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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
d. Mode selector switch (HF
control panel) - Set emission
mode (USB, LSB, or AM).
e. Tuning knobs - Set desired
frequency, then stow cursor.
f. Antenna coupler - Tune (de-
press microphone switch).
g. Establish
with a ground station at least
150 miles distant on at least
three frequencies (one each
from the lower, middle, and
upper frequency ranges). Es-
tablish two-way communica-
tions on AM and, when possi-
ble, on USB AND LSB.
Obtain signal quality reports
from the other station and
note received signal quality.
h. Clarifier control - PULL ON
and adjust as required if oper-
ating in the SSB emission
mode.
4-22
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