TM 11-5820-890-30-4
12-23. OPERATIONAL CHECK. Continued
Step 11. RECEIVE FREQUENCY HOP VOICE TEST.
SET:
RCU:
TEST ADAPTER:
RF SIGNAL GENERATOR:
DATA: OFF
MOD GEN: OFF
RF: OFF
VOL: FULLY CW
CAL:
MOD GEN
FREQ:
1000 Hz (900 to 1100 Hz)
FUNCTION GENERATOR:
FCTN:
SINE
FM/SWP:
INT
CAL:
FCTN GEN
MOD AMPLITUDE: MIN
FREQ:
40 kHz (39,900 to 40,100 Hz)
LEVEL:
400 mV p-p (350 to 450 mV p-p)
FCTN:
SINE
CAL:
OFF (scope trig. CH 1)
BASEBAND: 3
STIMULUS: 6
Action
a. Adjust function generator MOD AMPLITUDE
until 1 kHz, 15 to 18 V p-p sine wave is
displayed on scope CH 1.
Reduce RCU:
VOL until sine wave is 10 V p-p.
Set RCU:
MODE: FH.
Observe scope CH 1.
b. Set RCU:
MODE:
Observe scope CH 1.
c. Press RCU: lll /TIME key.
d. Connect RF probe to DMM. Set DMM to
read dB (50 ohms).
Response
a. 10 to 20 V p-p distorted sine wave is
displayed on CH 1. If not, go to chart 37.
b. Same 10 to 20 V p-p distorted sine wave
is displayed on CH 1. if not, go to chart
38.
c. RCU display reads:
If not, go to chart 20.
d. No response.
12-40
