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|  TM 11-5820-670-30
2-12. TRANSMITTER TONE MODULATION TEST. (CONT)
CONTROL AND SWITCH SETTlNGS
POSITION/SETTING
CONTROL OR SWITCH
EQUIPMENT
T/R
MODE SWITCH
TS-2575/ARC-131
Maximum (clockwise)
VOL
DIS
SQUELCH
75.95 MHz
FREQ sel
OFF
TRANSMIT switch
75.95 MHz
TUNING
ME-57/U
20
DEVIATION RANGE KC
55-120
FREQUENCY RANGE MC
TUNE
Selector switch
1
Transmit-lnterphone selector
C-1611 D/AlC
ON
RECEIVER 1 switch
TEST PROCEDURE
1. Set test set TRANSMIT switch to ON and measure frequency and deviation of 150 Hz transmitter
tone signal.
STANDARD. frequen - 148 HZ to 152 HZ
deviation 2.5 kHz to 3.5 kHz
2. If frequency and deviation are not within tolerances of the standard, see troubleshooting
chart 2-15.
3. Set test set SQUELCH switch to CARR.
STANDARD. frequen 148 Hz to 152 Hz
deviation 2.5 kHz to 3.5 kHz
4. If frequency and deviation are not within the tolerances of the standard, see troubleshooting
chart 2-15.
5. Set test set SQUELCH switch to TONE and measure the frequency and deviation of the 150 Hz
transmitter tone signal.
STANDARD. frequen 148 kHz to 152 HZ
deviation 2.5 kHz to 3.5 kHz
6. If frequency and deviation are not within tolerances of the standard, see troubleshooting
chart 2-15.
2-25
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