COMMUNICATIONS, HF COM
Operation
Aircraft Operations Manual
4/2.2
O
PAGE
3
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 simplex receive (and transmit) frequency using the four fre-
quency select knobs. The selected frequency will appear in the FREQ kHz
display. Next, select the desired 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 simplex 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.
Store the transmit frequency.
When the display returns, it will be blinking faster with the simplex transmit
frequency displayed (this is the same as the already programmed receive fre-
quency). At this point, the operator have approximately 20 seconds to com-
plete the simplex programming operation. If no changes are made during the
next 20 seconds, the currently displayed transmit frequency will become in-
valid and a receive
−
only channel have been created. Press the PGM button
once again to store the frequency. As before, the display will blank for a short
period of time to confirm storage. The display will then return to normal with
the new channel data (channel number, mode and simplex frequency) show-
ing.
C.
Receive
−
only
The user programs a frequency for receive and assigns one of the available
operating modes (USB, LSB, TEL SUP CAR or TEL PLT CAR) but does not
program a transmit frequency. The transmitter and power amplifier are locked
out and can not be used when a channel has been programmed for receive
−
only operation. Receive
−
only channels are used to listen to frequency stan-
dards (WWV for example), time, weather, Omega status and geophysical
alert broadcasts to name just a few.
(Cont’d)
