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COMMUNICATIONS
For Training Purposes Only
May 03
6-9
P I LOT T R A I N I N G GU I D E
Antenna Coupler
The antenna coupler matches the impedance of the transceivers to the antenna as
different frequencies are selected and keyed.
Antenna
The antenna is an integral part of the leading edge of the vertical stabilizer. The
antenna is connected to the antenna coupler units via an RF strap.
High voltages and currents are present in this area during
transmissions.
Selective Calling (SELCAL)
Both HF transceivers are coupled to a SELCAL system, which monitors the selected
HF frequencies for the airplane’s unique SELCAL code without requiring the crew to
continuously monitor the HF audio. If the code is detected, an EICAS message and an
audio alert are triggered to advise the flight crew that a ground station is calling. The
EICAS message is reset when the appropriate HF transceiver is keyed to transmit.
Controls and Indicators
The HF communication system controls and indicators are described in the following
sections of this chapter:
• Audio control panel is described in Audio Integrating System
• RTU and reversionary / inhibit panel are described in Radio Tuning System
CAUTION
COMMUNICATIONS
6-10 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
HF Communication System - Block Diagram
Figure 6-4
AUDIO SYSTEM
SELCAL
IAPS
ANTENNA
COUPLER
#1
ANTENNA
COUPLER
#2
A
B
A
B
HF COMM
NO.1
XCVR
HF COMM
NO.2
XCVR
COPILOT'S RTU
REVERSIONARY /
INHIBIT PANEL
DC
UTILITY
BUS 2
DC
UTILITY
BUS 2
PILOT'S RTU
P604_06_004
DC
BUS 1
DC
BUS 1
INHIBIT PUSH
1-RTU-2 FMS TUNE
1 2
AFCS
SEL
STBY
1 2
ATC
SEL
FMS
TUNE
INHIB
RTU 1
INHIB
RTU 2
INHIB
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM1
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
REL
IDENT
DME-H
1/2
BRT
BRT
116.30
ACT PRE
111.35
NAV1
ACT PRE
121.90 149.10
COM2
373.0
ADF 1 TCAS
TA
ATC1
NEXT
PAGE 5540
TONE
REL
COMMUNICATIONS
For Training Purposes Only
May 03
6-11
P I LOT T R A I N I N G GU I D E
Radio Tuning System
Description
The radio tuning system provides integrated control of airplane communication and
navigation radio subsystems. It supports full cross-side and reversionary tuning, thus
allowing single-point control of both on-side and cross-side radios from the pilot or
copilot positions.
Components and Operation
The radio tuning system consists of the following components:
• two radio tuning units (RTUs)
• one reversionary / inhibit panel
For the Flight Management System (FMS) tuning of communications, refer to Chapter
17 Navigation Systems under the heading “TUNE PAGE” in the FMS section.
Controls and Indicators
Radio Tuning Unit (RTU)
Line Select Keys
The RTU has eight panel-mounted line select keys adjacent to the display, four on the
left and four on the right of the display. Each key has a mechanical, momentary,
nonlatching action. The functions performed by these keys vary with each display
presented.
Dedicated Pushbuttons (IDENT, DME-H and 1/2)
There are three dedicated function pushbuttons on the RTU. These pushbuttons have
mechanical, momentary, nonlatching actions, but may have latched functions
implemented by system software.
Tune Knob Cluster
Two concentric knobs are used to tune frequencies (or select codes) for the RTU —
both knobs are rate-aided. The functions controlled by the tuning/code knobs include:
• active frequency/code
• preset frequency/code
• numbered preset channels in the preset field only
• HF COM squelch/emission mode values
COMMUNICATIONS
6-12 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
The function to be tuned is selected using the line select keys. A tuning window is
displayed around the frequency/code to be tuned to confirm the selection.
Tuning Window
The tuning window is displayed as a rectangle around the frequency/code to be tuned
or modified. The default position for the tuning window on the primary top level
　
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