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TYPICAL SC TEST SETUP
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TM-11-5820-890-20-3 Ground ICOM Radio Sets AN/PRC-119A AN/VRC-87A AN/VRC-88A AN/VRC-89A AN/VRC-90A AN/VRC-91A AN/VRC-92A Manual
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Step 8. LS-671 CHECKS


TM 11-5820-890-20-3
3.1.
OPERATIONAL CHECK. Continued
Step 7. POWER AMPLIFIER CHECKS *
ACTIONS
STEPS
CHECKS
7.1 Connect vehicular antenna
N/A
N/A
cable to test set ANT
N/A
N/A
Connect W2 cable to
RT ANT and PA J2
N/A
N/A
Set test set:
MODE to FWD PWR
N/A
N/A
Connect test set cable from
test set RADIO to PA J1
N/A
Set RT CHAN to 1
N/A
YES: Go to Step 7.3
7.2 Press PTT and PTTest
Test set reads
NO:
Go to TS Guide 14
2W or greater?
7.3 Set RT RF PWR to PA
N/A
N/A
Press PTT and PTTest
YES: Go to Step 7.4
Test set reads 30 W or
RTA; Go to TS Guide 15
greater?
NO:
RT B; Go to TS Guide 16
7.4 Set RT CHAN to 2
N/A
N/A
Press PTT and PTTest
Test set reads 30 W or  YES: Go to Step 7.5
NO:
RTA; Go to TS Guide 17
greater?
RT B; Go to TS Guide 18
7.5 Set RT CHAN to 3
N/A
N/A
Press PTT and PTTest
Test set reads 30 W or  YES: Go to Step 7.6
greater?
NO:
RTA; Go to TS Guide 17
RT B; Go to TS Guide 18
7.6 Press PTT and
Sidetone heard at HS?
YES: Continue
count into HS
NO:
Replace PA
RT SIG display
YES: Go to STEP 8
reads 6 or 7?
NO:
Go to TS Guide 19
* If unit SOP or tactical situation prohibits transmitting, use dummy load and realize that antenna
cannot be checked.
3-7


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