TM 1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
(d) Fly aircraft to a point 40 nautical
miles away from test station.
(e) At 40 nautical miles, maintain
communication with test station
each 10° while flying a 360° flat
turn (not to exceed 5° bank).
Verify that communication is
uniformly loud and clear through
these tests.
(f) Repeat procedure for frequencies
in low, middle, and high ranges.
* 6. HF radio set - Check as follows.
K10
(a) Transmitter selector switch
(audio control panel) - HF.
(b) Microphone switch - Press
momentarily and wait for
antenna coupler to tune. A 1000
Hz tone will be heard in the
headphones until tuning is com-
plete. Verify that tuning time
does not exceed 30 seconds.
(c) Establish communications with a
ground station at least 150 miles
distant on at least three frequen-
cies (one each from the lower,
middle, and upper frequency
ranges). Establish two-way com-
munications on AM and, when
possible, on USB. Obtain signal
quality reports from the other sta-
tion and note received signal
quality.
4-12
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