AL-800H Instruction Manual
20
5.
Place the amplifier's
"BAND"
switch on the same band as the exciter. Set the
"PLATE"
control and
the
"LOAD"
control as indicated below:
CW
Frequency Plate
Load
1.810 3-1/2 6-1/4
3.600 1-3/4 0-1/2
7.050 5 1-3/4
10.125 5-1/2 2-1/2
14.050 8
6
18.125 8 5-1/2
21.050 9 6-1/2
24.900 8-1/2 6-1/2
28.050 9 7-1/2
PHONE (SSB)
Frequency Plate
Load
1.850 3-1/2 7
3.900 3 3-1/2
7.200 5-1/4 4-3/4
14.250 8-1/4
6
21.350 9-1/4 6-1/2
28.500 9 7-1/2
6.
With the exciter's drive level still on zero, observe the 1.5 ampere Ip scale on the left hand meter. It
should indicate zero (0) amperes.
7.
Place the
"STBY-OPR"
switch in the
"OPR"
position. Place the exciter in the transmit mode with no
RF output. The red
"XMT"
LED should light and the plate current (Ip on the left meter) should be
close to zero (0).
8.
With the exciter in the transmit mode, apply a very low amount of RF drive power (about 100 mW).
The plate current (Ip) should suddenly jump from zero to nearly 100 mA.
NOTE:
Currents may vary up to 25% due to component and line voltage tolerances. If the current
in this step is higher than expected, the RF level from the exciter may be too high.
If the exciter does not allow adjustment to very low CW power levels, the exciter can be placed in the
SSB mode and the audio (microphone) gain control advanced from minimum while speaking until the
plate current (Ip) just flickers upwards. The plate current (Ip) should be around 100 mA on these
flickers.
9.
Place the
"MULTIMETER"
switch in the
"ALC SET"
position. Adjust the front panel
"ALC
SET"
control until the multimeter indicates 10 volts. This adjustment will limit the amplifier's grid
current to approximately 50 mA.
