Lectrosonics UH400A Instruction Manual

Featuring Digital Hybrid Wireless™ Technology U.S. Patent Pending INSTRUCTION MANUAL Rio Rancho, NM, USA www.lectrosonics.com Fill in for your records: Serial Number: Purchase Date:

transmitter models that began in the late 1980’s, serving ENG applications at television stations across the USA. In the mid-1990’s, the first UHF versions became available and the use of plug-on transmitters in motion picture produc- tion increased significantly. The current UH400A model has evolved to include every improvement and feature devel- oped since the first model was introduced. The UH400A is a rugged, machined aluminum package. Selectable voltage phantom power is provided allowing the UH400 to be used with the widest variety of microphones. LEDs located on the UH400A front panel make quick and accurate level settings without having to view the receiver. The battery compartment accepts any 9 volt alkaline or lithium battery and makes a positive connection via self-adjusting contacts. The UH400TM is a specialized version of the UH400A that is an integral part of a highly responsive, wireless test and measurement system. Only the UH400A and UH400TM transmitters are covered in this manual. Companion receivers are covered in separate manuals. The UH400A and UH400TM will operate with any 100 Series, 200 Series, 400 Series, IFB Lec- trosonics receiver in the same frequency group, or selected analog receivers from other manufacturers operating in the same frequency range. (Contact factory for details.)

Rio Rancho, NM 3 Table of Contents General Technical Description ..............................................................................................................................................................4 Introduction ...........................................................................................................................................................................................4 Digital Hybrid Technology .....................................................................................................................................................................4 Input Limiter ..........................................................................................................................................................................................5 No Pre-Emphasis/De-Emphasis...........................................................................................................................................................5 Pilot Tone Squelch ................................................................................................................................................................................5 Wide-Band Deviation ............................................................................................................................................................................5 Long Battery Life ..................................................................................................................................................................................5 Frequency Agility ..................................................................................................................................................................................5 Controls and Functions .........................................................................................................................................................................6 Power Switch ........................................................................................................................................................................................6 Power ON/OFF LED .............................................................................................................................................................................6 Phantom Power Voltage Select Switch .................................................................................................................................................6 Frequency Select Switches ..................................................................................................................................................................7 Input Jack .............................................................................................................................................................................................7 Modulation LEDs ..................................................................................................................................................................................7 Compatibility Mode Indicators ..............................................................................................................................................................8 Mic Level ..............................................................................................................................................................................................8 Frequency Blocks and Ranges .............................................................................................................................................................9 Operating Instructions ........................................................................................................................................................................10 Attaching the Microphone ...................................................................................................................................................................10 Mic Level Operating Tip ......................................................................................................................................................................10 Adjusting the Transmitter Frequency ..................................................................................................................................................11 Battery Replacement ..........................................................................................................................................................................11 Using the Polarity-Reversing Barrel Adapter ....................................................................................................................................12 Accessories ..........................................................................................................................................................................................12 Troubleshooting ...................................................................................................................................................................................13 Specifications and Features ...............................................................................................................................................................14 Service and Repair ...............................................................................................................................................................................15 Returning Units for Repair ..................................................................................................................................................................15 The UH400 transmitter is FCC type accepted under Part 74: 470 - 608MHz and 614 - 806MHz

