w Push [F-5•ADJ] to select the threshold level setting condition. e Rotate the main dial to adjust the PSK decoder threshold level. • Push [F-6•DEF] for 1 sec. to select the default setting. r Push [F-5•ADJ] to exit from the threshold level set- ting condition. NOTE: The AFC function may not tune the signal properly when a weak PSK signal is received. • AFC/NET indications “AFC” and “NET” indicators Offset frequency HOLD HOLD [F-3•AFC/NET] [F-6•MAIN/SUB] [F-7•WIDE] [F-2•HOLD/CLR] [RTTY/PSK] [EXIT/SET] 4 RECEIVE AND TRANSMIT

Pre-set characters can be sent using the PSK memo- ry. Contents of the memory are set using the edit menu. q During PSK mode operation, push [F-3•DECODE] to select PSK decode screen. w Push [F-4•TX MEM] to select PSK memory screen. e Push [F-7•1–4/5–8] to select memory bank then push one of the function keys ([F-1•PT1] to [F-4•PT4] or [F-1•PT5] to [F-4•PT8]). • When no keyboard is connected, the selected memory contents will be transmitted immediately. • When a keyboard is connected, the memory contents will be transmitted immediately when function key is pushed, or transmitted after [F12] on the connected key- board is pressed, depending on auto transmission/re- ception setting (see below). • The transmission date, time, reception date and/or time may be displayed in RX contents screen, depending on setting. D Automatic transmission/reception setting q During PSK mode operation, push [F-3•DECODE] to select PSK decode screen. w Push [F-4•TX MEM] to select PSK memory screen, then push [F-6•EDIT] to select PSK memory edit screen. • PSK memory contents of Channel 1 (PT1) is selected. e Push [F-7•PT1..PT8] several times to select the de- sired RTTY memory. r Push [F-6•AUTO TX] several times to select the de- sired condition, as follows. • AUTO TX/RX : Automatically transmits the se- lected memory and returns to re- ceive after the transmission. • AUTO TX : Automatically transmits the se- lected memory. To return to re- ceive, press [F12] on the key- board. • AUTO RX : Press [F12] on the keyboard to transmit the selected memory. Au- tomatically returns to receive after the transmission. • No indication : Press [F12] on the keyboard to transmit the selected memory and press [F12] again to return to re- ceive. t Push [EXIT/SET] to return to exit from PSK mem- ory edit condition. NOTE: The transceiver always functions as the “AUTO TX/RX” setting when no keyboard is con- nected. [F-6•AUTO TX] [F-7•PT1..PT8] [EXIT/SET] [F-7•1–4/5–8] [F-1•PT1]–[F-4•PT4] [F-1•PT5]–[F-4•PT8] [EXIT/SET] 4 RECEIVE AND TRANSMIT

The contents of the PSK memories can be set using the memory edit menu. The memory can store 8 PSK messages for often-used PSK information. Total capacity of the memory is 70 characters per memory channel. • Programming contents q During PSK mode operation, push [F-3•DECODE] to select PSK decode screen. w Push [F-4•TX MEM] to select PSK memory screen, then push [F-6•EDIT] to select PSK memory edit screen. • PSK memory contents of the Channel 1 (PT1) is se- lected. e Push [F-7•PT1..PT8] several times to select the de- sired PSK memory channel to be edited. r Push [F-5•Ω≈] to select the edit item between memory contents and memory name. t Push [ABC], [abc], [123] or [Symbol] to select the character group, then rotate the main dial to select the character, or push the keypad for number input. • [abc] appears when [ABC] is pushed when “ABC” char- acter group is selected, and [Symbol] appears when [123] is pushed when “123” character group is selected. • Selectable characters (with the main dial); ✔For your convenience When a PC keyboard is connected to [KEYBOARD] connector on the rear panel, the PSK memory con- tents can also be edited from the keyboard. y Push [F-1•Ω] or [F-2•≈] to move the cursor back- wards or forwards, respectively. • Pushing [F-3•DEL] deletes a character and [F-4•SPACE] inserts a space. u Repeat steps t and y to input the desired charac- ters. i Push [EXIT/SET] to set the contents and exit PSK memory edit screen. [F-1•Ω] [ABC]/[abc] [123]/[Symbol] [F-7•PT1..PT8] [EXIT/SET] [F-2•≈] [F-3•DEL] [F-4•SPACE] [F-5•Ω≈] 4 RECEIVE AND TRANSMIT Key selection Editable characters A to Z (capital letters) a to z (small letters) 0 to 9 (numbers) ! # $ % & ¥ ? “ ‘ ` ^ + – ✱/ . , : ; = < > ( ) [ ] { } | _ ~ @ ↵ (“↵” is for the memory contents set- ting only.) CH Name Contents PT1 MYCALLx2 ↵DE Icom Icom K↵ PT2 MYCALLx3 ↵DE Icom Icom Icom K↵ PT3 QSLUR599 ↵QSL UR 599 599 BK↵ PT4 DE+UR599 ↵QSL DE Icom Icom UR 599 599 BK↵ PT5 73 GL SK ↵73 GL SK↵ PT6 CQ CQ CQ ↵CQ CQ CQ DE Icom Icom Icom K↵ PT7 RIG&ANT ↵My transceiver is IC–7800 & Antenna is a 3–element triband yagi.↵ PT8 EQUIP. ↵My PSK equipment is internal modulator & demodulator of the IC–7800.↵ • Pre-programmed contents • PSK memory edit screen

