NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-21
Page
4
Code
01
MARCH 30, 2001
- Always key the PTT after selecting a new frequency to initiate
the antenna coupler tuning cycle. If this is not done, you may
experience poor reception or miss important calls.
- During operation, if the receive (R) or transmit (T)
annunciators on the CTL-230 flash, this indicates that the
receive or transmit (as applicable) frequency data does not
match that being sent by the CTL-230. An equipment
malfunction is probable and the system should be checked
by maintenance personnel.
PROGRAMMABLE CHANNEL OPERATION
In the channel mode operation, the user may select ITU and user
programmed channels by their channel numbers. For user
programmed channels:
1 - Access channelized operation.
Apply power to system (rotate the V knob from the OFF position),
and position the CHAN/FREQ switch to the CHAN position.
2 - Rotate the left outer channel select knob until user channel 1 or 40
appears on the right side of the CHAN display. Use the right outer
channel select knob to select the desired channel number within the
user programmed channels.
3 - Tune the antenna.
Momentarily key the PTT to initiate antenna coupler tuning cycle.
Adjust volume and squelch controls, as desired.
THE 40 USER CHANNELS PROGRAMMING PROCEDURE
The 40 user programmable channels available in the HF-230 system
can be programmed on the ground or in flight. All programmed
information is stored in a nonvolatile memory and can be recalled by
selecting the desired user channel number.
There are three types of channels that can be programmed:
1 - Half-duplex
The user programs two different frequencies, one for receive and
one for transmit. The user also assigns one of the available
operating modes (USB, LSB, AM, TEL SUP CAR, or TEL PLT
CAR) to the selected channel. Half-duplex operation is available
only when the HF-230 is being operated in the CHAN mode.
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