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|  TM 11-5820-670-30
2-15. TRANSMITTER SIGNAL PLUS NOISE-TO-NOISE RATlO TEST. (CONT)
INITIAL EQUIPMENT CONTROL SETTINGS
Set equipment controls as indicated in the following table.
CONTROL AND SWITCH SETTINGS
POSITION/SETTING
CONTROL OR SWITCH
EQUIPMENT
LO
XMTR HI-LO
RT-823/ARC-131
T/R
MODE SWITCH
TS-2575/ARC-131
Maximum (clockwise)
VOL
DIS
SQUELCH
30.00 MHz
FREQ sel
LO
HI-LO switch
OFF
TRANSMIT switch
10
Freq dial
AN/URM-127
X 1000
FREQ RANGE MULTIPLIER
As specified in procedure.
OUTPUT CONTROL
30.00 MHz
TUNING
ME-30(E)/U
20
DEVIATION RANGE KC
20-55 MHz
FREQUENCY RANGE MC
TUNE
Selector switch
SET LEVEL
FUNCTION switch
TS-723A/U
X 10
RANGE
AF
AF-RF SWITCH
1
Transmit-lnterphone selector
C-1611 D/AIC
ON
RECEIVER 1 switch
PROCEDURE
1. Adjust AN/URM-127 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. Adjust TS-723A/U signal INPUT control for 0 db reference on meter.
4. Remove the modification from the receiver/transmitter by disconnecting AN/URM-127 from test
set J104 HI-LO terminals.
5. Observe difference in TS-723A/U meter indication from the 0 db reference established in
step 3.
STANDARD. 35 db difference
6. If meter indication on spectrum analyzer does not indicate 35 db, see troubleshooting
chart 2-18.
2-31
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