This set mode is used to set the decode USOS func- tion, time stamp setting, etc. • Setting contents q During PSK mode operation, push [F-3•DECODE] to select PSK decode screen. w Push [F-1•] to select PSK decode menu 2, then push [F-6•SET] to select PSK decode set mode. • Push [F-7•WIDE] to toggle the screen size from normal and wide. e Push [F-1•Y] or [F-2•Z] to select the desired set item. r Set the desired condition using the main dial. • Push [F-4•DEF] for 1 sec. to select a default condition or value. • Push [F-3•Ω≈] to select the set contents for some items. t Push [EXIT/SET] to exit from set mode. [F-1•Y] Main dial [EXIT/SET] [F-2•Z][F-4•DEF] [F-3•Ω ≈] [F-7•WIDE] 4 RECEIVE AND TRANSMIT Turn the time stamp (date, transmission or reception time) display ON and OFF. • ON : Displays the time stamp. • OFF : No time stamp display. Selects the clock display for time stamp usage. NOTE: The time won’t be displayed when “OFF” is selected in “PSK Time Stamp” as above. • Local : Selects the time that set in “Time (Now).” • UTC* : Selects the time that set in “CLOCK2.” *The name of choice may differ according to “CLOCK2 Name” setting (p, 11-2). “UTC” is the default name of CLOCK2. Set the FFT scope waveform averaging function from 2 to 4 and OFF. (default: OFF) Recommendation! If you use the FFT scope waveform for tuning, using the default or smaller number setting is recom- mended. Set the color for the FFT scope waveform. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Select the AFC (Automatic Frequency Control) func- tion operating range from ±15 Hz (default) and ±8 Hz. NOTE: The AFC function may not tune the signal properly when a weak PSK signal is received.

4 RECEIVE AND TRANSMIT Selects the operating frequency display for time stamp usage. NOTE: The frequency won’t be displayed when “OFF” is selected in “PSK Time Stamp” as below left. • ON : Displays the operating frequency. • OFF : No operating frequency display. Set the text color for received characters. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Set the text color for transmitted characters. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Set the text color for time stamp indication. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255. Set the text color in the TX buffer screen. • The color is set in RGB format. • The set color is indicated in the box beside the RGB scale. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and then rotate the main dial to set the ratio from 0 to 255.

The contents of the PSK memory and received signal can be saved into the CF memory card. q During PSK decode screen indication, push [F-1•] to select PSK decode menu 2. w Push [F-5•SAVE] to select decode file save screen. e Change the following conditions if desired. • File name: z Push [F-4•EDIT] to select file name edit con- dition. • Push [F-1• DIR/FILE] several times to select the file name, if necessary. x Push [ABC], [123] or [Symbol] to select the character group, then rotate the main dial to select the character. • [ABC] : A to Z (capital letters); [123]: 0 to 9 (nu- merals); [Symbol]: ! # $ % & ‘ ` ^ + – = ( ) [ ] { } _ ~ @ can be selected. • Push [F-1•Ω] to move the cursor left, push [F-2•≈] to move the cursor right, [F-3•DEL] delete a char- acter and push [F-4•SPACE] to insert a space. c Push [EXIT/SET] to set the file name. • File format z Push [F-5•OPTION] to enter save option screen. x Rotate the main dial to select the saving for- mat from Text and HTML. • “Text” is the default setting. • Push [F-4•DEF] for 1 sec. to select the default set- ting. c Push [EXIT/SET] to return to the previous in- dication. • Saving location z Push [F-1•DIR/FILE] to select tree view screen. x Select the desired directory or folder in the CF memory card. • Push [F-4•Ω≈] to select the upper directory. • Push [F-2•Y] or [F-3•Z] to select folder in the same directory. • Push [F-4•Ω≈] for 1 sec. to select a folder in the directory. • Push [F-5•REN/DEL] to rename the folder. • Push [F-5•REN/DEL] for 1 sec. to delete the folder. • Push [F-6•MAKE] for 1 sec. to make a new folder. (Edit the name with the same manner as the “• File name” above.) c Push [F-1•DIR/FILE] twice to select the file name. r Push [F-6•SAVE]. • After the saving is completed, return to PSK decode menu 2 automatically. [F-1•DIR/FILE] Main dial [EXIT/SET] [F-4•EDIT] [F-5•OPTION] [F-6•SAVE] [F-7•WIDE] 4 RECEIVE AND TRANSMIT • Decode file save screen • Decode file save screen— file name edit • Save option screen ✔For your convenience! Two data formats, Text and HTML, are available for PC data storage.

q Push a band key to select the desired band. w Push [AM/FM] to select AM. • “AM” indicator appears. • After AM mode is selected, push [AM/FM] to toggle be- tween AM and FM modes. e Rotate the main dial to tune the desired frequency. • The S-meter indicates received signal strength when signal is received. r Rotate [AF] to set audio to a comfortable listening level. t Push [TRANSMIT] or [PTT] (microphone) to trans- mit. • The TX indicator lights red. y Speak into the microphone at your normal voice level. • Adjust the microphone gain with [MIC] at this step, if necessary. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive. D Convenient functions for receive • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON. Main and sub have independent preamp controls. • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. • Noise blanker (p. 5-17) ➥Push [NB] switch to turn the noise blanker ON and OFF, and then rotate [NB] control to adjust the threshold level. • Noise blanker indicator (above [NB] switch) lights when the noise blanker is ON. • Push [NB] for 1 sec. to enter noise blanker set mode. • Noise reduction (p. 5-18) ➥Push [NR] switch to turn the noise reduction ON and OFF. • Rotate [NR] control to adjust the noise reduction level. • Noise reduction indicator (above [NR] switch) lights when the noise reduction is ON. • Twin PBT (passband tuning) (p. 5-12) ➥Rotate [TWIN PBT] controls (inner/outer). • Push [PBT CLEAR] to clear the settings. • Notch filter (p. 5-19) ➥Push [NOTCH] switch to turn the manual notch function ON and OFF. • Rotate [NOTCH] control to set the attenuating fre- quency. • Notch indicator (above [NOTCH] switch) lights when either the manual notch is ON. • AGC (auto gain control) (p. 5-11) ➥Push [AGC] switch several times to select AGC FAST, AGC MID or AGC SLOW. ➥Push [AGC VR] to turn the AGC time constant manual setting ON and OFF. • Rotate [AGC] control to adjust the time constant. • Auto tuning function (p. 1-9) ➥Push [AUTO TUNE] to turn the auto tuning func- tion ON and OFF. • The transceiver automatically tunes the desired sig- nal within ±5 kHz range. IMPORTANT! When receiving a weak signal, or receiving a signal with interference, the automatic tuning function may not tune, or may tune to an undesired signal. Appears [TX] indicator [MIC] [RX] indicator [AM/FM] [AF] Main dial Band keys 4 RECEIVE AND TRANSMIT

