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|  TM 11-5826-257-24
c. Glideslope Test Signal. The glideslope test
(3) Check to see that the AN/ARM-92B DE-
signal is an rf carrier, amplitude modulated 22.5
VIATION meter indicates 0 30 microamperes.
percent by a 90-Hz signal and 22.5 percent by a
f. Deflection Sensitivity Test.
150-Hz signal. The rf carrier supplied by Radio
(1) Adjust the AN/ARM-5 ATTENUATOR to
Test Set AN/ARM-5 is converted in frequency by
700 microvolts.
Frequency Converter AN/ARM-69. The two mod-
(2) Set the AN/ARM-5 MODULATION switch
ulation signals can be varied in relative amplitude
to AMP LOC
by the MODULATION and ATTENUATOR con-
(3) Check to see that the AN/ARM-92B DE-
trols on the AN/ARM-5. The glideslope test signal
VIATION meter indicates 90 30 microamperes
is set up on the bench test equipment as follows:
right of 0.
(1) Set the AN/ARM-69 power switch to ON.
(4) Set the AN/ARM-5 MODULATION switch
The power lamp shall light.
to AMP LOC
(2) Set the AN/ARM-5 controls as follows:
(5) Check to see that the A N / A R M - 9 2 B D E -
(a) POWER-STANDBY switch to POWER.
VIATION meter indicates 90 30 microamperes
(b) MC switch to B.
left of zero.
(c) MODULATION switch to 90~.
g. Agc Response Test.
(d) Adjust 90~ MOD for 22.5 on %M meter.
(1) Adjust the AN/ARM+ ATTENUATOR to
(e) MODULATION switch to 150~.
700 microvolts.
(f) Adjust 150~ MOD for 22.5 on %M me-
(2) Set the AN/ARM-5 MODULATION switch
ter.
(g) MODULATION switch to AMP LOC
to AMP LOC
The %M meter should indicate approximately 40.
(3) Check to see that the AN/ARM-92B DE-
VIATION meter indicates 90 30 microamperes
(3) Set the AN/ARM-69 FREQ MC to 332.0.
right of zero.
(4) Adjust RF LEVEL SET until LEVEL
SET meter pointer is centered.
(4) Adjust the AN/ARM-5 ATTENUATOR
slowly between 100 and 10,000 microvolts. The
(5) Remove the Cable CG-409/U (without at-
AN/ARM92B DEVIATION meter indicate within
tenuator) from the AN/ARM-5 RF OUTPUT 1
30 microamperes of the previously noted reading
VOLT jack and connect it to the RF OUTPUT
throughout the entire output level range.
ATTEN jack.
h. Warning Signal Test.
d. Rf Sensitivity Test.
(1) Adjust the AN/ARM-5 ATTENUATOR to
(1) Adjust the AN/ARM-5 ATTENUATOR to
700 microvolts.
50 microvolts.
(2) Set MODULATION switch to AMP LOC
Table 4-4. Frequency pairs for glideslope sensitivity test
(3) Check to see that the AN/ARM-92B DE-
AN/ARM-92B
VIATION meter indicates 90 30 microamperes
Freq sel
Sig gen
right of 0.
(mHz)
freq (mHz)
(4) Set AN/ARM-69 FREQ MC and AN/
334.70
108.10
ARM92B CONTROL frequency to each glide-
334.10
108.30
329.90
108.50
slope channel in table 4-4 and verify the AN/
330.50
108.70
ARM92B DEVIATION meter indicates 90 30
108.90
329.30
microamperes right of 0 at each setting.
331.40
109.10
(5) Repeat the test on all frequencies with
332.00
109.30
332.60
109.50
the AN/ARM5 MODULATION switch set to
109.70
333.20
AMP LOC . The AN/ARM-92B DEVIATION
333.80
109.90
meter must indicate 90 30 microamperes left of
334.40
110.10
0 at each setting. Return the controls to 332.0 and
335.00
110.30
109.30.
110.50
329.60
330.20
110.70
e. Course Centering Test.
110.90
330.80
111.10
331.70
(1) Adjust the AN/ARM-5 ATTENUATOR to
111.30
332.30
700 microvolts.
111.50
332.90
(2) Set the AN/ARM-5 MODULATION switch
111.70
333.50
111.90
331.10
to AMP LOC
4-6
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