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TM 11-5820-890-30-5
3-17. OPERATIONAL CHECK. Continued
Step 7. RECEIVE FH AUDIO CHECK.
Action
Response
a. Connect ECCM fill device to RT AUD/FILL
a. UUT RT responds correctly, If not, the RT
connector. Load RT with fill data.
is bad. See chapter 2.
b. Load both RTs with the same FH sync
b. UUT RT responds correctly. If not, the RT
time.
is bad. See chapter 2.
c. Set REF RT and UUT RT:
c. No response.
RF:
LO
MODE: FH
FCTN:
SQ, ON
DATA: OFF
CHAN: Channel with hopsets loaded.
d. Set CAL: FCTN GEN
d. Scope CHAN B and frequency counter
LEVEL: 140 mV p-p
will display function generator calibration.
(130 to 150 mV p-p)
FREQ: 1000 Hz
(900 to 1100 Hz)
FUNCTION: SINE
Set CAL: OFF.
e. Set LOAD:
1
e. No response.
BASEBAND: 3.
f. Set PTT: REF.
f. Scope CHAN A displays a sine wave great-
er than a 15 V p-p, 900 to 1100 Hz sine
wave with some distortion. If not, the RT
is bad. See chapter 2.
Step 8. TRANSMIT FH AUDIO CHECK.
Action
Response
a. Set STIMULUS: 1
a. No response.
Set RESPONSE: 3.
b. Set PTT: UUT.
b. Scope CHAN A displays a distorted sine
wave greater than a 15 V p-p, 900 to
1100 Hz sine wave. If not, the RT is bad.
See chapter 2.
c. Set PTT: OFF.
c. No response.
3-34
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