Hf Communications - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

HF COMMUNICATIONS

The HF communication system provides the
primary voice communication system during
overseas flights when out of VHF radio re-
ception and transmission range. Separate ra-
dios for the pilot (HF 1) and copilot (HF 2)
provide backup capabilities. The high fre-
quency range of 2.0000 to 29.0000 MHz pro-
vides long range voice transmission and
reception for ATC position reporting. The
flight crew uses the HF system with the SEL-
CAL system to alleviate continuously moni-
toring static-filled frequencies.
Both HF systems share an antenna (Figure
16-1), and each system uses a power amplifier-
coupler, a receiver-transmitter, and a control
unit (Figure 16-4). Located on the vertical
stabilizer leading edge, the antenna connects
MODE DISPLAY
DISPLAYS THE TYPE OF RF MODE
SELECTED BY THE VALUE CONTROL.
OPR DISPLAY
DISPLAYS THE OPERATING
MODES OR CONIDITIONS.
CURSOR
WHEN POSITIONED
UNDER A FIELD,
ALLOWS THAT
FIELD'S VALUES
TO BE CHANGED.
THE CURSOR IS
POSITIONED USING
H
THE CURSOR
F
CONTROL.
VOL CONTROL
ADJUSTS THE
RECIEVER AUDIO
LEVEL.
SQL CONTROL
ELIMINATES BACKGROUND
NOISE WHEN TEH SIGNAL
IS NOT RECIEVED.
FREQ/CHAN DISPLAY
THE FIRST FIVE DIGITS, FROM THE
LEFT, DISPLAY THE SELECTED
FREQUENCY. THE LAST DIGIT
INDICATES THE SELECTED CHANNEL.
IF A FAULTY MODULE IS DETECTED
DURING A SELF-TEST, THE FAULTY
UNIT NUMBER IS DISPLAYED.
OPR MODE
VOL DSBL
SQL
SQL DSBL PUSHBUTTON
DISABLES THE SQUELCH
FUNCTION.
CENTER PEDESTAL
Figure 16-4. HF Control Unit
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
separately to the antenna-coupler units. Each
receiver-transmitter receives inputs from the
antenna-coupler and provides outputs to the
audio integrating system.
The flight crew either selects a programmed
frequency or sets a desired frequency with the
HF control unit. The receiver-transmitter tunes
a synthesizer card that in turn tunes a radio fre-
quency (RF) tuner and capacitor network. A
momentary depression of the pilot or copilot
push-to-talk switch on the control wheel ini-
tiates the antenna-coupler unit tuning. Once
the unit is tuned, the flight crew may transmit.
The control unit may operate in eight differ-
ent modes. Some modes provide preset fre-
quencies for emergency use. A test mode
provides a self-test of the HF system.
FREQ/CHAN
FREQ/LD CURSOR
CHAN VALUE
CHAN SELECTOR
SELECTS ONE OF TEN PRESET
FREQUENCIES FOR DISPLAY ON THE
FREQ/CHAN DISPLAY. THE PRESET
FREQUENCY CHANNEL NUMBER IS
INDICATED BY THE LAST DIGIT OF
THE FREQ/CHAN DISPLAY.
PWR DISPLAY
INDICATES THE OUTPUT POWER
LEVEL SELECTED BY THE VALUE
CONTROL.
LOW POWER—BOTTOM BAR
MEDIUM POWER—BOTTOM TWO BARS
HIGH POWER—THREE BARS
PWR
VALUE CONTROL
ALTERS THE
FIELD MARK
BY THE CURSOR.
CURSOR
CONTROL
USED TO
POSITION THE
CURSOR TO
THE LEFT OR
RIGHT.
FREQ/LD PUSHBUTTON
THE FREQ/LD PUSHBUTTON
PREFORMS THE FUNCTION FOR
THE FOLLOWING OPERATING
MODES:
PGM MODE (SIMPLEX)
PGM MODE (DUPLEX)
MAR AND CHAN MODE (DUPLEX)
CL 601-3A/R 16-5
L t é e
L t d .