Introduction The 400 system uses ± 75 kHz wide deviation for an extremely high signal to noise ratio. The switching power supplies provide constant Voltages to the trans- mitter circuits from the beginning (9.3 Volts) to the end (5.5 Volts) of battery life. The input amplifier uses an ultra low noise op amp for quiet operation. It is gain controlled with a wide range dual envelope input compressor which cleanly limits input signal peaks over 30 dB above full modulation. Digital Hybrid Technology All wireless links suffer from channel noise to some degree, and all wireless microphone systems seek to minimize the impact of that noise on the desired signal. Conventional analog systems use compandors for enhanced signal to noise ratio, at the cost of subtle artifacts (known as “pumping” and “breathing”). Wholly digital systems defeat the noise by sending the audio information in digital form, at the cost of some combina- tion of power, bandwidth and resistance to interference. The Lectrosonics Digital Hybrid Wireless™ system (hereafter called Digital Hybrid) overcomes channel noise in a dramatically new way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link. This proprietary algorithm is not a digital implementation of an analog compandor but a technique which can be accomplished only in the digital domain, even though the inputs and outputs are analog signals. (As of this writing, the patent is still pending.) Channel noise still has an impact on received signal quality and will eventually overwhelm the receiver. The Digital Hybrid simply encodes the signal to use a noisy channel as efficiently and robustly as possible, yielding audio performance that rivals that of wholly digital systems, without the power and bandwidth problems inherent in digital transmission. As always, these advantages come at a cost. The Digital Hybrid system requires fairly intensive digital processing in both the transmitter and the receiver. These processors cost money, take up space and consume power. The Digital Hybrid system also requires that the underlying RF link be of excellent quality, with better frequency response and distortion characteristics than that required by conventional systems. Because it uses an analog FM link, the Digital Hybrid enjoys all the benefits of conventional FM wireless systems, such as excellent range, efficient use of RF spectrum, and long battery life. However, unlike con- ventional FM systems, the Digital Hybrid has done away with the analog compandor and its artifacts. Transmitter Phase Locked Loop Voltage Controlled Oscillator Freq Switches 11001001 A-D Converter Digital Signal Processor 11001001 D-A Converter Shunt Limiter Bicolor Modulation LEDs Microprocessor 9V Switching Power Supply +3.3v +3.2v +1.8v +6v -3v 50 Isolator Hi/Lo Pass Filter Audio Encoded Audio + Pilot Tone 11.3 MHz Reference Bicolor Power LED Audio Level Input Amp INPUT JACK +5V / +15V / +48V BIAS SUPPLY <-- (See Input Jack under Controls and Functions for details.) UH400A Block Diagram

Rio Rancho, NM 5 Input Limiter The 400 series transmitters employ a digitally-controlled analog audio limiter just before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, connected as a fast attack and release limiter followed by a slow attack and release limiter. The limiter recovers quickly from brief tran- sients, so that its action is hidden from the listener, but recovers slowly from sustained high levels, to both keep audio distortion low and preserve short term dynamic changes. The Modulation LEDs indicate limiter activity. When the -20 LED glows red and the -10 LED glows green with occasional red flickers, this indicates that the limiter is active and that the transmitter is fully modulated (audio level is between +0 and +10 dB). When the -10 LED glows solid red, this indicates that the level is +10 dB or more into limiting. Occasional forays by the -10 LED into the red are desirable for most applications, since the distortion introduced by the limiter is so minimal and full modulation is thus assured. We strongly recom- mend setting the audio level of the transmitter high enough so that the -10 LED occasionally flickers red. Generally speaking, some limiting is desirable in normal operation to improve the signal to noise ratio of the system. The limiting action is not audible and does not create distortion. A highly trained ear would hear only the compression of the peaks in the audio signal, which is desirable with most recorders and many sound reinforcement systems. No Pre-Emphasis/De-Emphasis The signal to noise ratio of the 400 system is high enough to preclude the need for conventional pre- emphasis (HF boost) in the transmitter and de-empha- sis (HF roll off) in the receiver. Pre-emphasis and de- emphasis in an FM radio system usually provides about a 10 dB improvement in the signal to noise ratio of the system, but the high frequency boost in the transmitter must be removed in a purely complementary manner or else the frequency response of the original audio signal will be altered. Pre-emphasis can also cause distortion in the receiver. As this signal is passed through the IF filters in the receiver, distortion can be produced, most noticeably at full modulation. De-emphasis cannot be applied until the signal is converted into audio, so there is no way around this problem short of eliminating pre-emphasis altogether. Neither of these problems occur in the 400 system Pilot Tone Squelch The 400 system uses one of 256 different ultrasonic tones between 25 and 32 kHz, that modulate the carrier to operate the receiver squelch. The pilot tone fre- quency is chosen according to which of the 256 channels has been selected by the frequency switch setting. The basic benefit of the pilot tone squelch system is that the receiver will remain muted until it receives the pilot tone from the matching transmitter, even if a strong RF signal is present on the carrier frequency of the system. The 400 Series insires that all transmitters in a system have different pilot tone frequencies so that even spurious RF from the wrong transmitters can’t open the receiver squelch. Wide-Band Deviation A ± 75 kHz deviation improves the capture ratio, signal to noise ratio and AM rejection of a wireless system dramatically, compared to the more commonly used ± 15 kHz deviation. Long Battery Life Switching power supplies throughout the design allow over 4.5 hours of operation using a single 9 Volt alkaline battery. (A 9 Volt lithium battery will provide over 12 hours of operation.) The battery contacts are spring loaded to prevent “rattle” as the unit is handled. Frequency Agility The transmitter section uses a synthesized, frequency selectable main oscillator. The frequency is extremely stable over a wide temperature range and over time. Two rotary switches, located on the side panel of the unit, provide 256 frequencies in 100 kHz steps over a 25.5 MHz range. This alleviates carrier interference problems in mobile or traveling applications.

