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HF Preset and Direct Tuning Modes
When the coupler is tuning to match the antenna, a steady tone will be heard from the
transceiver. If tuning takes longer than six seconds, the tone will begin to beep,
signaling that the coupler was not able to tune properly. If this occurs, an ERR
annunciator is displayed and the frequency data will dash (----) on the RMU HF
window. To clear this fault, tune any HF parameter on the RMU. For information on
additional message annunciations, refer to the manufacturer pilot handbook on HF
communication.
GX_05_029
COM 1 NAV 1
TCAS DSPY 1
ATC-TCAS
HF 1
ADF 1
RANGE: 6 2000
2000
UV
STANDBY ANT
MEMORY-1 TEMP-1
NORMAL
118.00
131.27
1605
131.10
112.00
620.0
HF Line
Select Keys
Cursor Box
GX_05_030
28000 28000
26460
UV UV
HF 1 HF 1
HF 1 Preset Mode HF 1 Active Mode
For Training Purposes Only
Sept 04
5-23
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
HF Fault Annunciation
HF communication control and status are accessed and/or displayed on the “back”
pages of the RMU. These pages are accessed via RMU “PAGE MENU” page:
• HF Control Page
• HF Memory Page
• Maintenance Log
MENU PAGE
The menu page is accessed from the radio tuning page by pressing the PAGE function
key on the front face of the RMU. All stored frequencies are displayed and there are
six memory locations on the first page, and an additional six available on the second
page.
The HF Maintenance Log provides the maintenance log for on-side HF radio
operation. The Maintenance page is a ground maintenance function and will not be
covered in this manual.
GX_05_031
26460
HF 1 ERR
HF 1 Preset Mode
SQ
ID
DIM
PGE
1/2
TST
STO
DME
GX_05_032
SYSTEM 1 PAGE MENU
RADIO PAGE
COM MEMORY
NAV MEMORY
ATC/TCAS
HF CONTROL
HF MEMORY MAINTENANCE
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
5-24 For Training Purposes Only
Sept 04
HF MEMORY AND CONTROL PAGES
The HF Control page provides active and preset channel tuning and emission mode
control, memory channel recall/store, HF status, squelch level tuning, and transmitter
power level tuning.
The HF Memory page provides active channel tuning, memory channel tuning, and
HF status.
SELCAL
The Selective Calling System (SELCAL) monitors the ground stations for a four-letter
tone code that is transmitted to the airplane on the VHF or HF communication
systems. When the SELCAL receives the code, it sends a visual and aural message to
alert the flight crew.
The SELCAL decoder unit located in the avionics equipment bay, has five audio input
channels used to monitor the audio output from:
• VHF COM 1
• VHF COM 2
• VHF COM 3 (Optional)
• HF COM 1
• HF COM 2
GX_05_033
HF 1 MEMORY
MODE: SIMPL
LOAD
MORE
RETURN TO
RADIOS
ACTIVE MEMORY-10
MEMORY-11
MEMORY-12
UV
UV
UV
12260 29000
29209
29200
UV
HF 1 CONTROL
ACT
MODE
:
SQUELCH
LEVEL:
TX
POWER:
PRE
MODE
:
TRANSFER TEMP-1
RETURN TO
RADIOS
ACTIVE MEMORY-10
UV
12260 29000
UV
SIMPL
MAX MAX
SIMPL
For Training Purposes Only
Sept 04
5-25
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
The SELCAL interfaces with the audio integrating system (audio control panels),
flight compartment speakers, and EICAS. Each airplane is assigned its own SELCAL
code at the time of installation. Upon receiving the code for which it was programmed,
the SELCAL will signal the audio integrating and EICAS systems that a call has been
received.
Operation
The VHF and/or HF communication systems are tuned to a SELCAL frequency that
has been assigned to a ground station.
When a ground station wants to talk to the flight crew, the ground station sends a
SELCAL code on the assigned frequency. The SELCAL unit monitors the VHF and
HF communication systems audio output channels.
When a SELCAL signal is received, the decoder checks the signal tones for the correct
frequency, sequence, amplitude and duration.
If all the parameters are met, a SELCAL HF or VHF advisory message will be
displayed on EICAS, and the audio integrating system will command an aural message
“SELCAL, SELCAL” in the flight compartment speakers and headsets.
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