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and airtoground
communications, operates in
the 2.0000 to 29.9999 Mhz range and consists of:
· Two transceivers/antenna couplers.
· One antenna.
The basic radio control functions are:
· HF COM mode and frequency.
· Audio selection and volume control.
Frequency and mode control of the remotely located HF radios can be input from either the RMUs or
the Flight Management System (FMS) CDUs. Both normal Simplex Tuning mode and Emergency
Tuning mode are supported by the FMS. The audio control panels provides microphone selection,
radio headset/speaker audio selection, volume control and audio control switching.
The HF transceiver units (HF COM 1 and HF COM 2) are located in the Aft Avionics Bay. The HF
antenna coupler units are located in the upper Aft Fuselage. The antenna is located in the Vertical
Stabilizer (forms the leading edge).
The RMUs are the central control for the HF Communication System, providing complete capability
for controlling the operational mode and frequencies. Each RMU has the capability to control
operation of its primary (onside)
radio or its secondary (crossside)
radio.
The HF information on each RMU is displayed at the lower right of the radio tuning page. HF
emission mode and status are displayed in the HF window. In order to tune a frequency on HF, one
of the two line select keys on the lower right side of the RMU is pressed. This selection will place the
“cursor tune box” around the frequency to be tuned and using the RMU tuning knobs will accomplish
the desired frequency. The HF System can operate in the following modes: Upper Sideband Voice
(UV), Lower Sideband Voice (LV), Amplitude Modulation Equivalent (AM) and Continuous Wave
(CW).
RMU HF DISPLAY
GF0610_045
ATC/TCAS ADF1
HF1
COM1 NB NAV1
118.00 131.10
131.27
MEMORY−1 TEMP−1
1605 620.0
2000
STANDBY ANT
UV
112.00
HF Line Select Keys
Cursor Box
2000
ALT:REL
NORMAL
TCAS DSPY 1
COMMUNICATIONS
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
06−10−21
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
pushtotalk
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
Flight Crew Operating Manual Rev 3, Apr 25, 2005
CSP 700−5000−6
Volume 2
06−10−22
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 onside
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
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