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|  TM 11-5826-258-24
(5) Actuate the TEST switch on the radio test set
modulator to 180.
CONTROL.
(9) The TO-FROM meter on the radio test set
(6) The DEVIATION meter on the radio test set
must indicate between 500 and 1200 microampere to
must indicate 0 40 microampere. (Allow time for
the right to zero.
the meter to settle.)
i. VOR Alarm Flag Test.
(7) The TO-FROM meter on the radio test set
(1) Set up a standard VOR test signal.
must indicate at least 500 microampere to the left of
(2) Set the PHASE ANGLE SELECTOR on the
zero.
modulator to 0.
(8) The FLAG meter on the radio test set must in-
(3) Set the BEARING selector on the radio test set
dicate 220 microampere minimum.
to 0.
(9) The RMI pointer on the radio test set must
(4) The FLAG meter on the radio teat set must in-
point between 310 and 320 degrees.
dicate 220 microampere minimum.
(10) Release the TEST switch.
(5) Set the FUNCTION SELECTOR switch on the
modulator to CAL.
3-20. LOC Bench Tests
(6) Set the SPECIFIC SIGNAL SELECTOR
a. Test Setup. The LOC bench tests are performed
switch on the modulator to 30~VAR .
with the same test setup as used for VOR bench tests
(7) The FLAG meter on the radio teat set must in-
(fig. 4-l).
dicate 180 microampere or less.
b. Initial Switch Settings. The initial switch set-
(8) Set the SPECIFIC SIGNAL SELECTOR
tings for the localizer bench tests are the same as for
switch on the modulator to 9960FM.
the VOR bench tests except that the radio teat set
(9) The FLAG meter on the radio teat set must in-
CONTROL frequency must be set to 110.10 MHz.
dicate 180 microampere or less.
c. Standurd LOC Test Signal. The standard LOC
j. VOR Runout Error Test.
test signal is an rf carrier amplitude modulated simul-
(1) Set up a standard VOR test signal.
taneously with 90 0.27 Hz and 150 0.45 Hz so that
(2) Set the BEARING switch on the radio test set
the sum of the two modulation percentages equals 40
to BRG.
2 per cent. When the test procedure calls for a stand-
(3) Set the FUNCTION SELECTOR switch on the
ard LOC teat signal, proceed as follows:
modulator to ODR.
(1) Set Power Supply PP-348/ARN POWER
(4) Set the BEARING selector on the radio test set
O
switch to ON.
to 0 .
(2) Set Signal Generator SG-lA/ARN controls as
(5) Set the PHASE ANGLE SELECTOR on the
follows
modulator for 0 on the radio test set DEVIATION
(a) FREQUENCY to 110.10.
meter.
(b) OUTPUT LEVEL to lK (1000 microvolts).
(6) The position of the PHASE ANGLE SELEC-
(c) MOD RANGE to 30%.
TOR on the modulator must be within * 3 of the
(d) MOD to EXT.
BEARING control setting.
(e) XTAL FREQ to 110.0 MC.
(7) The RMI pointer on the radio test set must in-
(3) Set Modulator MD-83A/ARN controls as fol-
dicate within 5 of the BEARING control setting.
(8) Repeat (4) through (7) above substituting the
lows:
(a) POWER to ON.
following angles in (4): 30, 60, 90, 120, 150,
(b) TONE LOCALIZER to CAL 90~.
180, 210, 240, 270, 300, 330.
(9) Set the PHASE ANGLE SELECTOR on the
(c) 1000~ to OFF.
MD-83A to 300.
(d) FUNCTION SELECTOR to TONE LOC.
(4) Set Radio Test Set AN/ARM-92B controls as
(10) Set the COMPASS SIMULATOR on the
follows:
AN/ARM-92B to the following headings 0, 60,
(a) OFF/PWR/TEST to PWR.
90, 150, 180, 210, 270, and 330.
(b) Frequency dial to 110.10.
The RMI pointer on the AN/ARM-92B must indicate
(c) IND TEST to V/L RCVR.
30 5 for all the above headings.
k. VOR Self-Test.
(5) Set Audio Output Meter TS-585/U IMPED-
ANCE to X1, 150 and MULTIPLY by 10.
(1) Set up a standard VOR test signal.
(6) Adjust SG-lA/ARN FREQUENCY dial for
(2) Set the PHASE ANGLE SELECTOR on the
peak on RF MONITOR meter.
modulator to 0.
(7) Adjust SG-1A/ARN RF LEVEL control for
(3) Set the BEARING switch on the radio test set
redline indication on RF MONITOR meter.
to OBS.
(4) Set the OBS control on the radio test set to
(8) Adjust SG-lA/ARN MOD LEVEL control for
315.
20 percent indication on PERCENT MODULATION
3-11
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