TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 10. REFERENCE RT SQUELCH TEST
a.
b.
Set test adapter–
a.
No response.
S1:3
TEST EQPT INPUT (S14) : INTL
Watch scope while turning ref rt FUNCTION
b. Scope channel 1 displays an 8.0 V P-P (5 to
switch from SQ OFF to SQ ON.
11 V P-P) signal when FUNCTION switch is set
to SQ OFF, and O V P-P when FUNCTION
switch is set to SQ ON.
If not, go to chart 8.
Step 11. REFERENCE RT RCV SENSITIVITY TEST
Presets:
SET REF RT–
SET SIGNAL GENERATOR–
FUNCTION: SQ OFF
FREQ: 30 MHz
LEVEL: -90 dBm
FM MODE: INT
MODULATION: 1 kHz at 6 to 7 kHz deviation
Watch scope channel 1 when the following
Scope channel 1 displays sine wave for each
settings are made:
PRESET position:
1 kHz (900 to 1100 Hz)
REF RT
RF SIGNAL
8.0 V P-P (5 to 11 V P-P)
PRESET
GENERATOR FREQ
If not, ref rt is bad.
MAN
30.000 MHz
4
55.000 MHz
5
55.700 MHz
CUE
87.600 MHz
Step 12. RT-1476 REFERENCE RT FILL TEST
Presets:
SET REF RT–
SET ECCM FILL DEVICE–
FUNCTION: STOW, THEN Z-A, THEN LD-V
FUNCTION: OFF
PRESET: 1
SELECT: T1 OR T2
MODE : FH
CONNECT ECCM FILL DEVICE–
SET TEST ADAPTER–
REF RT FILL CONNECTOR
S1: OFF
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