MFJ -969 DELUXE Versa Tuner II Manuals

MFJ-969 DELUXE Versa Tuner II 1 MFJ-969 Versa Tuner II Instruction Manual General Information The MFJ-969 is a 300 watt RF output power antenna tuner that will match any transmitter or transceiver to virtually any antenna. Peak or average forward and reflected power and SWR can be read on the illuminated cross-needle meter. The MFJ-969 uses a "T" matching network and covers all bands between 160 and 6 meters. This network will tune dipoles, inverted-vees, verticals, mobile whips, beams, random wires, and many other antennas. The MFJ-969 has rear panel connectors for coaxial, single wire or two wire feedlines. A built-in 4:1 balun allows the use of balanced open wire, twinlead, or twin-axial feedlines. An internal eight position antenna-selector switch selects a built-in 50 ohm dummy load, two separate coaxial line outputs, or a single wire line-balanced line output. All of these functions can be selected in tuned (with tuner's "T" network in line) or bypassed (no tuning circuit) configurations. Peak Reading SWR/Wattmeter The illuminated cross-needle meter measures the peak or average FORWARD power, REFLECTED power, and SWR. The wattmeter is active in all ANTENNA SELECTOR positions. To use the wattmeter without using the MFJ-969 tuning circuits select one of the ANTENNA SELECTOR positions under BYPASS. NOTE: The meter ON/OFF switch must be ON for the meter circuit to function. The MFJ-969 wattmeter circuit does not function accurately if the Auto Tuner in your radio is used. To disable the meter, turn the meter ON/OFF switch to the OFF position. Set the ANTENNA SELECTOR switch to one of the bypass positions when using the Auto Tuner in your radio. Peak envelope power (PEP) is measured when the PEAK or AVERAGE METER push button (right-hand side) in placed in the PEAK (in) position. Peak power and average power values are equal with steady unmodulated carriers, FSK, or FM. The PEP power is twice the average power with SSB two tone test modulation. PEP power may be any amount larger than the average power with SSB voice signals. The metering circuit in this unit provides very accurate forward peak power readings during with any form of modulation. Either an internal 9 volt battery for portable operation, or an external supply can be used to power the peak detector. Current demand is very low, and the 9 volt battery will last its' shelf life.