Specifications

TM 11-5820-670-30
2-6. AUDIOFREQUENCY RESPONSE AND FRONT PANEL METER TEST. (CONT)
EQUIPMENT
AN/URM-127
TS-723A/U
TEST PROCEDURE
1.
2.
3.
4.
CONTROL AND SWITCH SETTINGS (CONT)
CONTROL OR SWITCH
LO-HI RF SET to LINE CONTROL and LO
RF UV
DEVIATION RANGE KHZ switch
DEVIATION control
Freq dial
FREQ RANGE MULTIPLIER
OUTPUT CONTROL
POSITION/SETTING
Adjust for 10 microvolt.
10
Midrange position
10
X 1K
Adjust as indicated in test
procedure.
Adjust as indicated in test
procedure.
Determine that RECEIVER AUDIO OUTPUTS J107 HI-LO on test set is connected to AF INPUT
terminals of TS-723A/U.
Set TS-723A/U function switch to SET LEVEL position and adjust input sensitivity control to pro-
vide a 0 db reference.
Change output frequency of AN/URM-127 to 500 Hz, and adjust output for 8 kHz deviation as
indicated on AN/URM-103 modulation meter.
Observe audio output change in db from the 1000 Hz reference (step 2).
STANDARD. ± 2 db
5. If audio output change is not within ± 2 db, see troubleshooting chart 2-8.
6. Repeat procedures 2,3, and 4 using audiofrequencies of 2000, 3000, 300, 5000, and
10,000 Hz.
STANDARD. ± 2 db
7. If audio output change is not within ± 2 db, see troubleshooting chart 2-8.
8. Disconnect cable CG-3371/U (W7) from NORMAL J107 and reconnect to WIDEBAND J108 on
test set.
9. Repeat procedures 2 through 5.
2-10