MFJ-969 DELUXE Versa Tuner II
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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.