microphones. The 3-pin XLR connector allows the transmitter to be used with any dynamic microphone, as well as many two wire positive bias lavaliere systems (such as those systems supplied by Lectrosonics). Power Switch The three position PWR OFF/PHTM/NO PHTM switch turns the unit on or off, and selects either phantom power, or no phantom power. Regardless of which position the switch is set, the pilot tone muting system effectively prevents “thumps” or transients from occur- ring during power up or power down. The PHTM (center) position of the power switch turns on the phantom power value selected by the Phantom Power Voltage Select switch, while the NO PHTM (fully on) position disables phantom power. Note: In order to avoid ddamage to some microphones, be careful to use the center (PHTM) position only when necessary and keep the Phantom Power Voltage Select switch in the 5 V position. (See Phantom Power Voltage Select switch.) Power ON/OFF LED This LED glows green when the battery is good. When the lamp glows red, there are about 30 minutes of operation left with the recommended lithium battery, and about 20 minutes of battery life left with an alkaline battery. The lamp will flash red when there are only a few minutes of life remaining in either type of battery. Note: A NiMH battery will give little or no warning when it is depleted. If you wish to use NiMH batteries in this unit, we recommend installing a fully charged batteries, noting the length of time that the batteries will run the unit and in the future use somewhat less than that time to determine when the battery needs to be replaced. A weak battery will sometimes light the POWER LED to the “good” green indication immediately after being put in the unit, but will soon discharge to the point where the LED will go red or shut down (just like a flashlight with “dead” batteries). If the Power LED fails to light when power is applied, replace the battery. Phantom Power Voltage Select Switch Note: The UH400TM can be used with the Earthworks M30 Test Microphone if pins 2 and 3 are reversed. A barrel adapter is provided for this purpose. This switch selects from three phantom voltages when the PWR switch is in the mid position. The voltages are: • 5 Volts for lavaliere microphones, • 18 Volts for some professional mics requiring high current and for many common stage mics that will operate over a wide phantom Voltage range of 12 to 48 Volts. With the proper adapter, this position can also be used with T power microphones. See our web site for details on finding or making the proper adapter. • 42 Volts for microphones that do in fact require a supply greater than 18 Volts. (See below for a discussion of why 42 and not a “true” 48 Volts.) For longest battery life use the minimum phantom voltage necessary for the microphone. Many stage microphones regulate the 48 Volts down to 10 Volts internally anyway, so you might as well use the 18 Volt setting and save some battery power. If you are not using a microphone for the input device, or are using a microphone that does not require phantom power, set the Power Switch to the NO PHTM position (No Phan- tom Power). This is the fully up position of the Power Switch. Phantom power should only be used with a fully floating, balanced device such as most microphones with a 3-pin XLR connector. If you use the phantom power with an unbalanced device or if pins 2 or 3 are DC connected to ground, then you will draw maximum current from the power supply. The UH400A is fully protected against such shorts but the 9 Volt battery will be drained at twice its normal rate. Controls and Functions Top View Control Panel –20 –10 POWER ON/OFF LED PW R O FF LEVEL P HTM N O P HTM 5V 1 8V 48 V MIC LEVEL PHANTOM POWER VOLTAGE SELECT (RECESSED) POWER SWITCH 0 1 2 3 4 5 A 9 8 7 6 B C D E F FREQUENCY 1.6MHz 100kHz 0 1 2 3 4 5 A 9 8 7 6 B C D E F Side View FREQUENCY SWITCHES (BEHIND DOOR) INPUT JACK INPUT JACK MODULATION LEDs