• VOX (voice operated transmit) (p. 6-2) ➥Push [VOX/BK-IN] to turn the VOX function ON and OFF. • “VOX” appears when the VOX function is ON. • Transmit quality monitor (p. 6-4) ➥Push [MONI] to turn the monitor function ON and OFF. • Rotate [MONI GAIN] to adjust the monitor gain. • Monitor indicator (above [MONI] switch) lights when the monitor function is ON. • Audio tone control (p. 12-4) ➥Push [F-7•SET] then [F-1•LEVEL] to enter level set mode. Select an item with [F-1•Y]/[F-2•Z] then rotate the main dial to adjust the audio tone. 4 RECEIVE AND TRANSMIT

q Push a band key to select the desired band. w Push [AM/FM] to select FM. • “FM” indicator appears. • After FM mode is selected, push [AM/FM] to toggle be- tween FM and AM modes. e Rotate the main dial to tune the desired frequency. • The S-meter indicates received signal strength when signal is received. • 10 kHz tuning step is preset for the FM mode. • Push [FILTER] several times to select the desired filter width. r Rotate [AF] to set audio to a comfortable listening level. t Push [TRANSMIT] or [PTT] (microphone) to trans- mit. • The TX indicator lights red. y Speak into the microphone at your normal voice level. • Adjust the microphone gain with [MIC] at this step, if necessary. • FM narrow transmission is available when “FIL2” or “FIL3” is selected. u Push [TRANSMIT] or release [PTT] (microphone) to return to receive. D Convenient functions for receive D Convenient functions for transmit • VOX (voice operated transmit) (p. 6-2) ➥Push [VOX/BK-IN] to turn the VOX function ON and OFF. • “VOX” appears when the VOX function is ON. • Transmit quality monitor (p. 6-4) ➥Push [MONI] to turn the monitor function ON and OFF. • Rotate [MONI GAIN] to adjust the monitor gain. • Monitor indicator (above [MONI] switch) lights when the monitor function is ON. • Audio tone control (p. 12-4) ➥Push [F-7•SET] then [F-1•LEVEL] to enter level set mode. Select an item with [F-1•Y]/[F-2•Z] then rotate the main dial to adjust the audio tone. • Preamp (p. 5-9) ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. • “P.AMP1” or “P.AMP2” appears when the preamp 1 or preamp 2 is ON. Main and sub have independent preamp controls. • Auto notch filter (p. 5-19) ➥Push [NOTCH] switch to turn the auto notch func- tion ON and OFF. • Notch indicator (above [NOTCH] switch) lights when either the manual notch is ON. • Attenuator (p. 5-9) ➥Push [ATT] several times to set the attenuator in 6 dB steps. • Pushing [ATT] for 1 sec. to set the attenuator in 3 dB steps. • “ATT” and attenuation level appear when the attenu- ator is ON. Appears [TX] indicator [MIC] [RX] indicator [AM/FM] [AF] Main dial Band keys [FILTER] 4 RECEIVE AND TRANSMIT

A repeater amplifies received signals and retransmits them at a different frequency. When using a repeater, the transmit frequency is shifted from the receive fre- quency by an offset frequency. A repeater can be ac- cessed using split frequency operation with the shift frequency set to the repeater’s offset frequency. For accessing a repeater which requires a repeater tone, set the repeater tone frequency in tone fre- quency set mode as described below. q Set the offset frequencies (HF, 50 MHz) and turn ON the quick split function in miscellaneous (others) set mode in advance. (p. 12-15) w Push [V/M] to select VFO mode. e Push the desired band key. r Push [AM/FM] several times to select FM mode. t Set the receive frequency (repeater output fre- quency). y Push [SPLIT] for 1 sec. to start repeater operation. • Repeater tone is turned ON automatically. • [SPLIT] indicator lights and “ ” appears on the LCD. • Shifted transmit frequency and “TX” appear in the sub band. • The transmit frequency can be monitored while pushing [XFC] or using dualwatch. u Push and hold [PTT] to transmit; release [PTT] to receive. i To return to simplex, push [SPLIT] momentarily. D Repeater tone frequency setting Some repeaters require subaudible tones to be ac- cessed. Subaudible tones are superimposed over your normal signal and must be set in advance. The trans- ceiver has 50 tones from 67.0 Hz to 254.1 Hz. q Select FM mode. w Push [TONE] for 1 sec. to tone frequency set mode. e Push [F-1•Y] or [F-2•Z] to select REPEATER TONE item. r Rotate the main dial to select the desired repeater tone frequency. • Push [F-4•DEF] for 1 sec. to select the default setting. t Push [EXIT/SET] to return to the previous indica- tion. • Available tone frequencies (unit: Hz) [AM/FM] [F-1•Y] [F-2•Z] Main dial [F-4•DEF] [TONE] [V/M] [AM/FM] [XFC] [SPLIT] Main dial Band keys [SPLIT] indicator 4 RECEIVE AND TRANSMIT 67.0 69.3 71.9 74.4 77.0 79.7 82.5 085.4 088.5 091.5 094.8 097.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1

