COMMUNICATIONS, HF COM
Operation
Aircraft Operations Manual
4/2.2
O
PAGE
2
Apr 01/15
COLLINS HF 230
CONDITIONS
NORMAL PROCEDURES
(Cont’d)
2.
Select the desired user channel.
Rotate the left outer channel select knob in either direction until user channel 1
or 40 appears at the right side of the CHAN display. Then use the right outer
channel select knob to select the desired channel number (from 1 to 40) to
program.
3.
Initiate program mode.
Press the program (PGM) button once to initiate the programming sequence.
At this point, the entire display will begin to slowly blink.
4.
Enter the receive frequency and mode of operation.
Set the desired receive frequency using the four frequency select knobs. The
receive frequency will appear in the FREQ kHz display. Next, select the de-
sired operating mode (USB, LSB, AM, TEL SUP CAR or TEL PLT CAR) by
pulling out the PULL MODE knob and rotating it until the appropriate mode
appears in the MODE display.
5.
Store the receive frequency and mode of operation.
With the desired receive frequency and mode being displayed, press the
PGM button once again to store the data. The display will blank for a short
period of time to confirm storage.
6.
Enter and store the transmit frequency.
When the display returns, it will be blinking faster with the transmit frequency
displayed (initially this is the same as the already programmed receive fre-
quency). At this point, the operator have approximately 20 seconds to begin
entering the desired transmit frequency. If no changes are made during the
next 20 sec. the currently displayed transmit frequency will become invalid
and a receive
−
only channel have been created. Set the desired transmit fre-
quency using the four frequency select knobs.
With the desired transmit frequency shown in the FREQ kHz display, press
the PGM button once again to store the data. As before, the display will blank
for a short period of time to confirm the storage. The display will then return to
normal with the new channel data (channel number, mode and receive fre-
quency) showing.
B.
Simplex
The user programs the same frequency for receive and for transmit. The user
also assigns one of the available operating modes (USB, LSB, AM, TEL SUP
CAR and TEL PLT CAR) to the selected channel. Simplex operation is used
by ARINC, ATC (Air Traffic Control) and others.
1.
Ensure that the CHAN/FREQ selector is in the CHAN position.
(Cont’d)