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Page Title:
Section VII. ALTERNATE VOR/LOC BENCH TEST |
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|  TM 11-5826-258-24
(4) Adjust the AN/URM-127 frequency control to
Counter
Electronic
Digital
AN/USM-207
130 (1300 Hz).
Readout)
(5) The amber MIDDLE marker lamp on the
Peak on meter
AMP. TRIMMER
AN/ARM-92B must light. The blue and white lamps
SET LEVEL (red arrow)
OUTPUT LEVEL
must not light.
80%
MOD LEVEL
( 6 ) Set the AN/ARM-127 FREQ. RANGE
Audio Output Meter TS-585/U
X1, 150
IMPEDANCE
MULTIPLIER to X100.
10
MULTIPLY BY
(7) Adjust the AN/URM-127 frequency control to
c. Marker Test Signal. The marker test signal is a
30 (3000 Hz).
75-MHz rf carrier amplitude-modulated 80 percent by
(8) The white AIRWAY marker lamp on the
a single tone of 400 Hz, 1300 Hz, or 3000 Hz.
AN/ARM-92B must light. The blue and amber lamps
d. Audio Output Power Test.
must not light.
(1) Adjust the AN/USM-44 FREQUENCY control
f. Threshold Sensitivity Test.
for a peak reading on Audio Output Meter TS-585/U.
(1) Set the AN/ARM-92B SENS switch to HI.
(2) Adjust the AN/USM-44 ATTEN. dial until the
( 2 ) Set the AN/URM-127 FREQ. RANGE
blue lamp (outer) on the AN/ARM-92B glows dimly.
MULTIPLIER to X10.
(3) Note the reading in millivolts on the
(3) Set the AN/URM-127 frequency control to
AN/USM-44 ATTEN, dial; then adjust the ATTEN.
130 (1300HZ).
dial to 10 times the noted reading.
(4) Adjust the AN/USM-44 ATTEN. dial until
(4) The TS-585/U must indicate at least 40
amber lamp (middle) on AN/ARM-92B glows dimly.
milliwatts.
( 5 ) The rf output level indicated on the
e. Lamp Actuation Test.
AN/USM-44 ATTEN. dial must be between 250 and
(1) Adjust the AN/URM-127 frequency control to
1000 microvolts.
40 (400 Hz).
(6) Set the AN/ARM-92B SENS switch to LO.
(2) Adjust the AN/USM-44 ATTEN. dial to 50
(7) Adjust the AN/USM-44 ATTEN. dial until
millivolts
amber lamp on AN/ARM-92B glows dimly.
(3) The blue OUTER marker lamp on the
( 8 ) The rf output level indicated on the
AN/ARM-92B must light. The amber and white lamps
AN/USM-44 ATTEN. dial must be between 1.0 and
must not light.
3.0 millivolts.
Section VII. ALTERNATE VOR/LOC BENCH TEST
3 - 2 3 . General
Control
Setting
V/L
AUDIO
This section presents an alternate VOL/LOC bench
N(0)
OBS COURSE CARD
teat procedure using Radio Test Set AN/ARM-5A.
114.90
CONTROL frequency
a. Test Setup. All VOR and LOC bench teats are per-
Audio Output Meter TS-585/U:
formed according to the test setup in figure 3-4. Coax-
Setting
Control
X1, 150
ial cables with 52-ohm characteristic impedance are
100
MULTIPLY BY
used for all rf and modulation interfaces. Test set cable
Radio Test Set AN/ARM-5A:
plugs P2, P3, and P7 mate with jacks J2, J3, and J7 on
Setting
Control
Receiver Adapter Cable CX-13034/AR. Plugs P11001
ON
POWER
and P12002 on the receiver adapter cable connect to
0
OMNI TRACK
OMNI
MODULATION
J11001 and J12002 on the receiver panel.
OFF
IDENTIFIER
b. Initial Switch Settings. Before performing the
B(114.90)
MC
VOL/LOC receiver section bench test procedures, set
lK
ATTENUATOR V
the controls of all items of test equipment as follows:
30~ MOD
Full ccw
Radio Test Set AN/ARM-92B:
9960~ MOD
Full ccw
Setting
Control
90~ MOD
Full ccw
PWR
OFF/PWR/TEST
Full ccw
150~ MOD
400Hz
MODE
Adjust ZERO SET for 0.
RF meter
BRG
BEARING switch
Adjust ZERO SET for 0.
%M (MODULATION) meter
0
BEARING control
Adjust for red level set line
RF LEVEL SET
N(0 degrees)
COMPASS SIMULATOR
Set to 1000~.
MODULATION
4
FLAG LOAD
Adjust for 30% (0-100 scale)
1000~ MOD
LO
SENS
on %M meter.
V/L RCVR
IND TEST
c. Test Procedure. After the test equipment has
0
DEVIATION
3-14
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