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1. Tune up the Amplifier as described for CW operation.
2. Advance the transceiver drive and audio levels so that the modulation crest does not exceed
400 ma of plate current, 100 ma of grid current, or 1,500 watts of PEP output.
USING THE FRONT PANEL ALC CONTROL TO ADJUST AMPLIFIER
OUTPUT POWER.
You may want to utilize an alternative to adjusting the drive power at the transceiver. The Front
Panel ALC Adjustment Control allows you to adjust the ALC for the amount of output power you
desire. Using this procedure, you would set the ALC Control to minimum (fully counter-clockwise).
Tune the amplifier for maximum output. Then advance the ALC Control (clockwise) for the amount
of output power you want. The ALC circuit of the amplifier supplies negative feedback voltage
to the transceiver which reduces the amount of drive coming into the amplifier.
Only use this
feature after your Amplifier has been properly tuned.
TUNED INPUT ADJUSTMENTS
Please refer to the Rear Panel Pictorial while reading the following.
Your Amplifier's tuned input circuits have been factory preset for the optimum match. However
before your initial operation, you may want to check the tuned input circuits for each band to see
if it has the proper match. A nominal match will show no more than 10 watts reflected with 100
watts of drive applied.
NOTE: DUE TO THE LARGE BANDWIDTH ON 80 METERS, THE SWR
ON THE ABOVE 3.950 MHZ IS HIGH. YOU MAY HAVE TO USE YOUR TRANSCEIVER'S
ANTENNA TUNER FOR A BETTER MATCH.
To check the tuned input match, follow the following procedure:
1. Place a wattmeter in line between the transceiver and the Amplifier which reads reflected RF
power.
2. Select one of the HF bands on your transceiver, and then select the corresponding band on
the amplifier.
3. Place the amplifier in the Operate mode, and tune the amplifier according to the tune up
procedure.
4. Observe the reflect power between the transceiver and the amplifier. If it exceeds 5 watts,
adjust the corresponding mica trimmer capacitor located on the rear panel. This trimmer capacitor
is located through the corresponding rear panel access hole in the area marked Tuned Input
Adjustments. Use only a non-conductive flat blade adjustment tool.
5. Advance the mica trimmer capacitor's adjustment screw either clockwise or counter-clockwise
and observe the reflected power indication on the watt meter. Adjust for minimum reflected power.
6. Repeat this procedure for each band.
