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BUS 2 CB2--E9
CB2--E8
RX AUDIO
MIC AUDIO
PTT
RF
ADF 1
AUDIO
INTEGRATING
SYSTEM
SELCAL
DECODER
SELCAL
ANTENNA
CB1--E10 HF COUPLER 1
CONTROL IN
CONTROL OUT
CONTROL OUT
RF
CONTROL IN
ARINC 429
CB1--E9
CB1--E8
RF
HF
RECEIVER/
TRANSMITTER
2
HF
RECEIVER/
TRANSMITTER
28 VDC 1
BUS 1
HF 1
HF 1
HF 1
HF 2
HF 2
HF 2
<0010>
28 VDC
BUS 1
Vol. 1 05--35--5
REV 56, Jan 31/03
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
Communication RTU --- HF COM Page <MST>
Figure 05---35---3
ACT LINE KEY
Select and use large
tuning knob to window
either squelch level,
active frequency or
operating mode.
HF COM ACTIVE
DISPLAY <0011>
SIMPLEX / DUPLEX
LINE KEY AND
ANNUNCIATOR
Used to alternately
select SIMPLEX or
DUPLEX tuning
modes. Larger
annunciator indicates
the tuning mode
selection.
HF COM PRESET
DISPLAY
PRESET PAGE
LINE KEY
Used to select
PRESET
page.
RETURN LINE KEY
Used to return to the
main display page.
PRE LINK KEY
Used to window
the preset HF COM
frequency.
TUNE/ ITU LINE
KEY AND
ANNUNCIATOR
Used to alternately
select EMER
channel tuning,
FREQ tuning,
PRESET tuning, or
ITU channel
tuning.
POWER LINE KEY
Used to alternately
select LO, MED, or
HI transmit power
levels.
HF1 COM ACTIVE
DISPLAY <0060>
REV 56, Jan 31/03
Vol. 1 05--35--6
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
Communication RTU --- HF Preset Page <MST>
Figure 05---35---4
ACT LINE KEY
Used to window the
squelch annunciator.
Turn the large tuning
knob to move the
window to either the
frequency or operating
mode annunciator.
SQUELCH LEVEL
DISPLAY
Use the small tuning
knob to change the
squelch level.
NEXT PAGE LINE KEY
Used to display the next
four preset HF data
blocks (up to 16).
PRESET FREQ
NUMBER
Number (1 to 16) of
the HF preset data
block.
PRESET LINE KEY
Push once to move
the tuning window to
the desired HF
preset data block.
Push twice to transfer
the preset data block
to the ACT display.
SIMPLEX FREQ
DISPLAY
Shows the preset
frequency when
operating in
SIMPLEX mode.
PRESET OPERATING
MODE
LV, UV, or AM
DUPLEX RECEIVE
FREQ DISPLAY
Shows the preset
receive--frequency when
operating in DUPLEX
mode.
DUPLEX TRANSMIT
FREQ DISPLAY
Shows the preset
transmit--frequency
when operating in
DUPLEX mode.
<0011>
<0060>
Vol. 1 05--35--7
REV 56, Jan 31/03
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
B. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
Single HF
R di
Receiver/
HF
E8
Radio
Communication
Transmitter DC BUS 2 2 E9
System <0011> Coupler HF CPLR E10
Receiver/ HF 1
E8
Transmitter DC BUS 1 1 E9
Dual HF Radio
Communication
Coupler HF CPLR 1 E10
System <0060> Receiver/ HF 2
E8
Transmitter DC BUS 2 2 E9
Coupler HF CPLR 2 E10
REV 56, Jan 31/03
Vol. 1 05--35--8
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 05--40--1
REV 56, Jan 31/03
COMMUNICATIONS
Data Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
1. DATA COMMUNICATIONS <0082>
Data communications consists of the Airborne Communications Addressing and Reporting
System (ACARS) The ACARS provides the capability to route messages between the
aircraft and the ground--based data link service providers. The ACARS enables the aircraft
to function as an airborne communications terminal and performs airline operational
communications and limited air traffic service functions.
The ACARS operates with the flight management system to transmit downlink messages
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