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TM 11-5820-890-30-5
3-17. OPERATIONAL CHECK. Continued
Step 2. TRANSMIT/RECEIVE SC AUDIO CHECK. Continued
Action
Response
b. Set PTT: UUT.
b. Scope CHAN A displays a 15 to 20 V p-p,
900 to 1100 Hz sine wave. If not,
go to chart 4.
c. Set STIMULUS: 3.
c. Scope CHAN A displays a 15 to 20 V p-p,
Set RESPONSE: 1.
900 to 1100 Hz sine wave. If not, the
Set PTT: REF.
RT is bad. See chapter 2.
d. Set CHAN switch on REF RT and UUT RT
d. Scope CHAN A displays a 15 to 20 V p-p,
to each position (at the same time).
900 to 1100 Hz sine wave. If not, the
Set PTT: REF (for each channel),
RT is bad. See chapter 2.
Step 3. XMT DIGITAL DATA CHECK.
Action
Response
a. Set CAL: FCTN GEN
a.
Scope CHAN B and frequency counter
LEVEL: 10 V p-p
will display function generator calibration.
(9 to 11 v p-p)
FREQ: 2400 Hz
(2390 to 2410 Hz)
FUNCTION: SINE.
Set CAL: OFF.
Set FCTN GEN TRIGGER: EXT TRIG
TRIG LEVEL: MID-RANGE.
b. Set STIMULUS: 2
b. No response.
LOAD:
OFF
BASEBAND: 1.
Set REF RT and UUT RT: DATA: 4.8 K
RESPONSE: 3.
c. Set PTT: UUT.
c. Scope CHAN A displays a 9.5 to 10.5 V
p-p, 2390 to 2410 Hz square wave. If not,
the RT is bad. See chapter 2.
3-32
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