Rio Rancho, NM 7 The transmitter can supply 4 mA at 42 Volts, 8 mA at 15 Volts, and 8 mA at 5 Volts. The 42 Volts setting actually supplies the same voltage to a 48 Volt microphone as the DIN standard arrangement due to a dynamic biasing scheme that does not have as much voltage drop as the DIN standard. The 48 Volt DIN standard arrangement protects against shorts and high fault current with high resistance in the power supply feeds to pins 2 and 3. This protects the supply if the supply current is accidentally shorted to ground and also keeps the microphone from being attenuated by the power supply. The UH400A improves on those functions and is able to use less power from the battery by using constant current sources and current limiters. With this dynamic arrangement the UH400A can also supply more than twice the current of competing 48 Volt plug on units and provide four times the current to some very high end 18 Volt microphones. The 5 Volt setting is provided for lavaliere microphones made by us and others. Do not power lavalieres from the 15 or 48 Volt setting as the microphone will be most likely destroyed. Lectrosonics makes an adapter, MCA5X, that will adapt our standard TA5F 5 pin micro- phones to the UH400A. This adapter also provides protection against excessive phantom voltage. If voltages higher than 5 Volts are applied to the adapter, a Zener diode will shunt excess voltage to ground. The microphone won't work until the voltage is correctly reduced to 5 Volts. If you have an older lavaliere mic that was wired directly to an XLR for use with the earlier UH200's, we strongly recommend building our protec- tion circuit into the XLR to prevent accidental destruc- tion of the lavaliere. Frequency Select Switches Two 16 position rotary switches adjust the center frequency of the carrier within the transmitter’s fre- quency block and for setting Compatibility Modes. The 1.6 MHz is a coarse adjustment and the 100 kHz is the fine adjustment. Each transmitter is factory aligned at the center of its operating range. The default position of the frequency select switches is in the center of the transmitter’s range. Input Jack Standard 3-pin Switchcraft XLR type. Pin 2 is signal, pin 3 is a floating signal ground, and pin 1 is case ground (see schematic below). The UH400A is self-locking onto a standard microphone. Note: If severe noise is experienced when the microphone is moved with respect to the UH400A, the cause is an unbalanced condition between pins 2 and 3 of the microphone. Modulation LEDs The Modulation LEDs indicate the proper setting of the MIC LEVEL control. There are two bicolor modulation LEDs that can light either red or green depending on the amount of gain applied. The transmitter should be set so that both LEDs glow green, with the -20 LED occasionally blinking red. Frequency Select Switches Left Switch 1.6 MHz Right Switch 100 kHz Top View –10 –20 MODULATION LEDs 1 2 3 +5V / +18V / +48V 4.7uf 1uh 1uh 1uh To Mic Preamp 1000 I 100 pf 511 1000 Input Jack Schematic Signal Level -20 LED -10 LED Less than -20 dB Off Off -20 dB to -10 dB Green Off -10 dB to +0 dB Green Green +0 dB to +10 dB Red Green Greater than +10 db Red Red

The Modulation LEDS will blink when power is first applied to the transmitter to indicate the selected operating mode. Immediately after, all LEDS will blink together red, then green, followed by the Modulation LEDs (-20 and -10) blinking to indicate the operating mode. The –20 and –10 LEDs will blink: • Once for 100 Series mode • Two times for 200 Series mode • Three times for mode 3 (Contact Factory for Details) • Four times for 400 Series mode • Five times for IFB Series mode • Six times for mode 6 (Contact Factory for Details) Mic Level Used to adjust the audio input level for the proper modulation. Top View –10 –20 POWER ON/OFF LED MODULATION LEDs

