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|  TM 11-5820-670-30
2-8. MAXIMUM SIGNAL PLUS NOISE-TO-NOISE RATlO TEST. (CONT)
INITIAL EQUIPMENT CONTROL SETTlNGS
Set equipment controls as indicated in the following table.
CONTROL AND SWITCH SETTINGS
POSITION/SETTING
EQUIPMENT
CONTROL OR SWITCH
T/R
MODE SWITCH
TS-2575/ARC-131
VOL
Maximum (clockwise)
DIS
SQUELCH
FREQ set
30.00 MHz
FUNCTION switch
SET LEVEL
TS-723A/U
Meter RANGE
+20
AF
AF-RF switch
RANGE
X 10
Adjust to 30 MHz.
BAND SWITCH and RF TUNING CONTROL
AN/URM-103
FUNCTION switch
LO 0-10 KUV
LO-HI RF SET to LINE control and LO
RF UV
Adjust for 100 microvolt.
10
DEVIATION RANGE KHZ switch
Midrange position
DEVIATION control
Freq dial
10
AN/URM-127
FREQ RANGE MULTIPLIER
X 100
As required to produce 8 kHz
OUTPUT CONTROL
deviation on AN/URM-103.
TEST PROCEDURE
1. Adjust AN/URM-127 output level for 8 kHz deviation as indicated on AN/URM-103 modulation
meter.
2. Adjust AN/URM-103 output for a 30.00 MHz, 200 microvolt signal.
3. Adjust input sensitivity control on TS-723A/U Spectrum Analyzer for a 0 db reference in meter.
4. Remove modulation from AN/URM-103 by disconnecting AN/URM-127 output.
5. Observe TS-723A/U indication in db below reference level established in step 3.
STANDARD. 45 db minimum
6. If spectrum analyzer does not indicate a minimum of 45 db, see troubleshooting chart 2-10.
7. Repeat steps 1 through 6, adjusting TS-2575/ARC-131 for each of the following frequencies:
41.00 MHz, 52.00 MHz, 53.00 MHz, 65.00 MHz, and 75.95 MHz.
2-15
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