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2000
ALT:REL
NORMAL
TCAS DSPY 1
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−20
RMU HF DISPLAY (CONT'D)
The RMU HF window is optimized for use with Upper Sideband voice mode. The HF window has two
modes of operation: Preset Tune mode and Direct Tune mode. Both the active and preset are
displayed when the RMU is in preset tune mode, while only the active frequency is displayed in direct
tune mode.
The HF will keep the most recently keyed HF tuned to the antenna for 20 seconds after the
push-to-talk key opens. Following 20 seconds the HF reverts to “Dual Receive mode” (neither HF
antenna remains tuned to the antenna) providing the squelch is not open.
HF Preset and Direct Tuning Modes
GF0610_046
HF 1 Active Mode
HF1
28000
UV
26460
HF1
28000
UV
HF 1 Preset Mode
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.
HF Fault Annunciation
GF0610_047
HF1
26460
ERR
HF communication control and status are accessed and/or displayed on “back” pages of the RMU.
These pages are accessed via RMU “PAGE MENU” page:
• HF Control Page.
• HF Memory Page.
• Maintenance Log.
COMMUNICATIONS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−21
RMU HF DISPLAY (CONT'D)
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.
GF0610_048
SYSTEM 1 PAGE MENU
COM MEMORY
NAV MEMORY
HF CONTROL
HF MEMORY
ATC/TCAS
RETURN TO
SYS SELECT
MAINTENANCE
RADIOS
COMMUNICATIONS
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
06−10−22
RMU HF DISPLAY (CONT'D)
HF Memory and Control Pages
The HF Control page provides active and preset channel tuning, 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.
GF0610_049
HF 1 MEMORY Page HF 1 CONTROL Page
HF 1 MEMORY
12260
MODE:
ACTIVE
LOAD
29000
MORE
RETURN TO
RADIOS
UV
MEMORY−10
UV
29209
MEMORY−11
UV
29200
MEMORY−12
UV
SIMPL
HF 1 CONTROL
12260
MODE
ACTIVE
TRANSFER
29000
RETURN TO
RADIOS
UV
PRESET
UV
TEMP− 1
ACT :SIMPL
LEVEL
SQUELCH:MAX POWER
TX :MAX
M PORDEE :SIMPL
COMMUNICATIONS
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
06−10−23
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 forward avionics equipment bay, has five audio input
channels used to monitor the audio output from:
• VHF COM 1.
• VHF COM 2.
• VHF COM 3 (On airplanes with SB 700-23-002 incorporated).
• HF COM 1.
• HF COM 2.
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.
　
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