TM 11-5820-890-30-4
12-23. OPERATIONAL CHECK. Continued
Step 9. TRANSMIT DIGITAL DATA TEST. Continued
Action
Set test adapter:
PTT: OFF.
Set REF RT and RCU:
COMSEC:
Set test adapter:
PTT: UUT.
Set test adapter:
PTT: OFF.
Disconnect WI cable from RF Signal
Generator FM I/O connector and connect
to Function Generator MOD OUT connector,
Connect unconnected WI cable from
Function Generator FCTN OUT connector
to RF Signal Generator FM I/O connector.
Response
Scope is locked-up on CH 1 at same
frequency as CH 2. If not, go to chart 35.
No response.
No response.
No response.
Step 10. RECEIVE DIGITAL DATA TEST.
SET:
REF RR
TEST ADAPTER:
FUNCTlON GENERATOR:.
RF SIGNAL GENERATOR:
FCTN: REM
RESPONSE: 1
TRIGGER: CONT
FM DEVIATION: 4 to 5 kHz
Action
a. Adjust fine frequency control on Function
Generator until scope CH 1 is locked-up.
b. Disconnect W1 cable from RF Signal
Generator FM I/O connector.
Response
a. Adjustment is successful and scope is
locked-up on CH 1 at same frequency as
CH 2. If not, go to chart 36.
b. No response.
12-39