The tone squelch opens only when receiving a signal containing a matching subaudible tone. You can silently wait for calls from group members using the same tone. q Set the desired frequency band and select FM mode. w Push [TONE] to turn the tone squelch function ON. • “TSQL” appears e Push [TONE] for 1 sec. to tone frequency set mode. r Push [F-1•Y] or [F-2•Z] to select T-SQL TONE item. t Rotate the main dial to select the desired tone squelch frequency. • Push [F-4•DEF] for 1 sec. to select the default setting. y Push [EXIT/SET] to return to the previous indica- tion. u When the received signal includes a matching tone, squelch opens and the signal can be heard. • When the received signal’s tone does not match, tone squelch does not open, however, the S-indicator shows signal strength. • To open the squelch manually, push [XFC]. i Operate the transceiver in the normal way. o To cancel the tone squelch, push [TONE] to clear “TSQL.” • Available tone frequencies (unit: Hz) [AM/FM] [F-1•Y] [F-2•Z] Main dial [F-4•DEF] [TONE] 4 RECEIVE AND TRANSMIT 67.0 69.3 71.9 74.4 77.0 79.7 82.5 085.4 088.5 091.5 094.8 097.4 100.0 103.5 107.2 110.9 114.8 118.8 123.0 127.3 131.8 136.5 141.3 146.2 151.4 156.7 159.8 162.2 165.5 167.9 171.3 173.8 177.3 179.9 183.5 186.2 189.9 192.8 196.6 199.5 203.5 206.5 210.7 218.1 225.7 229.1 233.6 241.8 250.3 254.1

When operating AMTOR or PACKET with your TNC and/or PC software, consult the manual that comes with the TNC and/or the software. q Connect a PC and TNC to the transceiver. (p. 2-8) w Push a band key to select the desired band. e Push [SSB] or [AM/FM] to select the desired oper- ating mode. r Push [DATA] to turn data mode ON. • One of “-D1,” “-D2” or “-D3” is additionally appears. • During data mode selection, pushing [DATA] for 1 sec. to select data mode 1 (D1), 2 (D2) and 3 (D3) in se- quence. t Rotate the main dial to tune into the desired signal and decoded correctly. • Also use the tuning indicator of the TNC or software. • During SSB data mode, 1⁄4 tuning function can be used for critical tuning. y Operate the PC (software) or TNC to transmit. • When operating in SSB data mode, adjust the TNC out- put level so that the ALC meter reading doesn’t go out- side the ALC zone. NOTE: When SSB data mode is selected, the audio input from the [ACC1] (pin 6) is used for transmis- sion instead of [MIC]’s. The fixed condition is used for SSB data transmis- sion as follows: • [COMP] : OFF • Tx bandwidth : MID • Tx Tone (Bass) : 0 • Tx Tone (Trebles): 0 ✔For your information Carrier frequency is displayed when SSB data mode is selected. See the diagram left for the tone-pair example. 200 Hz 2125 Hz 2325 Hz Carrier frequency (displayed frequency) Appears [AM/FM] [SSB] [AF] [DATA] Main dial Band keys 4 RECEIVE AND TRANSMIT

Section 5 I Spectrum scope screen ……………………………………………… 5-2 D Center mode ………………………………………………………… 5-2 D Fix mode ……………………………………………………………… 5-3 D Mini scope screen indication ……………………………………… 5-4 D Scope set mode ……………………………………………………… 5-4 I Preamplifier ……………………………………………………………… 5-9 I Attenuator ……………………………………………………………… 5-9 I RIT function …………………………………………………………… 5-10 D RIT monitor function …………………………………………………5-10 I AGC function …………………………………………………………… 5-11 D Selecting the preset value …………………………………………5-11 D Adjusting the AGC time constant …………………………………5-11 D Setting the AGC time constant preset value ………………………5-11 I Twin PBT operation …………………………………………………… 5-12 I IF filter selection ……………………………………………………… 5-13 D IF filter selection …………………………………………………… 5-13 D Filter passband width setting (except FM mode) ……………… 5-13 D Roofing filter selection ……………………………………………… 5-14 D DSP filter shape …………………………………………………… 5-14 D Filter shape set mode ……………………………………………… 5-14 I Dualwatch operation ………………………………………………… 5-16 I Noise blanker ………………………………………………………… 5-17 D NB set mode ………………………………………………………… 5-17 I Noise reduction ………………………………………………………… 5-18 I Dial lock function ……………………………………………………… 5-18 I Notch function ………………………………………………………… 5-19 I Digital selector ………………………………………………………… 5-19