Rio Rancho, NM 9 Each UH400A transmitter is built to cover a pre-se- lected range of frequencies (a “block”). The transmitter will tune to any of 256 different frequencies within this factory assigned block. (See Operating Frequencies (MHz).) The block number is determined by this formula: 25.6 × Freq. (MHz) = Lowest freq. (MHz) in the block To determine a block number from a frequency: Freq. (MHz) divided by 25.6 = Block number It is handy to remember these formulas, in case you do not have a copy of the table. For example, suppose you need to know which block covers 685.500 MHz, without using the table: 685.500 divided by 25.6 = 26.77734375 The first two digits left of the decimal are the block number. In this case, 685.500 MHz falls within block 26. Part of block 23 is not used since it covers a 608 to 614 MHz band that is illegal for use with wireless micro- phones. Operating Frequencies (MHz): Block 21 537.600 - 563.100 Block 22 563.200 - 588.700 Block 23 588.8 00- 607.900; 614.100 - 614.300 Block 24 614.400 - 639.900 Block 25 640.000 - 665.500 Block 26 665.600 - 691.100 Block 27 691.200 - 716.700 Block 28 716.800 - 742.300 Block 29 742.400 - 767.900 Block 30 768.000 - 793.500 (export only) Frequency Blocks and Ranges Use the two Frequency Switches to set the transmitter’s carrier frequency to match the associated receiver. For example, assume that the transmitter and receiver are both assigned Block 25 and the receiver’s switches are set to 658.400 MHz. Subtract the lowest frequency for Block 25 from the assigned frequency to determine the switch settings for the transmitter. 658.400 -640.000 18.400 Divide the result by 1.6 and round down the nearest two digits to determine the coarse Frequency Switch setting. 18.4/1.6 = 11.5 or 11 (B on the switch dial) Multiply the coarse Frequency Switch setting by 1.6 and subtract that number from the original result to deter- mine the setting for the fine Frequency Switch. 11 x 1.6 = 17.6 18.400 - 17.600 .800 or 8 Therefore, the Frequency Switch settings for this transmitter would be B8.

Press firmly, listen for click. Depress collar fully. Hold the transmitter case and rotate the collar in the direction shown. Do this over a soft surface as the microphone may pop off suddenly Click! Operating Instructions Attaching the Microphone 1. Insert the UH400A into the XLR connector on the bottom of the selected microphone. Listen for the “click” that indicates the transmitter assembly has locked on to the microphone. Gently pull on the mic to insure proper locking has occurred. 2. If necessary, set the phantom power voltage for the mic. If the mic does not require phantom voltage, set the Phantom Power Voltage Select switch to 5 VDC to reduce the possibility of damage to the mic when the transmitter is powered up. 3. Set the MIC LEVEL control to minimum (fully counterclockwise). 4. Turn on the transmitter by setting the Power Switch to PHTM, if the mic requires phantom power, or to NO PHTM, if the mic does not require phantom power. (Refer to the specifications for the mic you are using to determine if phantom power is re- quired.) 5. Hold the mic as you will when you will be using it, or if the mic will be stationary, such as attached to a lectern or mic stand and speak or sing into it at the same voice level that will be actually used during the program. 5. Start with the Mic LEVEL control at maximum counterclockwise, then observe the front panel Modulation LEDs. Slowly turning the Audio LEVEL control clockwise while talking into the mic at the same level that will be used during the program. Increase the Mic LEVEL control until the -20 LED glows red and the -10 dB glows green with occa- sionally red flickers. This indicates full modulation. 6. Once the gain has been adjusted, the remainder of the audio sound system can be energized and adjusted. Mic Level Operating Tip The LEVEL control should not be used to control the volume of your sound system or recorder levels. The LEVEL control matches the transmitter gain with the user’s voice level and mic’s position. If the audio level is too high — both red LEDs will glow solid red. This condition may reduce the dynamic range of the audio signal. If the audio level is too low — neither LED will glow, or only the –20 LED will glow green. This condition may cause hiss and noise in the audio. Different voices will usually require different settings of the LEVEL control, so check this adjustment as each new person uses the system. If several different people will be using the transmitter and there is not time to make the adjustment for each individual, adjust it for the loudest voice. Selecting the Compatibility Mode This unit is capable of working with Lectrosonics 400 series digital hybrid receivers, 200 Series, 100 Series and IFB analog receivers. It is also capable of working with analog wireless receivers from other manufacturers (contact the factory for details). The transmitter can be easily set to the compatibility mode of the matching receiver using the supplied screwdriver. Note: The UH400A is supplied from the factory as a 400 series transmitter 1. Ensure the battery is good. If the Power LED lights up when the Power Switch is set to PHTM or NO PHTM, the battery is good and correctly installed. 2. Turn off the transmitter. Control Panel PWR OFF LEVEL PHTM NO PHTM 5V 15V 48 V PHANTOM POWER VOLTAGE SELECT POWER SWITCH

