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TM 11-5820-890-30-5
2-29. OPERATIONAL CHECK. Continued
Step 10. TRANSMIT CHECK (SC, AUDIO, CIPHER TEXT).
Action
Response
a.
Set REF RT and UUT RT:
a.
No response.
RF:
LO
FCTN:
SQ ON
CHAN:
MAN
MODE:
SC
DATA :
OFF
VOL:
FULLY CW.
Set TEST EQPT SELECTOR: SCOPE
CAL:
FCTN GEN
FREQ: 1000 Hz (900 to 1100 Hz)
LEVEL: 120 mV p-p (100 to 140 mV p-p)
FUNCTION: SINE
CAL:
OFF
STIM SEL:
FCTN GEN
RESPONSE: 11.
b. Set PTT: UUT.
b. Scope chan A displays a 1.5 to 2.5 V
p-p, 900 to 1100 Hz sine wave. If not,
go to chart 24.
c.
Set PTT: OFF.
c.
No response.
d. Set RESPONSE: 3.
d. Scope chan A will display audio from the
Set PTT: UUT.
REF RT.
e.
Set PTT: OFF.
e.
No response.
f.
Set LOGIC:
1.
f.
No signal is present on scope than A. If
Set PTT: UUT.
signal is present, go to chart 25.
g.
Set PTT: OFF.
g.
No response.
Disconnect RF probe from DMM.
Connect W1 to DMM.
Set DMM to 200 k W scale.
Set TEST EQPT SELECTOR: DMM.
h. Set RESPONSE: 10.
h.
DMM reading is 9 to 11 k W. If not, the
audio control module (1A13) is bad.
i.
Set RESPONSE: 9.
i.
DMM reading is 200 to 400 k W. If not,
Set DMM to 20 M W scale.
the audio control module (1A13) is bad.
j.
Set RESPONSE: 8.
j.
DMM reading is W. If not, the
audio control module (1A13) is bad.
k. Set DMM to 200 W scale.
k.
DMM reading is less than 200 W. If not,
Set PTT: UUT.
the audio control module (1A13) is bad.
l.
Set PTT: OFF.
l.
No response.
Set REF RT and UUT RT:
CHAN:
1.
m. Set CAL:
FCTN GEN
m. No response.
FREQ: 8000 Hz (7990 to 8010 Hz)
LEVEL: 10 V p-p (9.5 to 10.5 V p-p)
FUNCTION: SQUARE
CAL:
OFF.
n.
Set TEST EQPT SELECTOR: SCOPE
n.
Scope chan A displays a 200 to 400 mV
LOGIC:
2
waveform. Single trace is sine wave.
STIMULUS: 5
Total waveform is modulated. If not, the
RESPONSE: 3.
switching module (1A7) is bad.
2-39
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