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|  TM 11-5826-257-24
CAUTION
FREQ. RANGE
X10
MULTIPLIER
Disconnect Cable CG-409/U and CG483/U
F r e q u e n c y control 40
from the AN/ARM-69 DEMOD and MOD
FREQ. METER
jacks except while performing the warn-
ON
switch
ing signal test. Maintain approximately
POWER switch
ON
22.5 percent modulation (each tone) on
the AN/ARM-5.
RF Signal Generator AN/USM-44
ON
Power switch
5 mv. (33 dbm)
ATTEN.
(2) Set the AN/ARM-5 MODULATION switch
EXT MOD
MOD SELECTOR
to 90~.
C (42-90 MHz)
FREQUENCY
(3) Adjust the AN/ARM-5 90~ MOD control
Adjust to 75 MHz
RANGE
for 22.5 on %M meter. The AN/ARM-92B FLAG
(using Electronic
FREQUENCY
meter must indicate less than 180 microamperes.
Counter, Digital
(4) Set the AN/ARM-5 MODULATION switch
Readout AN/USM-
to 150~.
207)
(5) Adjust the AN/ARM-5 150~ MOD control
Peak on meter
AMP. TRIMMER
for 22.5 on %M meter. The AN/ARM-92B FLAG
SET LEVEL (red
OUTPUT LEVEL
meter must read less than 180 microamperes.
arrow)
(6) Connect Cable CG-409/U between AN/
80%
MOD LEVEL
ARM-5 DEMOD jack and AN/ARM-69 DEMOD
Audio Output Meter TS-585/U
jack.
X1, 150
10
MULTIPLY BY
(7) Connect Cable CG-433/U between AN/
ARM-5 EXT MOD terminals and AN/ARM-69
MOD jack.
c. Marker Test Signal. The marker test signal
is a 75-MHz rf carrier amplitude modulated 80
(8) Set the AN/ARM-5 MODULATION switch
percent by a single tone of 400 Hz, 1300 Hz, or
to AMP LOC
3000 Hz.
(9) Set the AN/ARM-5 DEMOD adjust
(screwdriver adjustment) for 80 on %M meter.
d. Audio Output Power Test.
The AN/ARM-92B FLAG meter must indicate 220
(1) Adjust the AN/USM-44 FREQUENCY
microamperes minimum.
control for a peak reading on Audio Output Meter
TS-585/U.
4-17. Marker Beacon Bench Test.
(2) Adjust the AN/USM-44 ATTEN. dial until
the blue lamp (outer) on the AN/ARM92B glows
a. Test Setup. the marker beacon bench tests
are performed with the test setup shwon in figure
dimly.
(3) Note the reading in millivolts on the AN/
USM-44 ATTEN. dial; then adjust the ATTEN.
b. Initial Switch Settings. Before performing
dial to 10 times the noted reading.
the marker beacon bench test procedures, set the
controls of all items of test equipment as follows:
(4) The TS-585/U must indicate at least 40
Radio Test Set AN/ARM-92B
milliwatts.
OFF/PWR/TEST
PWR
e. Lamp Actuation Test.
MODE
400 HZ
BEARING control
0
(1) Adjust the AN/URM-127 frequency con-
BEARING switch
BRG
trol to 40 (400 Hz).
FLAG LOAD
4
(2) Adjust the AN/USM-44 ATTEN. dial to 50
SENS
LO
millivolts.
IND TEST
GS RCVR
DEVIATION
0
(3) Check to see that the blue OUTER marker
CONTROL
lamp on the AN/ARM-92B lights. The amber and
frequency
109.30
white lamps must not light.
AUDIO
MB
(4) Adjust the AN/URM127 frequency con-
Audio Oscillator AN/URM-127
trol to 130 (1300 Hz).
ATTENUATOR
X.1
OUTPUT CONTROL Midrange
(5) Check to see that the amber MIDDLE
4-8
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