Instruction manual

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AL-800 Instruction Manual

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 5 volts. This adjustment will limit the

amplifier's grid current to approximately 25 mA.

> Steps 10a and 11a require a connection from the amplifier's ALC output to the exciter's ALC

input.

> Steps 10b and 11b should be used if the exciter and amplifier ALC lines are not connected.

Note:

Step number 10 requires the simultaneous observation of the plate current (Ip) and the grid

current (Ig).

10a. If the ALC line is connected, adjust the exciter's drive or power output control to maximum.

NEVER ALLOW THE GRID CURRENT (Ig) TO EXCEED 30 mA OR THE PLATE CURRENT

(Ip) TO EXCEED .6 AMPERES AT THIS STAGE OF TUNING. If either current exceeds these

limits, reduce the exciter's power. Adjust the

"PLATE"

control for maximum output power.