COMMUNICATIONS, HF COM
Operation
Aircraft Operations Manual
4/2.2
O
PAGE
6
Apr 01/15
COLLINS HF 230
CONDITIONS
NORMAL PROCEDURES
(Cont’d)
5.
PULL MODE knob
SELECT AS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REQUIRED
−
Pulling out and rotating the PULL MODE knob when one of the 176 ITU
channels is selected cycles the system between TEL SUP CAR and TEL
PLT CAR mode.
−
All five of the modes (USB, AM, LSB, TEL SUP CAR and TEL PLT CAR)
are available for use on the user programmable channels. However, if one
of the 40 user programmable channels is selected and the PULL MODE
knob is pulled out and rotated, no mode changes will occur. This is because
the modes for these channels are selected and stored in non
−
volatile
memory during the programming sequence.
6.
PTT (Press To Transmit) button
PRESS
. . . . . . . . . . . . . . . . . . .
MOMENTARILY
−
Depress switch momentarily to initiate antenna tuning. This is indicated by
a a 1000 Hz tone and takes from 5 to 15 seconds.
−
When the tone stops, the HF system is ready for use.
−
If the antenna does not tune after approx. 35 to 40 seconds, the steady
1000 Hz tone will begin to beep, indicating a fault has occurred. To clear the
fault, simply rotate one of the frequency/channel select knobs away from
and then back to the desired frequency or channel and initiate another tun-
ing cycle by momentarily pressing the microphone ptt button. The 1000 Hz
tone should again be present and then disappear at the end of the tuning
cycle. If the beeping recurs, try the clearing procedure a second time; if a
fault is still indicated, there is probably an equipment malfunction.
2.4
COMMUNICA-
TION
Do not tune or transmit on HF system during fueling since fire and/or injury to
personnel may result.
WARNING
RECEIVE
1. HF volume lever (ACP)
ADJUST
. . . . . . . . . . . . . . . . . . . . . .
−
Use headset or handmicrophone and loudspeaker.
2. CLAR, clarifier control
SET
. . . . . . . . . . . . . . . . . . . . . . .
−
Start with the control at OFF and turn clockwise to improve audio clarity
when receiving slightly “off frequency” USB, LSB or telephone signals.
−
Does not affect AM reception, and it is disabled during transmit or when
the control is positioned to OFF.
(Cont’d)