This DSP-based spectrum scope allows you to display the conditions on the selected band, as well as relative strengths of signals. The IC-7800 has two modes for the spectrum indication— one is center mode, and an- ther one is fix mode. In addition, the IC-7800 has a mini scope screen to save screen space. D Center mode Displays signals around the set frequency within the selected span. The set frequency is always displayed at the center of the screen. q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Push [F-1•SCOPE] to select the scope screen. e Push [F-5•CENT/FIX] to select the center mode. • “ ” is displayed when center mode is selected. r Push [F-1•SPAN] several times to select the scope span. • ±2.5, ±5.0, ±10, ±25, ±50, ±100 and ±250 kHz are avail- able. • Sweeping speed is selectable for each span indepen- dently in scope set mode. (pgs. 5-5, 5-6) t Push [F-2•ATT] several times to activate an attenu- ator or turn the attenuator OFF. • 10, 20 and 30 dB attenuators are available. y Push [F-6•MAIN/SUB] to select main band. • The spectrum scope with sub band selection is activated during dualwatch or split frequency operation only. u Push [F-3•MARKER] several times to select the marker (sub readout or transmit frequency) or turn the marker OFF. • “ ” displays the marker at the transmit frequency. • “ ” displays the marker at the sub readout frequency. • “<<” or “>>” appears when the marker is out of range. • The spectrum scope shows the transmit signal wave- form while transmitting. This can be deactivated in scope set mode. (p. 5-4) • The spectrum scope shows the peak level holding func- tion. Peak levels are displayed in the background of the current spectrum in a different color until the receive fre- quency changes. This can be deactivated and the wave- form color can be set in scope set mode. (p. 5-5) i Push [F-4•HOLD] to freeze the current spectrum waveform. • “ ” appears while the function is in use. • The peak hold function can be deactivated in scope set mode. o Push [EXIT/SET] to exit the scope screen. NOTE: If a strong signal is received, a ghost wave- form may appear. Push [F-2•ATT] several times to activate the spectrum scope attenuator in this case. Spurious signal waveforms may be displayed. They are generated in the internal scope circuit and do not indicate a transceiver malfunction. HOLD [F-3•MARKER] [F-2•ATT] [F-1•SPAN] [EXIT/SET] [F-5•CENT/FIX] [F-4•HOLD] [F-6•MAIN/SUB] 5 FUNCTIONS FOR RECEIVE • Observed indication example

Displays signals within the specified frequency range. The selected frequency band conditions can be ob- served at a glance when using this mode. q Push [EXIT/SET] several times to close a multi- function screen, if necessary. w Push [F-1•SCOPE] to select the scope screen. e Push [F-5•CENT/FIX] to select the fix mode. • “ ” is displayed when fix mode is selected. r Push [F-2•ATT] several times to activate an attenu- ator or turn the attenuator OFF. • 10, 20 and 30 dB attenuators are available. t Push [F-6•MAIN/SUB] to select main band. • The spectrum scope with sub band selection is activated during dualwatch or split frequency operation only. y Push [F-3•MARKER] several times to select the marker (sub readout or transmit frequency) or turn the marker OFF. • “ ” displays the marker at the main readout frequency. (always displayed) • “ ” displays the marker at the transmit frequency. • “ ” displays the marker at the sub readout frequency. • “<<” or “>>” appears when the marker is out of range. • The spectrum scope shows the transmit signal wave- form while transmitting. This can be deactivated in scope set mode. (p. 5-4) • The spectrum scope shows the peak level holding func- tion. Peak levels are displayed in the background of the current spectrum in a different color until the receive fre- quency changes. This can be deactivated and the wave- form color can be set in scope set mode. (p. 5-5) u Push [F-4•HOLD] to freeze the current spectrum waveform. • “ ” appears while the function is in use. • The peak hold function can be deactivated in scope set mode. i Push [EXIT/SET] to exit the scope screen. NOTE: If a strong signal is received, a ghost wave- form may appear. Push [F-2•ATT] several times to activate the spectrum scope attenuator in this case. The scope bandwidth can be specified for each op- erating frequency band independently in scope set mode. (pgs. 5-6 to 5-8) HOLD [F-3•MARKER] [F-2•ATT] [EXIT/SET] [F-5•CENT/FIX] [F-4•HOLD] [F-6•MAIN/SUB] 5 FUNCTIONS FOR RECEIVE

The mini scope screen can be displayed with another screen display, such as set mode menu, decoder screen, memory list screen, etc. simultaneously. q Set the scope mode (center or fix), marker, attenu- ator, span, etc. in advance. (pgs. 5-2, 5-3) w Push [M.SCOPE] to toggle the mini scope indica- tion ON and OFF. • The S/RF meter type during mini scope indication can be selected in display set mode (Meter Type (Wide Screen) item). (p. 12-11) D Scope set mode This set mode is used to set the waveform color, sweeping speed, scope range for fix mode, etc. q During spectrum scope display ON, push [F-7•SET] to select scope set mode screen. • Push [F-7•WIDE] to toggle the screen size between nor- mal and wide. w Push [F-1•Y] or [F-2•Z] to select the desired set item. e Set the desired condition using the main dial. • Push [F-4•DEF] for 1 sec. to select the default condition or value. • Push [F-3•Ω≈] to select the set contents for some items. r Push [EXIT/SET] to exit from set mode. [F-1•Y] Main dial [EXIT/SET] [F-2•Z][F-4•DEF] [F-3•Ω ≈] [F-7•WIDE] [M.SCOPE] 5 FUNCTIONS FOR RECEIVE Turn the transmitting signal waveform indication ON and OFF. NOTE: The transmitting signal waveform indica- tion is available for the center mode only.

