TM 1-1510-225-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
NOTE
The intelligibility of SSB voice operations
becomes degraded when the receiver and trans-
mitter differ in frequency by a small amount
(approximately 50 Hz). The voice pitch will sound
either too high or too low. The cause may be
either the receiver or transmitter.
(d) Frequency accuracy - Check as
follows:
(1) Station WWV - Select the fre-
quency that provides the best
signal. The station broadcasts
on 2.5000, 5.0000, 10.0000,
15.0000, and 20.0000 MHz.
The higher the frequency
selected, the more accurate
the frequency check will be.
N O T E
Do not key transmitter when set to WWV.
(2) Mode selector - USB.
(3) Listen to the time tick, tone,
or voice announcements. The
tone is preferable.
7. Cockpit voice recorder - Check as fol-
lows:
(a) ERASE pushbutton - Depress for
4 seconds minimum.
(b) Headset - Listen for erasure tone.
Erase function shah not work in
flight.
8. ADF radio set - Check as follows:
K14-16
(a) Power and mode switch - ADF.
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