Tuned Input Adjustments - Command Technologies COMMANDER HF-2500 Manual

TUNED INPUT CIRCUITS
The tuned input circuits utilize an L-C-L or "T" impedance matching
circuit with a high "Q" design. These circuits employ RF phase
compensating capacitors to reduce intermodulation products. The use
of mica trimmer type capacitors allows adjustments to precisely match
the transceiver to the amplifier. The rear panel provides easy access to
these trimmer capacitors. A front panel switch selects the proper input
filter by grounding an associated relay coil.

Tuned Input Adjustments

Your Commander amplifier has mica trimmer capacitors which are
easily accessed thru holes located on the rear panel. The tuned input
circuits are factory tuned and should not require any readjustment.
You can easily make adjustments for any change in your preference
for operating frequency range.
necessary because of slight variances in impedances between your
transceiver and the tuned input circuitry of the amplifier.
1. Install a SWR meter between the transceiver and the amplifier.
2. Make sure the Operate/Standby switch is in the operate position
and the band switch is set to the same band as the one for which you
are making adjustments. Your amplifier should also be properly tuned
and loaded.
3. Apply drive and observe the SWR, and adjust the trimmer
capacitor for minimum SWR. Be careful not to overdrive the amplifier.
4. Repeat this procedure each band.
Also, slight adjustments may be