5 FUNCTIONS FOR RECEIVE Turn the peak level holding function ON and OFF. Select the center frequency of the spectrum scope indication (center mode only). • Filter center : Shows the selected filter’s center frequency at the center. • Carrier Point Center : Shows the selected operating mode carrier point frequency at the center. • Carrier Point Center (Abs. Freq.) : In addition to the carrier point center setting above, the actual frequency is displayed for the bottom of the scope. Set the waveform color for the currently received sig- nals. • The color is set in RGB format. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and rotate the ratio from 0 to 255 range. • The set color is indicated in the box beside the RGB scale. Set the waveform color for the receiving signals max- imum level. • The color is set in RGB format. • Push [F-3•Ω≈] to select R (Red), G (Green) and B (Blue), and rotate the ratio from 0 to 255 range. • The set color is indicated in the box beside the RGB scale. Select the sweeping speed for the ±2.5 kHz span selection from SLOW, MID and FAST. NOTE: The waveform may be displayed incorrect- ly with “FAST” setting. Select the sweeping speed for the ±5 kHz span selection from SLOW, MID and FAST. NOTE: The waveform may be displayed incorrect- ly with “FAST” setting. Select the sweeping speed for the ±10 kHz span selection from SLOW, MID and FAST. Select the sweeping speed for the ±25 kHz span selection from SLOW, MID and FAST.

5 FUNCTIONS FOR RECEIVE Select the sweeping speed for the ±50 kHz span selection from SLOW, MID and FAST. Select the sweeping speed for the ±100 kHz span selection from SLOW, MID and FAST. Select the sweeping speed for the ±250 kHz span selection from SLOW, MID and FAST. Set the scope edge frequencies for fix mode scope with below 1.6 MHz band selection. • Set the frequencies within 0.030 to 1.600 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 1.6 to 2 MHz band is selected. • Set the frequencies within 1.600 to 2.000 MHz range in 1 kHz steps. Set the scope edge frequencies for fix mode scope when 2 to 6 MHz band is selected. • Set the frequencies within 2.000 to 6.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 6 to 8 MHz band is selected. • Set the frequencies within 6.000 to 8.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency.

5 FUNCTIONS FOR RECEIVE Set the scope edge frequencies for fix mode scope when 8 to 11 MHz band is selected. • Set the frequencies within 8.000 to 11.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 11 to 15 MHz band is selected. • Set the frequencies within 11.000 to 15.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 15 to 20 MHz band is selected. • Set the frequencies within 15.000 to 20.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 20 to 22 MHz band is selected. • Set the frequencies within 20.000 to 22.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 22 to 26 MHz band is selected. • Set the frequencies within 22.000 to 26.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency.

5 FUNCTIONS FOR RECEIVE Set the scope edge frequencies for fix mode scope when 30 to 45 MHz band is selected. • Set the frequencies within 30.000 to 45.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 45 to 60 MHz band is selected. • Set the frequencies within 45.000 to 60.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency. Set the scope edge frequencies for fix mode scope when 26 to 30 MHz band is selected. • Set the frequencies within 26.000 to 30.000 MHz range in 1 kHz steps. Up to 500 kHz band width can be specified, so either edge frequency will be set to the differ- ence between higher and lower frequencies become 5 to 500 kHz automatically while setting another edge frequency.

front end, to improve the S/N ratio and sensitivity. Set this to preamp 1 or preamp 2 when receiving weak sig- nals. ➥Push [P.AMP] several times to set the preamp OFF, preamp 1 ON or preamp 2 ON. For all HF bands High-gain preamp for 24 MHz band and above ✔About the “P.AMP2” The “P.AMP 2” is a high gain receive amplifier. When the “P.AMP 2” is used during times of strong electric fields, distortion sometimes results. In such cases, use the transceiver with the “P.AMP 1” or “P.AMP OFF” set- ting. The “P.AMP 2” is most effective when: • Used on bands above 24 MHz and when electric fields are weak. • Receive sensitivity is insufficient during low gain, or while using a narrow band antenna (such as small loop, a Beverage antenna or a short Yagi antenna). I Attenuator The attenuator prevents a desired signal from distor- tion when very strong signals are near the desired fre- quency or when very strong electric fields, such as from broadcasting stations, are near your location. ➥Push [ATT] several times to set the attenuator 6 dB, 12 dB, 18 dB or attenuator OFF. ➥Push [ATT] for 1 sec. several times to set the atten- uator 3 dB, 6 dB, 9 dB, 12 dB, 15 dB, 18 dB, 21 dB or attenuator OFF. [ATT] [P.AMP] 5 FUNCTIONS FOR RECEIVE 3 dB attenuation 6 dB attenuation 9 dB attenuation 12 dB attenuation 15 dB attenuation 18 dB attenuation 21 dB attenuation

The RIT (Receive Increment Tuning) function com- pensates for off-frequencies of the communicating station. The function shifts the receive frequency up to ±9.99 kHz in 10 Hz steps without moving the transmit frequency. qPush [RIT] to turn the RIT function ON and OFF. • “ ” and the shifting frequency appear when the func- tion is ON. wRotate the [RIT/∂TX] control. • Push [CLEAR] for 1 sec. to reset the RIT frequency. • Push [CLEAR] momentarily to reset the RIT frequency when the quick RIT/∂TX clear function is ON. (p. 12-18) • Push [RIT] for 1 sec. to add the shift frequency to the op- erating frequency. D RIT monitor function When the RIT function is ON, pushing and holding [XFC] allows you to monitor the operating frequency directly (RIT is temporarily cancelled). ✔For your convenience— Calculate function The shift frequency of the RIT function can be added/subtracted to the displayed frequency. ➥While displaying the RIT shift frequency, push [RIT] for 1 sec. [XFC] [RIT] [RIT/∂TX] [CLEAR] 5 FUNCTIONS FOR RECEIVE

