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NORMAL
121.90
112.00
1605 620.0
131.10
COM 1 NAV 1
TCAS DSPY 1
ATC-TCAS
HF 1
ADF 1
RANGE: 6 2000
2000
UV
STANDBY ANT
TEMP-1 TEMP-1
NORMAL
121.90
131.27 112.00
1605 620.0
131.10
Press and
hold
TO EXIT
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
5-20 For Training Purposes Only
Sept 04
COM MEMORY
To recall stored frequencies, select the cursor to the preselect position on the main
radio page. Rotate the tune control knob to view the frequencies stored (1-12) in
memory.
While on the main tuning page, press the PGE function key and then press COM
MEMORY option. COM MEMORY page will provide the following information:
TUNE
SQ
ID
DIM
PGE
1/2
TST
STO
DME
COM 1 NAV 1
ATC-TCAS ADF 1
MEMORY-1 TEMP-1
118.00
121.90
112.00
113.10
GX_05_027
COM 1 NAV 1
ATC-TCAS ADF 1
MEMORY-2 TEMP-1
118.00
130.27
112.00
113.10
GX_05_028
COM 1 NARROW
MORE INSERT
RETURN DELETE
118.00
121.90
130.27
133.00
MEMORIES
1 4
2 5
3 6
BANDWIDTH
SELECT
Selectable from
Function Keys
Memory
Location
Active COM
Frequency
Bandwidth Select
Annunciator
NOTE:
Pressing the top right
transfer key while on
the COM memory page will
toggle the receiver bandwidth
from narrow to wide or
vice versa.
For Training Purposes Only
Sept 04
5-21
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
HIGH FREQUENCY (HF) COMMUNICATION SYSTEM
The HF communication system is a dual configuration integrated with the radio
system on the airplane. The system provides long range air-to-air and air-to-ground
communications, operates in the 2.0000 to 29.9999-MHz range and consists of:
• Two transceiver/antenna couplers
• One antenna
The basic radio control functions are:
• HF COM mode and frequency
• Audio selection and volume control
NOTE
HF tuning via the RMUs displays the frequency as xxxxx kHz
(the decimal point is not displayed). However, HF tuning via the
FMS displays the frequency on the FMS CDU as yyyyy.y kHz
(the decimal point is displayed). As an example, an entry of
“10000” on the RMU would be entered as “10000.0” on FMS.
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 provide 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 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 (on-side) radio or its secondary
(cross-side) 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
an HF frequency, one of the two line select keys on the lower right side of the RMU is
pressed. This selection will place the “curser 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).
P I LOT T R A I N I N G GU I D E
COMMUNICATIONS
5-22 For Training Purposes Only
Sept 04
RMU HF Display
The RMU HF window is optimized for use with Upper Side Band 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.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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