MFJ-1625 Instruction Manual Window/Balcony Mount Antenna
7
Tuning Procedure
WARNING: Never transmit while changing the INDUCTOR SELECTOR.
1. First, tune for maximum receiver noise as follows:
• While listening to your desired receive frequency, adjust the ANTENNA control for
maximum receiver noise.
• Adjust the MATCHING control for maximum receiver noise.
• Adjust the COUNTERPOISE control for maximum receiver noise.
Note: If no noise peak is evident, try adding extra capacitance with the
NORM/+C switch. Then reverse the HI-Z/LO-Z switch and re-try with both
positions of the NORM/+C switch.
2. For 80-40 meter operation, the loading coil may need to be adjusted.
• Begin by placing the tap on turn 0, which is the turn closest to the antenna. This will
short the entire coil. The tap should only be in contact with one coil at a time.
• Moving the tap down or increasing the number of turns increases the electrical length
of the loading coil. This adds inductance to the whip antenna making it more useful
on 80-40 meters.
3. Apply just enough power on CW (or AM/FM/RTTY) to obtain a noticeable deflection on
the RF CURRENT meter.
4. Carefully adjust the ANTENNA, MATCHING and COUNTERPOISE controls for
maximum RF current as follows.
• Adjust the MATCHING capacitor for maximum RF current.
• Adjust the COUNTERPOISE inductor for maximum RF current.
• Try plus or minus a position or two on the ANTENNA inductor, along with tuning
the MATCHING capacitor to see if higher RF current is achievable.
Note: These controls interact. Go back and forth between these adjustments as required until
maximum RF current is obtained.
5. The transmitter power may now be increased up to a maximum of 200 Watts. Make sure
you reduce the RF SENSITIVITY control as necessary to keep from pinning the RF
Current meter.
In Case of Difficulty
If this tuner fails to tune, please double check all connections and follow the tuning procedure
again.
The power rating of this tuner is 200 Watts on 80-10 meters. If this tuner arcs at the rated power
levels, please double-check all connections and follow the tuning procedure again.
If you are still unsuccessful, please read the following ANTENNA HINTS text.
(20 pages)
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