TM 1-1510-224-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
(c)
Off-volume control - Turn clock-wise, set
volume as required.
(d)
Frequency selector - Set desired frequency.
(e)
Fly aircraft to a point 40 nautical miles away
from test station.
(f)
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.
(g)
Repeat procedure for frequencies in low,
middle, and high ranges.
*7.
HF radio set - Check as follows.
(a)
Transmitter selector switch (audio control
panel) - #4.
(b)
Mode selector (HF control panel) - Set
desired operating mode.
(c)
Microphone switch - Press momentarily and
wait for antenna coupler to tune./ A 1000
Hz tone will be hear in the headphones until
tuning is complete. Verify that tuning time
does not exceed 30 seconds.
(d)
Establish communications with a ground
station at least 150 miles distant on at least
three frequencies (one each from the lower,
middle,
and
upper
frequency
ranges).
Establish two-way communications on AM
and, when possible, on USB. Obtain signal
K10
4-15
