TM 11-5821-333-30
2-23. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 6. RECEIVER SENSITIVITY TEST
a, Set test adapter switches:
a. No response.
PTT(S8)
S1
TEST EQUIPMENT
SELECTOR
b. Set uut FUNCTION
OFF
7
SCOPE
switch to SQ OFF.
c. Set uut VOL control fully right.
d. Set frequency counter input to 1 megohm.
e. Set rf signal generator:
Modulation
1 kHz, INT, FM
Deviation
6.5 kHz
Output level
-86 dBm
f.
Read scope at following settings of uut and
signal generator:
UUT
Rf Signal
PRESET Switch
Gene ator(MHz)
MAN
30.000
4
55.000
5
55.700
CUE
87.600
g. If uut is not RT-1476 or RT-1476A, go to step
7.
h. If uut is RT-1476 or RT-1476A, set uut VOL
control fully left.
Step 7. SQUELCH CHECK
a.
b.
c.
Set test adapter:
S1
5
TEST EQUIPMENT
SELECTOR
ICS
Set uut VOL control fully right,
Move uut FUNCTION switch between SQ ON
and SQ OFF while listening to headset.
b. No response.
c. No response.
d. No response,
e. No response,
f, Scope displays 5 to 11 V peak-to-peak
noise free sine wave. If not, go to chart
13 (see waveform),
g. No response.
h. Scope displays less than 1 V peak-to-peak
sine wave.
If not, front panel (Al) is bad.
a. No response.
b. No response.
c. Noise present at SQ OFF; no noise at SQ
ON. If not go to chart 14.
2-23
