MFJ-962E Instruction Manual
7
Then place the POWER switch in the LO and AVG meter positions.
4. Starting from the minimum INDUCTOR position (highest number), turn the INDUCTOR
control counter-clockwise (adding more inductance) while applying a slight amount of
power (less than 25 watts). Tune for the lowest reflected power and maximum forward
power (lowest SWR).
5. In this order, adjust the ANTENNA control, INDUCTOR, and TRANSMITTER control
for lowest reflected power (and SWR). Repeat this step a few times until the reflected
power is zero.
6. If the SWR did not reach 1:1 in step 5, turn the INDUCTOR control counter-clockwise (to
a lower number) again and repeat Step 5. For maximum power handling and efficiency,
always adjust the capacitors to the lowest front panel number (highest capacitance) that
allows proper antenna matching. This insures maximum power handling and lowest power
loss in the tuner.
7. Advance the power (do not exceed 100 watts) and, if necessary, touch up the ANTENNA
and TRANSMITTER controls for minimum reflected power and maximum forward power
(lowest SWR). Remove the power.
8. After adjusting the tuner for minimum SWR, the amplifier may be turned on. The METER
switch should be placed in the HI position, and the amplifier tuned according to the
manufacturer's instruction.
9. For quick retuning of the tuner, record the INDUCTOR and CAPACITOR settings for
each band.
Note: Maximum power handling occurs when both the TRANSMITTER and ANTENNA
capacitors are set at the lowest front panel numbers and the inductor is set at the
highest possible number that permit matching the antenna. Following this guideline
will insure maximum power handling capability and efficiency, and the least critical
tuning adjustments.
Operating Notes
1. While this tuner is designed to have as large a tuning range as possible, there are limits to the
tuning range of the capacitors. Some antennas may require more or less capacitance than the
controls have. In these cases, the SWR may not be reduced to 1:1. If the SWR is higher than
the limits on your rig, try changing the length of the antenna or feedline to bring the
impedance within the tuning range of the tuner.
2. When adjusting the tuner, use the lowest number on the TRANSMITTER, ANTENNA, and
minimum INDUCTANCE that produces a good SWR. This will reduce tuner losses and
increase the power rating of the tuner.
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