TM 55-1510-222-MTF
P R O C E D U R E
T R O U B L E S H O O T I N G
R E F E R E N C E
c. Off-volume control - Turn
clockwise, set volume as re-
quired.
d. Frequency selector - Set de-
sired frequency.
e. Fly aircraft to a point 40 nau-
tical miles away from test sta-
tion.
f. At 40 nautical miles. main-
tain communication with test
station each 10° while flying a
360° flat turn (not to exceed
5°
bank).
Communication
should be uniformly loud and
clear through these tests.
g. Repeat procedure for frequen-
cies in low, middle. and high
ranges.
*7.
HF radio set - Check as follows.
K10
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 an-
tenna coupler to tune. A 1000
Hz tone will be heard in the
headphones until tuning is
complete. Tuning time should
not exceed 30 seconds.
d. Establish
communications
with a ground station at least
150 miles distant on at least
three frequencies (one each
4-25
