Alpha 8100 Operating Manual page 41

CAUTION:
If at any time in the following procedure the amplifier fails to respond as described,
remove drive immediately and turn the OPR/STBY switch to STBY! Verify all
connections and cables, turn the amplifier switch to OPR and proceed with the
tuning procedure.
Alpha Radio Products recommmended tune up procedure.
"Dip and Load" Method
Tuning up for Operation at 1,500 W RF Output.
Preset BAND, TUNE, and LOAD controls to the nominal positions given in your amp's specific tune up
table or Table 6.3:
Note: Final TUNE and LOAD settings will vary with the operating frequency, antenna characteristics and
power level.
1. Please limit the transceiver drive to about 65W for tuning up and operating the amp.
2. Set Multimeter to Ip (Plate Current). Set TUNE and LOAD controls to numbers indicated
in the tuneup sheet originally included with the amplifier.
3. Key radio with 20W drive and adjust TUNE control for a peak in RF out which should
be at the same point as a dip in Ip.
4. Increase drive to get 1000W output, going back and forth between the TUNE and
LOAD to peak the RF output. If more output is desired, increase drive from radio slightly,
increase LOAD for a peak in RF out, then peak RF out with TUNE control.
5. When the amplifier is tuned correctly on 160m thru 40m, the Ip should range between
0.9A and 1.1 A (read on the 0-to-1.5A scale) for 1500W output, and input drive should not
need to be more than about 60W. On 20m the Ip will usually be about 1.0A for 1500W
output.
6. Plate current (Ip) is the most useful parameter to monitor on the multimeter bargraph
during normal operation of the amplifier.
ALPHA 8100 OPERATING MANUAL
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