Rio Rancho, NM 11 3. With a small screwdriver (included with your unit), set the frequency change switches to CC. (for Change, Change). To gain access to these switches, slide the access door open with a finger- nail. 4. Set the Power Switch to NO PHTM briefly – just a couple of seconds for the front panel LED’s to light up, then immediately turn the unit off. 5. Change the Frequency Select switches to one of the following settings: MODE SWITCH SETTINGS 100 Series 1,1 200 Series 2,2 Mode 3 (Other analog*) 3,3 400 Series (Digital Hybrid) 4,4 IFB Mode 5,5 Mode 6* 6,6 *Contact factory for details. 6. Turn the transmitter on, when the front panel LEDs light up, immediately turn the unit off. 7. Change the switches to 0,0. 8. Energize the transmitter and verify the new compatibil- ity mode. The front panel -20 and -10 LEDs will blink: • Once for 100 Series mode • Two times for 200 Series mode • Three times for mode 3 (contact factory) • Four times for 400 Series mode • Five times for IFB mode • Six times for mode 6 (contact factory) The Compatibility Mode will remain set until changed with the above procedure. Adjusting the Transmitter Frequency If you are experiencing interference from another signal on your frequency, you may want to change the operat- ing frequency of your system. This is done with the Frequency Switches. The left switch changes the operating frequency by 1.6 MHz per step and the right switch changes it 100 kHz per step. If you are experiencing interference, change the operating frequency in 100 kHz steps to find a clear channel. If it is not possible to find a clear channel using the 100 kHz switch, return it to its original position and change the 1.6 MHz switch by one click then try the 100 kHz switch again. Battery Replacement The UH400A transmitter is powered by a standard alkaline 9 volt battery. It is important that you use ONLY ALKALINE OR LITHIUM batteries for longest life. Standard zinc-carbon batteries marked “heavy duty” or “long-lasting” are not adequate. They will provide only about five minutes of operation. Similarly, ni-cad rechargeable batteries only give one hour of operation, and will also run down quite abruptly. Alkaline batteries provide about 4.5 hours of operation while lithium batteries will run the unit for about 12 hours. To open the battery compartment, press upward on the cover door in the direction of the arrow as shown in the drawing. Only slight, sliding pressure is needed to open and close the battery door. Swing the door open and take note of the location of the positive (+) and negative (-) terminals. Insert the new battery correctly and close the cover by reversing the opening procedure. Note that the battery door will NOT close if the battery is inserted incorrectly, since the terminals will hit a protective polarity barrier. Don’t force the battery door closed. If it is difficult to close, the battery is in backwards. The battery life will be affected by the amount of phantom power supplied to any microphones that require it. A high drain 48 volt microphone can shorten battery life by 40% or more. A light drain 18 volt micro- phone will make little or no difference in battery life. The only way to be sure is to test the transmitter and microphone combination with a brand new battery. CAUTION: Lithium batteries will expand and swell if allowed to go into a deep discharge. Be sure to remove them as soon as the battery is depleted. Stuck lithium batteries can be avoided by removing the label wrapping around the battery before use. This will allow the battery to swell but will still leave enough room in the compartment for the battery to fall out normally. Battery Compartment Action SWING OPEN RELEASE DOOR OBSERVE POLARITY Frequency Select switches Left Switch 1.6 MHz Right Switch 100 kHz 0 1 2 3 4 5 A 9 8 7 6 B C D E F 0 1 2 3 4 5 A 9 8 7 6 B C D E F

MC5AX TA5 to XLR adapter for connecting a lavaliere microphone to the UH400. Using the Polarity- Reversing Barrel Adapter The UH400TM transmitter comes with a polarity-reversing XLR barrel adapter for use with Earthworks M30 measurement microphones. Simply connect the adapter between the transmitter and microphone. Earthworks M30 Barrel Adapter UH400TM

