03-TM-0038 REV 00 PAGE 3 of 5
SECTION II
OPERATION
2.1. OPERATION
A. Turn the GAIN control to a fully clockwise position. A
pronounced background noise should be present. Lack of
noise may indicate a dead battery. Should this occur, replace
battery before resuming operational testing. See Mainte-
nance Section 3.2.
B. Set the TUNING control to approximately midscale.
Rubbing fingers in front of microphone should produce a
rushing noise from speaker.
C. Actuate a beacon under test by immersing the water
switch in tap water, or by shorting the water switch terminal
to the case by means of a shorting tab. The beacon need not
be removed from its mount on the aircraft to perform opera-
tional testing.
D. Set the GAIN control at a comfortable listening level.
E. Point the microphone of the Test Set towards the water
switch end of the Beacon for best results. If the Beacon is
mounted, position the Test Set for maximum unobstructed
signal. Beacon operation will be indicated by an audible
pulsing tone.
F. The tuning control permits reception of an acoustic signal
operating anywhere within the 30 to 45 kHz frequency
range. The audio response is peaked at about 3200 Hz;
therefore, the test set should be tuned to produce an output
signal of approximately this frequency to achieve greatest
sensitivity.
CAUTION
TO CONSERVE BATTERY LIFE, GAIN
CONTROL SHOULD BE SET TO OFF
POSITION WHEN TEST SET IS NOT IN
ACTUAL USE.
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