RF POWER TEST

TM 11-5820-918-13

Turn on the 1024 and 4011.

f. With the 1024 MODE switch in MAN position, press RESET, then press START.

g. If the RF power equipment is functioning properly, the RF wattmeter should

read greater than 50 and less than 150 watts throughout the frequency sweep.

h. Repeat step f with the .1 PWR/FULL PWR switch in the .1 PWR position. The

RF wattmeter (50W scale) should be greater than 5 and less than 15 watts throughout

the sweep.

i. If the RF output measured in steps g and h is only slightly out of specification

(either too high or too low) but otherwise good, adjust the synthesizer output level

as outlined in step k.

j. If there is not output or a very low output at any point during the sweep in the

RF power test steps g and h, refer to the RF power troubleshooting diagram, figure

5-3.

k. To adjust the transmitter RF power level follow the procedure below in the order

indicated:

(1) Connect equipment as shown in figure 5-2.

(2) Set the 1024 for DIRECT, 0.1 PWR operation (10 watt output).

(3) With the 1024 MODE switch in MAN position, press RESET. Transmitter out-

put should be approximately 10 watts at 2 MHz (not sweeping).

(4) Remove 1024 top cover and adjust R49 on the synthesizer down converter

card in the 5030-1101 module of the 1024 (1A1A2R49) for an RF output of 12 watts at

401-J7. Note that 1A1A2R49 and R50 are both accessible through a small hole in the

cover of the synthesizer module, (top side of the upper module in the 1024) such that

the synthesizer module does not have to be removed or opened for adjustment. R49

is the potentiometer closest to the center of the synthesizer module and R50 is towards

the edge of the synthesizer module.

(5) Set the 1024 for DIRECT, FULL PWR operation ( 100 watt output).

(6) Adjust R50 on the synthesizer down converter card in the 5030-1101 module

(1A1A2R50) for an RF output of 120 watts at 4011-J7.

(7) If adjustment of R49 and R50 cannot bring the transmitter to the required

level, refer to figure 5-3.

1. Turn off power on 1024 and 4011 and replace cables removed in step a.

5-8