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OPERATIONAL CHECK
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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 6. RECEIVER CHECKS


TM 115820890203
2.1.
OPERATIONAL CHECK. Continued
Step 5. TRANSMITTER CHECKS
ACTIONS
STEPS
CHECKS
N/A
N/A
5.1 Remove antenna from RT
N/A (See Typical SC Test
N/A
Connect RF cable from test set
Setup diagram following)
RADIO to RT ANT
N/A
N/A
Connect test set ANT to
dummy load
N/A
N/A
Set test set MODE to FWD PWR
Set RT:
N/A
N/A
FCTN . to SQ ON
N/A
N/A
CHAN to 1
N/A
N/A
MODE to SC
N/A
N/A
RF PWR to HI
YES: Go to Step 5.3
Test set reads
5.2 Press PTT and test set PTTest
NO:
2 W or greater?
Go to TS Guide 2
YES: Go to Step 5.4
5.3 Press PTT
SIG display reads
4 or more?
NO:
Replace RT
YES: Go to Step 5.5
5.4 Repeat above check for CHAN 2
SIG display reads
4 or more?
NO:
Replace RT
SIG display reads
YES: Go to Step 5.6
5.5 Repeat above check for CHAN 3
4 or more?
NO:
Replace RT
N/A
N/A
5.6 Set RT CHAN to 1
Press PTT, count into HS
Sidetone heard?
YES: Go to Step 5.7
NO:
Replace RT
YES: Go to Step 5.8
5.7 Set test set MODE to FREQ
Test set reads
Press PTT and PTTest
40998 to 41002? NO:
Replace RT
N/A
N/A
5.8 Set RT CHAN to 2
Press PTT and PTTest
Test set reads
YES: Go to Step 5.9
53998 to 54002?
NO:
Replace RT
5.9 Set RT CHAN to 3
N/A
N/A
Press PTT and PTTest
Test set reads
YES: Go to Step 5.10
74998 to 75002?
NO:
Replace RT
5.10 Set RT FCTN to RXMT
N/A
N/A
N/A
Connect HS to RT RXMT
N/A
Listen at HS
Rushing noise
YES: Go to Step 5.11
heard?
NO:
Replace RT
5.11 Press PTT
RT SIG display
YES: Go to Step 5.12
reads 4 or more? NO:
Replace RT
5.12 Set RT FCTN! to SQ ON
N/A
N/A
N/A
Connect HS to RT AUD/DATA
N/A
Remove RF cable from RT ANT
N/A
N/A
N/A
N/A
Connect antenna to RT ANT
Press PTT, count into HS*
Sidetone heard
YES: Go to STEP 6
in HS?
NO:
Go to TS Guide 3
* If unit SOP or tactical situation prohibits transmitting, use dummy load and realize that antenna
cannot be checked.
23


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