The AGC (auto gain control) controls receiver gain to produce a constant audio output level even when the received signal strength varies greatly. The transceiver has 3 preset AGC characteristics (time constant: fast, mid, slow) for non-FM mode. The FM mode AGC time constant is fixed as ‘FAST’ (0.1 sec.) and AGC time constant cannot be se- lected. D Selecting the preset value qSelect non-FM mode. wPush [AGC] several times to select AGC fast, AGC medium (MID) or AGC slow. • Push [AGC VR] for 1 sec. to turn the AGC function OFF. D Adjusting the AGC time constant qSelect non-FM mode. wPush [AGC VR], then rotate [AGC] control to adjust the AGC time constant. • [AGC VR] indicator above the switch lights green. D Setting the AGC time constant preset value qSelect the desired mode (not FM mode). wPush [AGC] for 1 sec. to enter AGC set mode. ePush [AGC] several times to select FAST time con- stant. rRotate the main dial to set the desired time constant for ‘AGC FAST.’ • AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode) or turned OFF. • Push [F-4•DEF] for 1 sec. to select a default value. tPush [AGC] to select medium time constant. yRotate the main dial to set the desired time constant for ‘AGC MID.’ • AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode) or turned OFF. • Push [F-4•DEF] for 1 sec. to select a default value. uPush [AGC] to select slow time constant. iRotate the main dial to set the desired time constant for ‘AGC SLOW.’ • AGC time constant can be set between 0.1 to 8.0 sec. (depends on mode) or turned OFF. • Push [F-4•DEF] for 1 sec. to select a default value. oSelect another mode (not FM). Repeat steps e to i if desired. !0Push [EXIT/SET] to exit the AGC set mode screen. [AGC] [AGC] control for main [AGC VR] for main [AGC VR] for sub [AGC] control for sub 5 FUNCTIONS FOR RECEIVE Mode Default Selectable AGC time constant 0.3 (FAST) 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, SSB 2.0 (MID) 2.5, 3.0, 4.0, 5.0, 6.0 6.0 (SLOW) 0.1 (FAST) 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, CW 0.5 (MID) 2.5, 3.0, 4.0, 5.0, 6.0 1.2 (SLOW) RTTY 0.1 (FAST) 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, PSK 0.5 (MID) 2.5, 3.0, 4.0, 5.0, 6.0 1.2 (SLOW) 3.0 (FAST) 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5, 3.0, AM 5.0 (MID) 4.0, 5.0, 6.0, 7.0, 8.0 7.0 (SLOW) FM 0.1 (FAST) Fixed • Selectable AGC time constant (unit: sec.)

In general PBT (Passband Tuning) electronically nar- rows the IF passband width by shifting the IF fre- quency to slightly outside of the IF filter passband to reject interference. The IC-7800 uses DSP for the PBT function. Moving both [TWIN PBT] controls to the same position shifts the IF. ➥The LCD shows the passband width and shift fre- quency graphically. ➥Push [FILTER] for 1 sec. to enter the filter set screen. Current passband width and shift frequency is displayed in the filter set screen. ➥To set the [TWIN PBT] controls to the center posi- tions, push [PBT CLR] for 1 sec. The variable range depends on the passband width and mode. The edge of the variable range is half of the passband width, and PBT is adjustable in 25 or 50 Hz steps. • [TWIN PBT] should normally be set to the center posi- tions (PBT setting is cleared) when there is no interfer- ence. • When PBT is used, the audio tone may be changed. • Not available for FM mode. • While rotating [TWIN PBT], noise may occur. This comes from the DSP unit and does not indicate an equipment malfunction. • PBT operation example IF center frequency Interference Desired signal Passband Both controls at center position Cutting a lower passband Cutting both higher and lower passbands Interference Interference Desired signal Passband PBT1 PBT2 PBT1 PBT2 PBT1 PBT2 Shows filter width, shifting value and condition [TWIN PBT] for main [PBT CLEAR] for main [PBT CLEAR] for sub [TWIN PBT] for sub 5 FUNCTIONS FOR RECEIVE

The transceiver has 3 passband width IF filters for each mode. For SSB, CW and PSK modes, the passband width can be set within 50 to 3600 Hz in 50 or 100 Hz steps. A total of 41 passband widths are available. For RTTY mode, the passband width can be set within 50 to 2700 Hz in 50 or 100 Hz steps. A total of 32 pass- band widths are available. For AM mode, the passband width can be set within 200 Hz to 10 kHz in 200 Hz steps. A total of 50 pass- band widths are available. For FM mode, the passband width is fixed and 3 pass- band widths are available. The filter selection is automatically memorized in each mode. The PBT shift frequencies are automatically memo- rized in each filter. D IF filter selection qSelect the desired mode. wPush [FILTER] several times to select the IF filter 1, 2 or 3. • The selected passband width and filter number is dis- played in the LCD. D Filter passband width setting (except FM mode) qPush [FILTER] for 1 sec. to enter filter set screen. wSelect any mode except FM. • Passband widths for FM modes are fixed and cannot be set. ePush [FILTER] several times to select the desired IF filter. rWhile pushing [F-1•BW], rotate the main dial to set the desired passband width. • In SSB, CW and PSK modes, the passband width can be set within the following range. 50 to 500 Hz 50 Hz steps 600 to 3600 Hz 100 Hz steps • In RTTY mode, the passband width can be set within the following range. 50 to 500 Hz 50 Hz steps 600 to 2700 Hz 100 Hz steps • In AM mode, the passband width can be set within the following range. 200 Hz to 10 kHz 200 Hz steps • Push [F-4•DEF] for 1 sec. to select the default value. tRepeat steps w to r if desired. yPush [EXIT/SET] to exit filter set screen. The PBT shift frequencies are cleared when the passband width is changed. This filter set screen graphically displays the PBT shift frequencies and CW pitch operations. [FILTER] for main [FILTER] for sub 5 FUNCTIONS FOR RECEIVE

