TM 11-5821-333-30
6-20. OPERATIONAL CHECK. Continued
ACTION
RESPONSE
Step 5. REFERENCE RT RF OUTPUT TEST. Continued
c. Set PTT switch (S8) to REF. Repeat for each
c.
PRESET switch position.
d. Disconnect DMM rf probe and setup from
d.
J10. Connect frequency counter to J10, and
set to 50 ohms for measuring frequency.
e. Set PTT switch (S8) to REF. Repeat for each
e.
ref rt PRESET switch position.
Step 6. REFERENCE RT SC XMT AUDIO TEST
DMM reading is 17 to 23 dBm for each PRE-
SET switch position. If not, go to chart 5.
No response.
Frequency counter readings for each PRESET
switch position are:
PRESET
FREQUENCY (Hz)
MAN
29999700 to 30000300
1
35874640 to 35875360
2
39974600 to 39975400
3
47174530 to 47175470
4
54999450 to 55000550
5
55699440 TO 55700560
6
71999280 TO 72000720
CUE
87599120 TO 87600880
If any are wrong, ref rt is bad.
Presets:
SET REF RT–
SET TEST ADAPTER–
PRESET: MAN
S3: 2
CAL(S7) : IN
CONNECT–
TEST EQPT INPUT(S14) : EXT
JUMPER W1 FROM J10 TO J11
FREQUENCY COUNTER TO J19
SET FUNCTION GENERATOR–
FUNCTION: SINE
FREQ: 1 kHz (900 to 1100 Hz)
LEVEL: 1.0 V P-P (0.9 to 1.1 V P-P)
Connect X1 probe to TP11, set PTT switch
Scope channel 1 displays sine wave:
(S8) to REF, and hold.
1 kHz (900 to 1100 Hz)
4.0 V P-P (2.0 to 6.0 V P-P)
If not, go to chart 6.
6-168
