AMERITRON AL-82 Manual de instruções - Página 10
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Imprimir páginaCW PROCEDURE
Follow these instructions in numerical order. If the various
meter readings are different than indicated, check the con-
nections from the exciter to the amplifier and make sure they are
correct. Consult the manual for the exciter.
Be sure the transformer is correctly installed and wired for your
line voltage. See the "Transformer installation" section on page
4 and 5 for wiring details.
1. Set the AL-82 front panel switches as follows:
POWER TO OFF
OPR-STBY TO STBY
SSB-CW TO CW
MULTIMETER TO
2. Plug the AC line cord into the proper voltage outlet.
3. Set the Power Switch to the ON position. The meter lamps
should light and the blower should start. Read the 4000 volt
scale on the Multimeter. It should indicate 3600 volts
nominal and no more than 3700 volts.
4. With the amplifier still on STANDBY, tune the exciter into a
normal 50 ohm load according to the manufacturer's
instructions. Turn the exciter drive fully down after tuning.
5. Place the amplifier mode switch in the CW position, the
bandswitch on the same band as the exciter, the PLATE
control in the dial range for the band selected and the load
control as indicated:
OPERATION
6. With exciter drive still at zero, place the MULTIMETER
switch in the Ip position. Observe the 1000 mA scale. The
meter should read zero (0). Place the STBYOPR switch in
the OPR position.
7. Key the exciter (no drive) and observe the plate current on the
1000 mA scale. It should be 75 mA. Place the CW-SSB
switch in the SSB position. Plate current should now read
150 mA. Return the CW-SSB switch to the CW position.
Note: The no drive currents will vary up to 25% due to
component and line voltage tolerences.
8. Apply only enough drive to indicate a grid current of 100 mA
or an Ip of no more than 500mA. Tune the PLATE control
for maximum output power or grid current. It is normal for
the plate current to dip at this point. If the grid current goes
over 150 mA, reduce the drive at once. Unkey the exciter.
9. Place the MULTIMETER switch in the PO position and
observe the 2000 Peak RF Watts scale. Increase the drive
until 200 mA of grid current is indicated. Adjust the LOAD
and PLATE controls for maximum output. The grid current
may be lower now.
10. Advance the drive to 250 mA of grid current. Adjust the
LOAD and PLATE controls for maximum output power.
The output should be over 1000 watts now.
11. Apply enough drive to indicate either 1500 watts of output
power or 300 mA of grid current. Re-peak the LOAD and
PLATE controls. The final grid current should be around
250 mA and the plate current below 900 mA.