The IC-7800 has 3, 6 and 15 kHz roofing filters at the 1st IF frequency. The roofing filter provides interfer- ence reduction from nearby strong signals. qPush [FILTER] for 1 sec. to enter filter set screen. wSelect any mode except FM. ePush [F-6•ROOFING] to select the desired filter width from 15 kHz (default), 6 kHz and 3 kHz. • Push [F-4•DEF] for 1 sec. to select a default value. rPush [EXIT•SET] to exit filter set screen. D DSP filter shape The type of DSP filter shape for each SSB, SSB data and CW can be selected independently from soft and sharp. qPush [FILTER] for 1 sec. to enter filter set screen. wSelect SSB, SSB data or CW mode. ePush [F-7•SHAPE] to select the desired filter shape from soft and sharp. rPush [EXIT•SET] to exit filter set screen. The filter shape can be set for each band (HF and 50 MHz bands), mode, as well as the passband width setting (CW only) independently as your default setting in filter shape set mode. D Filter shape set mode The type of DSP filter shape for each SSB, SSB data and CW can be selected independently from soft and sharp. qPush [FILTER] for 1 sec. to enter filter set screen. wPush [F-7•SHAPE] for 1 sec. to enter filter shape set mode. ePush [F-1•Y] or [F-2•Z] to select the desired item. rRotate the main dial to select the filter shape from soft and sharp. tPush [EXIT/SET] to exit filter shape set mode. 5 FUNCTIONS FOR RECEIVE Select the filter shape for SSB mode in HF bands. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider. Select the filter shape for SSB data mode in HF bands. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider.

5 FUNCTIONS FOR RECEIVE Select the filter shape for CW mode in HF bands. The set filter shape is automatically used only when the IF filter is set to 500 Hz or narrower. Select the filter shape for CW mode in HF bands. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider. Select the filter shape for SSB mode in 50 MHz band. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider. Select the filter shape for SSB data mode in 50 MHz band. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider. Select the filter shape for CW mode in 50 MHz band. The set filter shape is automatically used only when the IF filter is set to 500 Hz or narrower. Select the filter shape for CW mode in 50 MHz band. The set filter shape is automatically used only when the IF filter is set to 600 Hz or wider.

Dualwatch monitors 2 frequencies simultaneously. The IC-7800 has 2 independent receiver circuits so that you can use dualwatch with no compromises, even on different bands and modes. qSet the desired frequency and mode into the main band. wPush [DUALWATCH]. • “ ” appears. • Pushing [DUALWATCH] for 1 sec., the sub band is equalized at the same time. This quick dualwatch func- tion can be turned OFF in set mode. (p. 12-14) eRotate the sub dial to set the desired frequency. rPush [SUB] to enables the sub band access when changing the frequency band, operating mode, etc. in sub band. • Push [MAIN] for the main band access. tRotate [AF] for sub band to adjust the sub band audio level. yTo transmit on the sub band readout, push [CHANGE] or [SPLIT]. NOTE: • A beat note may be heard depending on the fre- quency combination. • Receiver sensitivity will be decreased when the same frequency band and the same antenna are selected during dualwatch. • The RIT function can be used for the main read- out only. • The ∂TX function can be used for the transmit readout (main readout when the split function OFF; sub readout when the split function ON). [MAIN] [DUALWATCH] [CHANGE] Sub dial [AF] for sub [SPLIT] [SUB] 5 FUNCTIONS FOR RECEIVE • Split frequency operation during dualwatch

The noise blanker eliminates pulse-type noise such as the noise from car ignitions. The noise blanker is not available for FM mode. qPush [NB] to turn the noise blanker function ON and OFF. • [NB] indicator above their switch lights green. wRotate [NB] control to adjust the noise blanker threshold level. When using the noise blanker, received signals may be distorted if they are excessively strong or the noise type is other than impulse. Turn the noise blanker OFF, or rotate [NB] control to a shallow po- sition in this case. D NB set mode To deal with various type of noises, attenuation level and noise width can be set in NB set mode. qPush [NB] for 1 sec. to enter NB set mode. wPush [F-1•Y] or [F-2•Z] to select the desired item. eRotate the main dial to set the desired level or value. • Push [F-4•DEF] for 1 sec. to select a default value. rPush [EXIT/SET] to exit NB set mode. [NB] for main [NB] control for sub [NB] control for main [NB] for sub 5 FUNCTIONS FOR RECEIVE Set the noise attenuation level from 1 to 10. Set the noise pulse width from 1 to 100.

The noise reduction function reduces random noise components and enhances desired signals which are buried in noise. The DSP does the random noise re- duction function. qPush the [NR] to turn the noise reduction ON. • [NR] indicator above their switch lights green. wRotate the [NR] control to adjust the noise reduction level. ePush the [NR] switch to turn the noise reduction OFF. • [NR] indicator lights off. Deep rotation of the [NR] control results in audio signal masking or distortion. Set the [NR] control for maximum readability. I Dial lock function The dial lock function prevents frequency changes by accidental movement of the tuning dial. The lock func- tion electronically locks the dial. ➥Push [LOCK] to toggle the dial lock function ON and OFF. • The [LOCK] indicator lights when the dial lock function is in use. [LOCK] indicator for main [LOCK] for sub [LOCK] for main [LOCK] indicator for sub [NR] for main [NR] control for sub [NR] control for main [NR] for sub 5 FUNCTIONS FOR RECEIVE