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|  TM 11-5826-258-24
AN/ARM-5A to OMNI.
the AN/ARM-5A MC switch to A (110.9)
( 2 ) Set the BEARING selector on the
MHz).
AN/ARM-92B to 0.
d. LOC Centering Test.
(3) Set the OMNI TRACK switch o n t h e
(1) Set the Modulation switch on the
AN/ARM-5A to 0.
AN/ARM-5A to AMP LOC
(4) The DEVIATION meter on the AN/ARM-92B
(2) Set the ATTENUATOR v control to 1K.
shall indicate zero 120 microampere (equivalent to
(3) The AN/ARM-92B DEVIATION meter shall
5).
indicate 0 10 microampere.
(5) The RMI pointer on the AN/ARM-92B must
e. LOC Deflection Sensitivity Test.
indicate within 70 of the BEARING selector setting.
(1) Set the MODULATION switch on the
(6) Repeat (2) through (5) above substituting the
AN/ARM-5A to AMP LOC
following angles in (2) and (3) above:
(2) The AN/ARM-92B DEVIATION meter shall
indicate between 60 and 120 microampere left to
30, 60, 90, 120, 150, 180, 210, 240, 270
300, and 330
zero.
( 7 ) Set the OMNI TRACK switch on the
(3) Set the MODULATION switch on the
AN/ARM-5A to AMP LOC
AN/ARM-5A to 30.
(8) Set the COMPASS SIMULATOR on the
(4) The AN/ARM-92B DEVIATION meter shall
indicate between 60 and 120 microampere right to
AN/ARM-92B to the following settings
0, 60, 90, 150, 180, 210, 270, and 330.
zero.
f. LOC Alarm Flag Test.
(9) The RMI pointer on the AN/ARM-92B must
indicate 30 7 for all the above settings.
(1) Set the MODULATION switch on the
h. VOR Self-Test.
AN/ARM-5A to AMP LOC
(1) Set the OMNI TRACK switch of the
(2) The AN/ARM-92B FLAG meter shall indicate
220 microampere minimum.
AN/ARM-5A to 0.
(3) Set the MODULATION switch on the
(2) Set the BEARING switch on the
AN/ARM-5A to 150~.
AN/ARM-92B to OBS.
(4) The AN/ARM-92B FLAG meter shall indicate
(3) Set the OBS control on the AN/ARM-92B to
180 microamperes or less.
315.
(4) Actuate the TEST switch on the
(5) Set the MODULATION switch on the
AN/ARM-92B CONTROL panel.
AN/ARM-5A to 90~.
(6) The AN/ARM-92B FLAG meter shall indicate
(5) The DEVIATION meter on the AN/ARM-92B
180 microampere or leas.
must indicate zero 120 microampere. (Allow time
for the meter to settle.)
3-26. VOR/LOC Receiver Sensitivity Test
(6) The TO-FROM meter on the AN/ARM-92B
This procedure provides an alternate test of the
must indicate greater than 500 microampere to the
left of zero.
VOR/LOC receiver sensitivity for frequencies other
(7) The FLAG meter on the AN/ARM-92B must
than 114,90 MHz. The teat is performed with the test
indicate 220 microampere minimum.
setup in figure 3-5,
(8) The RMI pointer on the AN/ARM-92B must
a. Initial Switch Settings.
Radio Test Set AN/ARM-92B:
point between 308 and 322 degrees.
Control
Setting
(9) Release the TEST switch.
OFF/PWR/TEST
PWR
MODE
400 Hz
3-25. LOC Bench Tests
BEARING switch
BRG
a. Test Setup. The LOC bench test are performed
BEARING control
0
COMPASS SIMULATOR
N (0 degrees)
with the same test setup as used for VOR bench tests
FLAG LOAD
4
SENS
L0
b. Initial Switch Settings. The initial switch set-
IND TEST
V/L RCVR
tings for the localizer bench tests are the same as for
DEVIATION
0
the VOR bench tests except that the AN/ARM-92B
AUDIO
V/L
OBS
N (0)
CONTROL FREQUENCY must be set to 110.90 MHz.
Audio Output Meter TS-585/U:
Control
Setting
graph 3-23b and c.
Xl, 150
100
MULTIPLY BY
NOTE
Signal Generator AN/USM-44:
Before performing the LOC bench tests, be
Control
Setting
sure the 90~ and 150~ modulation percent-
Power Switch
ON
ages are set to exactly 20 percent each. Set
Output Attenuator (control)
1.0 millivolt (-47 dBm)
3-19
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