AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
MARCH 30, 2001
2-18-21
Page
7
Code
01
SIMPLEX CHANNEL PROGRAMMING PROCEDURE
When you program a channel for simplex operation, both the receive
and the transmit frequencies will be the same. Programming a simplex
channel is similar to programming a half-duplex channel, except the
PGM button is pressed twice after the receive frequency and mode of
operation are entered to store the frequency in both the receive and
the transmit positions.
RECEIVE-ONLY CHANNEL PROGRAMMING PROCEDURE
When you program a channel for receive-only operation, only a receive
frequency is entered and stored. Programming a receive-only channel
is similar to programming a simplex channel except the PGM button is
pressed only once after the receive frequency and mode of operation
are entered. The programming sequence is then terminated without
entering a transmit frequency.
Program sequence can be terminated in any one of the three ways:
− By momentarily keying the PTT.
− By positioning the CHAN/FREQ switch to FREQ and then back to
CHAN.
− By waiting for the 20-second timer to run out (this is the preferred
method).
THE 176 ITU CORRESPONDENCE CHANNELS OPERATION
The 176 ITU (International Telecommunication Union) public
correspondence channels (and their receive and transmit frequencies)
in the maritime radiotelephone network are permanently programmed
in the nonvolatile memory of the CTL-230 Control. The 176 ITU
channels all operate half-duplex in TEL SUP CAR (preferred) or TEL
PLT CAR modes only.
Perform the following steps to operate on the ITU channels:
1 - Access channelized operation.
Apply power to the system by rotating the volume (V) knob
clockwise from the OFF position.
With power applied to the system, ensure that the CHAN/FREQ
switch is in the CHAN position.
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