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 TM 55-1510-218-MTF
TROUBLESHOOTING
PROCEDURE
REFERENCE
c. Function selector switch
(UHF command set) - BOTH.
d. Frequency selector switches -
Select required test frequen-
cies
e. Mode selector - As required.
f. Volume control - As required.
g. Squelch switch - As required.
h. Fly aircraft to a point 35 nau-
tical miles away from test sta-
tion.
i. Communicate with test sta-
tion when 20 miles away and
again at 35 miles
j. At 35 nautical miles maintain
communication with test sta-
tion each 10 while flying a
360 flat turn (not to exceed
5 bank). Communication
should he uniformly loud and
clear through these tests.
k. Repeat procedure for frequen-
cies in low, middle, and high
ranges.
K8-9
*6. VHF radio set (VHF-20B).
Check as follows:
a. Altitude - 1000 feet AGL.
b. Transmitter selector switch
(audio control panel) - VHF.
c. Off-volume control - Turn
clockwise, set volume as re-
quired.
4-17
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