Rio Rancho, NM 13 Troubleshooting Before going through the following chart, be sure that you have a good battery in the transmitter. It is important that you follow these steps in the sequence listed. Symptom Possible Cause Transmitter Battery LED Off 1. Battery is inserted backwards. 2. Battery is dead. No Transmitter Modulation LEDs 1. Gain control turned all the way down. 2. Battery is in backwards. Check power LED. 3. Mic capsule is damaged or malfunctioning. 4. Mic cable damaged or mis-wired. 5. Phantom power not enabled for mic that requires it. Receiver RF Lamp Off 1. Transmitter not turned on. 2. Transmitter battery is dead. 3. Receiver antenna missing or improperly positioned. 4. Transmitter and receiver not on same frequency. Check switches/display on transmitter and receiver. 5. Operating range is too great. No Sound (or Low Sound Level), Receiver Mod Level LEDs Are On 1. Receiver output level set too low. 2. Receiver output is disconnected; cable is defective or mis-wired. 3. Sound system input is turned down. No Sound (or Low Sound Level), Receiver Mod Level LEDs Are Off 1. Transmitter gain (audio level) set too low. 2. Faulty microphone 3. Phantom power not enabled for mic that requires it. 4. Not enough current to power microphone. (Earthworks M30 is only known microphone we’ve found to exhibit this issue.) DISTORTED SOUND 1. Transmitter gain (audio level) is far too high. Check mod level lamps on transmitter and receiver as it is being used. (Refer to the Operating Instructions section for details on gain adjustment) 2. Receiver output may be mismatched with the sound system or recorder input. Adjust output level on receiver to the correct level for the recorder, mixer or sound system. 3. Excessive wind noise or breath “pops.” Reposition microphone and/or use a larger windscreen. 4. Transmitter is not set to same frequency as receiver. Check that frequency select switches on receiver and transmitter match. HISS AND NOISE – AUDIBLE DROPOUTS 1. Transmitter gain (audio level) far too low. 2. Receiver antenna missing or obstructed. 3. Operating range too great. EXCESSIVE FEEDBACK 1. Transmitter gain (audio level) too high causing the limiter to reduce the dynamic range which in turn causes feedback. Check gain adjustment and/or reduce receiver output level. (Refer to the Operating Instructions section for details on gain adjustment) 2. Transmitter too close to speaker system. 3. Mic is too far from user’s mouth.

Frequency selection: 256 frequencies in 100 kHz steps RF Power output: 100 mW (nominal) Pilot tone: 25 to 32 kHz; 5 kHz deviation (in 400 Series mode) Frequency stability: ± 0.002% Deviation: ± 75 kHz max. (in 400 Series mode) Spurious radiation: 60 dB below carrier Equivalent input noise: –118 dBV, A-weighted Input level: Nominal 2 mV to 300 mV, before limiting; Greater than 1.0 V maximum, with limiting. Input impedance: 1 k Ohm Phantom power: Selectable; 5, 18, 48 VDC Input limiter: Soft limiter, >30 dB range Gain control range: 43 dB; semi-log rotary control Modulation indicators: Dual bicolor LEDs indicate modulation of –20, -10, 0 and +10 dB referenced to full modulation. Low frequency roll-off: –12 dB/octave; 70 Hz (35 Hz for UH400TM) Controls: Control panel knob adjusts audio gain. Rotary switches on bottom panel adjust transmitter frequency. Audio Frequency Response: 90 Hz to 20 kHz, +/-1 dB (40 Hz to 20 kHz, +/- 1 db for UH400TM) Note: The audio is deliberately rolled off at 70Hz using a 12 dB/octave filter on the UH400A. This filter cannot be disabled. Signal to Noise Ratio (dB): Note: The dual envelope “soft” limiter provides exceptionally good handling of transients using variable attack and release time constants. Once activated, the limiter compresses 30+ dB of transmitter input range into 4.5 dB of receiver output range, thus reducing the measured figure for SNR without limiting by 4.5 dB Total Harmonic Distortion: 0.2% typical (400 Series mode) Antenna: Built-in Battery Type: 9V alkaline or lithium Battery Life: 4.5 Hours with alkaline 9 Volt, 12 hrs with lithium (Battery life will vary with battery brand, phantom power voltage setting and mic current drain.) Weight: 6.5 oz. with lithium battery, no mic Overall Dimensions: 1.5 x 1.5 x 4.2 inches (Not including microphone.) Emission Designator: 190KF3E Specifications subject to change without notice. The FCC requires that the following statement be included in this manual: This device complies with FCC radiation exposure limits as set forth for an uncontrolled environment. This device should be installed and operated so that its antenna(s) are not co-located or operating in conjunction with any other antenna or transmitter. Specifications and Features SmartNR No Limiting w/Limiting OFF 103.5 108.5 NORMAL 107.0 111.5 FULL 108.5 113.0

