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TM 11-5820-890-30-5
2-29. OPERATIONAL CHECK. Continued
Step 11. RECEIVE CHECK (SC, AUDIO, CT).
Action
Response
a.
Set LOGIC:
OFF
a.
No response.
CAL:
FCTN GEN
FREQ: 1000 Hz (900 to 1100 Hz)
LEVEL: 120 mV p-p (100 to 140 mV p-p)
FUNCTION: SINE.
b. Set CAL:
OFF
b. No response.
STIMULUS: 3
RESP SEL: S2
RESPONSE : 1.
c.
Set PTT: REF.
c.
Scope chan A displays a 4.5 to 6.5 V
p-p, 900 to 1100 Hz sine wave + the
150-Hz squelch tone. If not, the switching
module (1A7) is bad.
d. Set RESP SEL: S1.
d.
No response.
Set LOGIC:
1.
Jumper TP1 to TP2.
e. Set PTT: REF.
e.
Scope chan A displays a 4 to 6 V p-p,
900 to 1100 Hz sine wave. Some of the
150-Hz squelch tone may be present. If
not, go to chart 26.
Step 12. TRANSMIT CHECK (SC, 4.8K DATA).
Action
Response
a.
Set LOGIC:
OFF.
a.
No response.
Remove jumper between TP1 and TP2.
b. Set CAL:
FCTN GEN
b. No response.
FREQ: 2400 Hz (2390 to 2410 Hz)
LEVEL: 10 V p-p (9.5 to 10.5 V p-p)
FUNCTION:
SQUARE
NOTE
TRIGGER:
EXT TRIG
Do not change FCTN GEN settings from
TRIG LEVEL: MID-RANGE.
these settings until required again.
Set CAL:
OFF.
c.
Set STIMULUS: 2
c.
No response.
RESPONSE: 3
BASEBAND: 1.
Set REF RT and UUT RT: DATA: 4.8 K.
d. Set PTT: UUT.
d. Scope chan A displays a 9 to 11 V p-p,
2390 to 2410 Hz square wave. If not,
go to chart 27.
e. Set PTT: OFF.
e.
No response.
2-40
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