TM 11-6625-486-14&P
Control Settings
Test Procedure
Performance Standard
Test Equipment
Equipment under test
POWER: ON.
FUNCTION SW: CHK.
a. Apply power to AN/USM-
a. None
FUNCTION: FREQUENCY.
RANGE SW: B.
26(*) and allow it to warm
STD FREQ: 10 MC.
up for 15 minutes.
STD GATE TIME: 1.
b. Tune AN/USM-159(*) to
b. None.
MIXING FREQ MCS: 0.
5,000-kHz (5 MHz) check-
point and adjust TUNING
knob and CORRECTOR
control to obtain a readout
frequency of 3,000 Hz on
AN/USM-26(*).
c. Lock TUNING knob and
c. Frequency shift should be
dial with DIAL LOCK
within 0.0025% (limits
lever. Observe readout
125 Hz, computed at
frequency on AN/USM-
5,000 kHz).
26(*).
c. Procedure. Follow the procedures outlined in
6-38. Modulator Repetition Rate
Meter AN/USM-26(*) (with plug-in converter).
b. Test Connections and Conditions. Connect the
equipment as shown in figure 6-20.
Control Settings
Test Procedure
Performance Standard
Test Equipment
Equipment under test
POWER: ON.
FUNCTION SW: MOD.
a. Apply power to AN/USM-
a. None.
FUNCTION: FREQUENCY.
RANGE SW: Any range.
26(*) and allow it to warm
STD FREQ: 100 kHz.
AUDIO GAIN: Fully -clock-
up for 15 minutes.
STD GATE TIME: 1.
wise.
b. Observe frequency indicated
b. Readout frequency should be
MIXING FREQ. MCS: 0.
on AN/USM-26(*).
900 Hz 300 Hz.
(1) Connect the equipment as shown in figure 6-
6-39. Spurious Crystal Checkpoint Rejection
a. Test Equipment and Materials.
(2) Allow the oscilloscope to warm up for 15
(1) Oscilloscope AN/USM-151(*).
minutes and the frequency meter (battery operations) for
(2) Headset H-216/U.
5 minutes.
(3) 600-ohm dummy load (fabricated in
c. Procedure. Follow the procedures outlined in
accordance with instructions given in paragraph 6-10).
b. Test Connections and Conditions.
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