Step 5. TRANSMITTER CHECKS *

TM 11-5820-890-20-3

3.1.

OPERATIONAL CHECK. Continued

ACTIONS

CHECKS

STEPS

N/A

5.1 Remove RF cable from RT ANT

N/A

Connect test set cable from

test set RADIO to RT ANT.

N/A (See following SC

N/A

Connect vehicular antenna

Test Setup diagram.)

cable to test set ANT

Set test set:

N/A

MODE to FWD PWR

Set RT:

N/A

FCTN to SQ ON

N/A

CHAN to 1

N/A

MODE to SC

N/A

COMSEC to CT

YES: Go to Step 5.3

Test set FWD PWR reads

5.2 Press PTT and PTTest

26 W?

NO:

Go to TS Guide 12

YES: Go to Step 5.4

5.3 Set test set MODE to RVS PWR Test set reads no more

NO:

Go to TS Guide 12

than l/3** of FWD PWR?

Press PTT and PTTest

RT SIG display reads

YES: Go to Step 5.5

5.4 Press PTT

Replace RT

NO:

4 or more?

YES: Go to Step 5.6

Test set reads no more

5.5 Set RT CHAN to 2

NO:

Go to TS Guide 12

Repeat Steps 5.2 & 5.3

than l/3** of FWD PWR?

YES: Go to Step 5.7

Test set reads no more

5.6 Set RT CHAN to 3

NO:

Go to TS Guide 12

Repeat Steps 5.2 & 5.3

than l/3** of FWD PWR?

YES: Go to Step 5.8

5.7 Set RT CHAN to 1

Sidetone heard?

NO:

Got to TS Guide

Press PTT, count into HS

YES: Go to Step 5.9

Test set reads

5.8 Set test set MODE to FREQ

Press PTT and PTTest

40998 41002?

NO:

Replace RT

5.9 Set RT CHAN to 2

Test set reads:

YES: Go to Step 5.10

NO:

Replace RT

Press PTT and PTTest

53998 54002?

Test set reads:

YES: Go to Step 5.11

5.10 Set RT CHAN to 3

Press PTT and PTTest

74998 75002?

NO:

Replace RT

5.11 Set RT FCTN to RXMT

N/A

Connect HS to RT RXMT

N/A

Listen at HS

Rushing noise heard

YES: Go to Step 5.12

at HS?

NO:

Replace RT

YES: Go to STEP 6

5.12 Press PTT

SIG display reads

4 or more?

NO:

Replace RT

* Skip this step if the tactical situation or your unit SOP precludes transmitting. If unit SOP or tac

tical situation prohibits transmitting, use dummy load and realize that antenna cannot be checked.

** If radio is used for data transmission, use 1/4 rather than 1/3 for these checks.