Rio Rancho, NM 15 Service and Repair If your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check the interconnect- ing cables and then go through the Troubleshooting section in this manual. We strongly recommend that you do not try to repair the equipment yourself and do not have the local repair shop attempt anything other than the simplest repair. If the repair is more complicated than a broken wire or loose connec- tion, send the unit to the factory for repair and service. Don’t attempt to adjust any controls inside the units. Once set at the factory, the various controls and trimmers do not drift with age or vibration and never require readjustment. There are no adjustments inside that will make a malfunctioning unit start working. LECTROSONICS’ Service Department is equipped and staffed to quickly repair your equipment. In warranty repairs are made at no charge in accordance with the terms of the warranty. Out-of-warranty repairs are charged at a modest flat rate plus parts and shipping. Since it takes almost as much time and effort to determine what is wrong as it does to make the repair, there is a charge for an exact quotation. We will be happy to quote approximate charges by phone for out-of-warranty repairs. Returning Units for Repair For timely service, please follow the steps below: A. DO NOT return equipment to the factory for repair without first contacting us by letter or by phone. We need to know the nature of the problem, the model number and the serial number of the equipment. We also need a phone number where you can be reached 8 A.M. to 4 P.M. (U.S. Mountain Standard Time). B. After receiving your request, we will issue you a return authorization number (R.A.). This number will help speed your repair through our receiving and repair departments. The return authorization number must be clearly shown on the outside of the shipping container. C. Pack the equipment carefully and ship to us, shipping costs prepaid. If necessary, we can provide you with the proper packing materials. UPS is usually the best way to ship the units. Heavy units should be “double-boxed” for safe transport. D. We also strongly recommend that you insure the equipment, since we cannot be responsible for loss of or dam- age to equipment that you ship. Of course, we insure the equipment when we ship it back to you. Mailing address: Shipping address: Telephone: Lectrosonics, Inc. Lectrosonics, Inc. (505) 892-4501 PO Box 15900 581 Laser Rd. (800) 821-1121 Toll-free Rio Rancho, NM 87174 Rio Rancho, NM 87124 (505) 892-6243 Fax USA USA Web: E-mail: www.lectrosonics.com [email protected]

581 Laser Road NE • Rio Rancho, NM 87124 USA • www.lectrosonics.com (505) 892-4501 • (800) 821-1121 • fax (505) 892-6243 • [email protected] LIMITED ONE YEAR WARRANTY The equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warranty does not apply to used or demonstrator equipment. Should any defect develop, Lectrosonics, Inc. will, at our option, repair or replace any defective parts without charge for either parts or labor. If Lectrosonics, Inc. cannot correct the defect in your equipment, it will be replaced at no charge with a similar new item. Lectrosonics, Inc. will pay for the cost of returning your equipment to you. This warranty applies only to items returned to Lectrosonics, Inc. or an authorized dealer, shipping costs prepaid, within one year from the date of purchase. This Limited Warranty is governed by the laws of the State of New Mexico. It states the entire liablility of Lectrosonics Inc. and the entire remedy of the purchaser for any breach of warranty as outlined above. NEITHER LECTROSONICS, INC. NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, CONSEQUENTIAL, OR INCIDENTAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THIS EQUIPMENT EVEN IF LECTROSONICS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT SHALL THE LIABILITY OF LECTROSONICS, INC. EXCEED THE PURCHASE PRICE OF ANY DEFECTIVE EQUIPMENT. This warranty gives you specific legal rights. You may have additional legal rights which vary from state to state.