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|  TM 11-5826-258-24
meter.
OFF
OFF/PWR/TEST
(9) Set MD-83A/ARN TONE LOCALIZER switch
MODE
400 HZ
to CAL 150~. The SG-lA/ARN PERCENT MODULA-
0
BEARING control
TION meter should indicate 20%.
BEARING switch
BRG
NOTE
FLAG LOAD
4
If a 20 percent indication is not obtained in
LO
SENS
the preceding step, open the potentiometer
IND TEST
GS RCVR
door on the MD-83A/ARN front panel and
0
DEVIATION
adjust the 150~ potentiometer for a 20% in-
109.30
CONTROL frequency
dication on the SG-lA/ARN PERCENT
Radio Test Set AN/ARM-5
MODULATION meter.
POWER
STAND BY
(10) Set SG-lA/ARN MOD RANGE switch to
0
OMNI TRACK
100%.
AMP LOC
MODULATION
(11) Set MD-83A/ARN TONE LOCALIZER to 0.
IDENTIFIER
OFF
d. LOC Centering Test.
0
ATTENUATOR
(1) Set up a standard LOC test signal (para 3-20a,
B
MC
b, and c).
Frequency Converter AN/ARM-69
(2) The AN/ARM-92B DEVIATION meter shall
POWER
OFF
indicate 0 10 microamperes.
FREQ MC
332.0
e. LOC Sensitivity Test.
(1) Set up a standard LOC teat signal.
c. Glideslope Test Signal. The glideslope teat signal
(2) Set the MD-83A/ARN TONE LOCALIZER to
is an rf carrier amplitude-modulated 22.5 percent by a
4DB (right side) for 90 Hz predomination.
90-Hz signal and 22.5 percent by a 150-Hz signal. The
(3) The AN/ARM-92B DEVIATION meter shall
rf carrier supplied by Radio Teat Set AN/ARM-5 is
indicate between 70 and 110 microampere right of
converted in frequency by Frequency Converter
zero.
AN/ARM-69. The two modulation signals can be
(4) Set the MD-83A/ARN TONE LOCALIZER to
varied in relative amplitude by the MODULATION
4 DB (left side) for 150 Hz predomination.
and ATTENUATOR controls on the AN/ARM-5. The
(5) The AN/ARM-92B DEVIATION meter shall
glideslope test signal is set upon the bench test equip-
indicate between 70 and 110 microampere left of
ment as follows:
zero.
(1) Set the AN/ARM-69 power switch to ON. The
f. LOC Alarm Flag Test.
power lamp shall light.
(1) Set up a standard LOC test signal (para 3-20a,
(2) Set the AN/ARN-5 controls as follows
b, and c).
(a) POWER STANDBY switch to POWER.
(2) The AN/ARM-92B FLAG meter shall indicate
(b) MC switch to B.
220 microamperes minimum.
(c) MODULATION switch to 90~.
(3) Set the MD-83A/ARN TONE LOCALIZER
(d) Adjust 90~ MOD for 22.5 on %M meter.
switch to CAL 150~.
(e) MODULATION switch to 150~.
(4) The AN/ARM-92B FLAG meter shall indicate
(f) Adjust 150~ MOD for 22.5 on %M meter.
180 microampere or less.
(g) MODULATION switch to AMP LOC
(5) Set the MD-83A/ARN TONE LOCALIZER
The %M meter should read approximately 40.
switch to CAL 90~.
(3) Set the AN/ARM-69 FREQ MC switch to
(6) The AN/ARM-92B FLAG meter shall indicate
332.0.
180 microampere or less.
(4) Adjust RF LEVEL SET until LEVEL SET
meter pointer is centered.
3-21. Glideslope Bench Tests
(5) Remove Cable CG-409/U (without attenuator)
a. Test Setup. The glideslope bench tests are per-
from the AN/ARM-5 RF OUTPUT 1 VOLT jack and
formed with the test setup shown in figure 3-2. Stand-
connect to the RF OUTPUT ATTEN jack.
ard 52-ohm coaxial cables with mating connectors are
(6) Set AN/ARM-92B OFF/PWR/TEST switch to
used for all rf and modulation interfaces. Adapter
PWR.
Cable CX-13034/AR connects the receiver to Radio
d. Rf Sensitivity Test,
Test Set AWARM-92B.
(1) Adjust the AN/ARM-5 ATTENUATOR to 50
b. Initial Switch Settings. Before performing the
microvolt.
glideslope section bench test procedures, the controls
(2) Set MODULATION switch to AMP LOC
of all items of test equipment should be set as follows:
(3) The AN/ARM-92B DEVIATION meter must
Radio Test Set AN/ARM-92B
indicator 90 30 microamperes right of zero.
3-12
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