AMERITRON AL-80B, Инструкция по эксплуатации

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AL-80B Instruction Manual
19
Never under-load the amplifier to reduce the output power. The amplifier "LOAD" control must be
set to a high enough position (clockwise) to prevent excessive voltage and arcing in the tank circuit
or excessive grid current. Repeated tripping of the grid overload circuit or intermittent arcing
probably indicates the "LOAD" control is adjusted too low.
1 . Set the AL-80B front panel switches as follows:
POWER to OFF
OPR-STBY
to
STBY
MULTIMETER
to
HV
2.
Plug the ac line cord into the proper voltage outlet.
3.
Place the main power switch in the "ON" position. The meter lamps should light and the blower
should start. Read the 3500 volt scale on the multimeter. It should indicate 3100 volts nominal
and no more than 3200 volts.
4. With the amplifier still on "STBY", tune the exciter into a normal 50 ohm load according to the
manufacturer's instructions (solid state radios do not normally require this adjustment). Turn the
exciter drive down after tuning.
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 3-1/4 2-1/2
3.600 2-3/4 1-1/2
7.050 7-1/4 4-1/2
10.125 6 0
14.050 8-1/2 5-1/4
18.125 8-1/4 4-1/2
21.050 9
7
24.900 8-3/4 6-1/4
28.050 8-1/4 7-3/4
PHONE (SSB)
Frequency PLATE LOAD
1.850 4 3
3.900 3-1/2 3-3/4
7.200 7-1/2 4-1/2
14.250 8-1/2 5-1/2
21.350 9
7
28.500 9-1/4 8