COMMUNICATIONS, HF COM
Description
Aircraft Operations Manual
4/2.1
O
PAGE 3
Apr 01/15
COLLINS HF
−
230
3.
CONTROLS AND INDICATORS
Channel / Frequency select knobs.
Knob functions when selecting a descrete frequency:
Knob functions when selecting a user programmed channel:
Left outer
−
Selects the MHz digits (1 through 29 in the
Left outer
−
Rotate until it brings up user channel
FREQ kHz display.
number 1 or 40. If user channel 1 is being
displayed, the next clockwise increment of
Left inner
−
Selects the 100 kHz digit (0 through 9) in
the knob will cause user channel 10 to be
(pushed in)
the FREQ kHz display.
displayed, then 20, 30 and 40. User chan
−
nels are designated by 1
−
or 2
−
digit chan
−
Left inner
−
Rotate to select between USB, AM and
nels numbers appearing at the right side of
(pushed out)
LSB modes.
the CHAN display (the upper two or three
digits are blanked).
Right outer
−
Selects the 10 kHz digit (0 through 9)
in the FREQ kHz display.
Left inner
−
No effect on user channels.
(pushed in or
Right inner
−
Selects the 1 kHz digit (0 through 9)
pulled out)
(pushed in)
in the FREQ kHz display.
Right outer
−
With user channel 1 displayed, clockwise
Right inner
−
Selects the 100 kHz digit (0 through 9)
rotation of this knob will increment
(pulled out)
in the FREQ kHz display.
through the 40 user channels one channel
at a time. The next increment past user
channel 40 will cause the lowest ITU chan
−
nel number (401) to be called up. With
user channel 40 displayed, counterclock
−
wise rotation of the right outer knob will
decrement through the 40 user channels,
1 channel at a time. The next decrement
past user channel 1 will cause the highest.
ITU channel number (2240) to be called up.
USB
PGM
PULL
MODE
CHAN
MODE
FREQ KHZ
R
PULL
100
V
S
CHAN
OFF
CLAR+
TST
FREQ
HF
A26534
Channel/Mode/Frequency display
.
OFF/Volume control.
−
Turning the control clockwise out of the
detent applies power to the system.
−
Continued clockwise rotation increases the
audio volume. The volume control works in
conjunction with the HF volume lever on the
ACP (Audio Control Panel), both controls
have to be set, see operation AOM 4/2.2.
CLAR, clarifier control.
−
Permits the received signal to be varied
100 Hz to improve audio clarity when re
−
ceiving slightly “off frequency” USB, LSB or
telephone signals.
−
Does not affect AM reception, and it is dis
−
abled during transmit or when the control is
positioned to OFF.
Squelch control.
−
Rotate clockwise to mute undesired back
−
ground noise.
−
TST
−
squelch is deactivated (maximum
background noise).
Channel/Frequency selector.
−
Selects either channel mode or descrete
frequency mode of operation.
Photocell.
Controls display brightness.
R
−
Receive.
T
−
Transmit.
Right inner
−
No effcect on user channels.
(pushed in or
pulled out)
Knob functions when selecting an ITU telephone channel:
Left outer
−
This knob is used to select the ITU band
(the one or two left
−
hand digits in the CHAN
display). Clockwise rotation of the knob
increments the CHAN display to the next
higher ITU band and counterclockwise
rotation decrements to the next lower ITU
band. If ITU channel 401 is being displayed,
the next clockwise increment of the knob
will cause ITU channel 601 to be displayed,
then 801, 1201, 1601 and 2201. Rollover
occurs between the top ITU band (22 MHz)
and user programmed channel number 1
and between the lowest ITU band (4 MHz)
and user programmed channel number 40.
Left inner
−
No effect on ITU channels.
(pushed in)
Left inner
−
Rotate to select between TEL SUP CAR
(pulled out)
and TEL PLT CAR modes.
Right outer
−
This knob selects the indicidual channel
number within the ITU band (the two right
−
hand digits in the CHAN display). If the
channel number is incremented beyond the
highest channel for that band, the lowest
channel for the next higher band will
appear. For example, if ITU channel 426 is
being displayed, the next clockwise incre
−
ment of the knob will cause ITU channel
601 to be displayed. Likewise, decrementing
below the lowest channel in a band will
select the highest channel in the next
lower band.
Right inner
−
No effect on ITU channels.
(pushed in or
pulled out)
PGM, program button.
Provides storage of frequencies in the 40 user
programmable channels.
There are three types of channels that can be
programmed:
−
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 used by the maritime
radiotelephone network (public correspon
−
dence) stations.
−
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 or TEL PLT
CAR) to the selected channel. Simplex
operation is used by ARNIC, ATC (Air Traffic
Control) and others.
−
Recevie
−
only.
The user programs a frequency for receive
and asssigns one of the available operating
modes (USB, LSB, AM, 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 program
−
med for receive
−
only operation. Receive
−
only
channels are used to listen to frequency
standards (WWV for example) time, weather,
Omega status, and geophysical alert broad
−
casts to name just a few.
HF CONTROL UNIT
Fig. 2 HF COM
−
controls
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