Alpha 8410 Linear Amplifier User Manual
RKR Designs LLC
Operating the Amplifier
DOCNUMBER 8410
Document Issue 1.1
Page 5–6
August 2015
55
5
Step 2
Set the BAND, TUNE, and LOAD controls to the values given in your
amplifier’s specific tuneup table. Note that final TUNE and LOAD
settings will vary with operating frequency, antenna characteristics, and
power level.
Step 3
Reduce the transceiver carrier output control to 0.
Step 4
Move the
OPR/STBY
switch to
OPR
(operate).
The OPR LED lights up.
Step 5
On the multimeter selector-switch bargraph, select the GAIN function.
Step 6
Switch the transceiver to CW and increase its carrier output to ~15 W (the
amplifier output will be ~300–500 W).
Step 7
Do the following:
7a
Adjust the TUNE control to deflect the GAIN LED maximum
rightward.
7b
Adjust the LOAD control to place the illuminated GAIN LED
between the white lines above and below the LED bargraph.
Repeat this step at least twice.
Step 8
Increase the excitation power until the amplifier output is ~1500 W.
Step 9
Do the following:
9a
Adjust the TUNE control to deflect the GAIN LED maximum
rightward.
9b
Adjust the LOAD control to place the illuminated GAIN LED
between the white lines above and below the LED bargraph.
Step 10
Touch up the TUNE control for maximum power output.
The amplifier is now correctly tuned to deliver 1500 W RF output on SSB,
CW, FSK, SSTV, and FM.
The GAIN LED normally fluctuates during modulation or keying. If the
first red LED on the RF OUTPUT bargraph lights, output exceeds 1500
W. It is normal for the GAIN LED to vary during standard operation,
especially for SSB.
Step 11
Proceed to
“Operate the Amplifier,” page 5–7
.
