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TM 11-5820-890-30-5
2-29. OPERATIONAL CHECK. Continued
Step 17. RECEIVE CHECK (SC, AD2).
Action
Response
a.
Set BASEBAND: 5
a.
No response.
STIMULUS: 3
RESPONSE: 1.
Set TEST EQPT INPUT:
INT.
b. Set PTT: REF.
b. Scope chan A displays a slightly distorted
1.5 to 2.5 V p-p, 2390 to 2410 Hz sine
wave. If not, go to chart 34.
Step 18. RETRANSMIT CHECK.
Action
Response
a. Set RT (UUT and REF) DATA: OFF.
a.
No response.
Set UUT RT:
FCTN :
RXMT.
Disconnect cable at UUT RT AUDIO/DATA
connector and move it to UUT RT RXMT
connector.
b. Set CAL:
FCTN GEN
b. No response.
FREQ: 1000 Hz (990 to 1100 Hz)
LEVEL: 120 mV p-p (100 to 140 mV p-p)
FUNCTION:
SINE.
Set CAL:
OFF.
c.
Set BASEBAND: 3.
c.
No response.
Set TEST EQPT INPUT:
INT.
d. Set PTT: REF.
d. Scope chan A displays a 560 to 700 mV
p-p, 900 to 1100 Hz sine wave. If not, go
to chart 35.
e. Set TEST EQPT SELECTOR: DMM.
e.
DMM reading is -0.5 to 0.5 V dc. If not,
Set RESPONSE: 5.
go to chart 35.
Set PTT: REF.
f.
Set RESPONSE: 6.
f.
DMM reading is 1.0 to 3.0 V dc. If not,
the switching module (1A7) is bad.
g. Set RESPONSE: 4.
g.
DMM reading is 1.0 to 3.0 V dc. If not,
the switching module (1A7) is bad.
2-43
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