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|  TM 11-5820-670-30
2-14. TRANSMllTER DISTORTION NARROW BAND TEST. (CONT)
INITIAL EQUIPMENT CONTROL SETTlNGS
Set equipment controls as indicated in the following table.
CONTROL AND SWITCH SETTINGS
POSITION/SETTING
CONTROL OR SWITCH
EQUIPMENT
T/R
MODE SWITCH
TS-2575/ARC-131
Maximum (clockwise)
VOL
DIS
SQUELCH
30.00 MHz
FREQ sel
OFF
TRANSMIT switch
LO
HI-LO switch
10
Freq dial
AN/URM-127
X 100
FREQ RANGE MULTIPLIER
As specified in test
OUTPUT CONTROL
procedure.
TUNING
30 MHz
ME-57/U
20
DEVIATION RANGE KC
20.55 MHz
FREQUENCY RANGE MC
TUNE
Selector switch
FUNCTION switch
DISTORTION
TS-723A/U
X 10
RANGE
AF
AF-RF switch
Transmit-lnterphone selector
1
C-1611 D/AIC
ON
RECEIVER 1 switch
TEST PROCEDURE
1. Adjust AN/URM-27 OUTPUT CONTROL for a 0.39 volt output level as indicated on ME-30(E)/U
2. Place test set TRANSMIT switch to ON.
3. Measure transmitter distortion at the output of ME-57/U.
STANDARD. 10 percent maximum
4.
If reading on modulation meter is above 10 percent, see troubleshooting chart 2-17.
5.
Set test set TRANSMIT switch to OFF.
6.
Set test set FREQ sel to 75.95 MHz.
7.
Repeat steps 1 through 5.
2-29
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