AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
JUNE 29, 2001
2-18-21
Page
5
Code
02
2 - Simplex
The user programs the same frequency for receive and for transmit.
The user also assigns one of the available operating modes (USB,
LSB or AM) to the selected channel. Simplex operation is used by
ARINC, ATC (Air Traffic Control), and others.
3 - Receive-only
The user programs a frequency for reception and assigns one of
the available operating modes (USB, LSB or AM), but leaves the
transmit portion of the preset channel blank.
The transmitter and power amplifier are locked out and cannot be
used when a channel has been programmed for receive-only
operation.
Receive-only channels are used to listen to frequency standards
(W W V) for example, time, weather, Omega status, and
geophysical alert broadcasts.
SEMI-DUPLEX CHANNEL PROGRAMMING PROCEDURE
1 - Access channelized and program mode.
Apply power to the system by rotating the VOLUME (V) knob
clockwise from the OFF position. Make sure that the FREQ/CHAN
button is pressed, in the CHAN position. Activate the program mode
by pressing the PGM switch with a pointed object.
2 - Select the desired user channel.
Rotate the inner concentric knob to select the channel number to be
programmed.
3 - Select emission mode.
Use the MODE button to select emission mode (USB, LSB or AM).
Press the MODE button until the desired mode appears.
4 - Enter the receive frequency.
Use the outer larger concentric knob to position the flashing
“cursor” on each digit of the receive frequency and use the smaller
inner knob to select the desired number in each position.
5 - Store the receive frequency and mode of operation.
Push the STO button once and the receive frequency is entered in
the electronic memory. The TX annunciator will begin to flash in the
display window indicating the receive frequency is stored and you
are ready to program the transmit frequency.
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