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|  TM 11-5826-258-24
been setup and the controls set as in b above, make the
d. VOR Course Width Test.
following control settings on the AN/ARM-5A:
(1) Set the MODULATION control on the
Setting
Control
AN/ARM-5A to OMNI.
Set to 9960~.
MODULATION
(2) Set the AN/ARM-92B BEARING switch to
9960~ MOD
A d j u s t for 30% (green
OBS.
arrow) on %M meter.
(3) Set the AN/ARM-92B OBS course card to N
MODULATION
Set to 30~.
(North).
30~ MOD
A d j u s t for 30% (green
(4) Set the OMNI TRACK control on the
arrow) on %M meter.
AN/ARM-5A to 0.
MODULATION
Set to 90~.
(5) Set ATTENUATOR V to 1K.
Adjust for 20% (red dot) on
90~ MOD
(6) Adjust the OBS knob on the AN/ARM-92B to
%M meter.
zero (a) indication on the DEVIATION meter.
set for 150~.
MODULATION
(7) Note the OBS course card reading.
Adjust for 20% (red dot) on
150~ MOD
(8) Adjust the OBS knob on the AN/ARM-92B for
%M meter.
a 150 (a) right indication on the DEVIATION meter.
NOTE
The OBS course card reading must be -10 3 from
Repeat adjustment of 90~ MOD and 150~
the reading in (7) above.
MOD until the same reading is obtained.
(9) Repeat (7) above for 150 (a) left indication.
The OBS course card shall be +10 3 from the
3-24 VOR Bench Tests
reading (7) above.
e. VOR TO/FROM Ambiguity Test.
a. Rf Sensitivity Test.
(1) Set the OBS control on the AN/ARM-92B to
(1) Set the AN/ARM-5A for a 5-microvolt output
N.
signal at 114.90 MHz modulated 30% by 1000 Hz as
(2) The TO-FROM meter on the AN/ARM-92B
follows:
(a) Set ATTENUATOR v control to 5.
must indicate greater than 500 microampere to the
(b) Set MODULATION control to 1000~.
left of zero.
(2) Note the TS-585/U meter reading in decibels,
(3) Set the AN/ARM-5A ATTENUATOR v to 5.
(4) The TO-FROM meter on the AN/ARM-92B
(3) Turn the AN/ARM-5A MODULATION switch
must indicate greater than 500 microamperes to the
to EXT. The TS-585/U shall indicate at least 6 db
left of zero.
lower than the noted reading.
( 5 ) REset the ATTENUATOR v of the
NOTE
If unusual or defective receiver performance
AN/ARM-5A to 1K.
has been noted on a specific channel frequen-
( 6 ) Set the OMNI TRACK switch on the
cy, perform the rf sensitivity test on that fre-
AN/ARM-5A to 180.
(7) The TO-FROM meter on the AN/ARM-92B
quency. Use the alternate rf sensitivity test
given in paragraph 3-26.
must indicate greater than 500 microampere to the
b. Audio Output Test.
right of zero.
f. VOR Alarm Flag Test.
(1) Set the AN/ARM-5A for a lK V output sig-
(1) Set the OMNI TRACK switch on the
nal at 114.90 MHz modulated 10 percent by 1000 Hz.
(2) Set MODULATION control to 1000~.
AN/ARM-5A to 0.
( 2 ) Set the B E A R I N G s e l e c t o r o n t h e
(3) Adjust 1000~ MOD control for 10 percent
modulation (0-100 scale).
AN/ARM-92B to 0.
(4) Set ATTENUATOR ~V to 1k.
(3) Set the BEARING switch on the
(5) The TS-585/U shall indicate at least 50 milli-
AN/ARM-92B to BRG.
watt.
(4) The FLAG meter on the AN/ARM-92B must
indicate 220 microampere minimum.
c. Agc Flatness Test.
(1) Set AN/ARM-5A for a 1K-microvolt output
(5) Set the MODULATION switch on the
signal at 114.90 Mz modulated 30 percent MHz by
AN/ARM-5A to 30~.
(6) The FLAG meter on the AN/ARM-92B must
1000 Hz.
indicate 180 microampere or leas.
(2) Set the AN/ARM-5A 1000~ MOD control for
(7) Set the MODULATION switch on the
30 percent (0-100 scale).
AN/ARM-5A to 9960~.
(3) Note TS-585/U meter indication in db.
(8) The FLAG meter on the AN/ARM-92B must
(4) Slowly vary the output of the AN/ARM-5A
indicate 180 microampere or less.
ATTENUATOR V between 10 microvolt and 10K
g. VOR Runout Error Test.
microvolt. The TS-585/U shall not vary more than
10 db from the noted indication.
(1) Set the MODULATION switch on the
3-18
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