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is transmitting.
Frequency Readouts
Displays frequencies set on
COM 1 and NAV 1 radios.
Tuning Selector
Selects COM 1 or
NAV 1 for tuning.
<0012>
RTU INHIBIT PUSH
Used to disable a failed radio tuning
unit and enable cross--side tuning.
RTU 1 or 2 INHIBIT (white) light
comes on to indicate that radio
tuning unit is disabled.
Transponder Selector Switch
1 -- Number 1 transponder is activated;
number 2 transponder on standby.
STBY -- Both transponders on standby.
2 -- Number 2 transponder is activated;
number 1 transponder on standby.
REV 56, Jan 31/03
Vol. 1 05--30--6
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
VHF Communication Interface <MST>
Figure 05---30---3
VHF/COMM 1
RX/TX
AUDIO
PTT
PORT A
PORT B
ECHO
PORT C
AUDIO
OUT
VHF/COMM 2
RX/TX
AUDIO
PTT
PORT A
PORT B
ECHO
PORT C
AUDIO
OUT
AUDIO ELECTRONIC
CONTROL UNIT
SELCAL
PTT FROMAECU
FMS
IAPS
X--TALK
AUDIO CONTROL PANELS
PTT TO
SELCAL
ANTENNA ANTENNA
<0010>
TO RTU 2
TO RTU 1
<0060>
PA
PA
<0008> <0014> <0060>
<0008> <0014>
1 -- VHF -- 2 INT/SVC
PA
VHF 3
<0008> <0011> <0014>
PA
<0011>
1 -- VHF -- 2 INT/SVC
PA
HF
<0024,0050>
Vol. 1 05--30--7
REV 56, Jan 31/03
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
C. System Circuit Breakers
SYSTEM SUB--SYSTEM CB NAME BUS BAR CB
PANEL
CB
LOCATION
NOTES
VHF COM 1 DC BAT 1 Q3
VHF COM 2 DC BUS 2 2 H11
Radio
Communication
Receivers/
Transmitters
VHF COM 3
DC ESS 4
D12
<0008>
<0014>
<0081>
System
<0084>
Radio Tuning RTU 1 D13
Unit RTU 2 DC BUS 2 2 K4
Backup
Tuning Unit
EMER
TUNING DC BAT 1 Q4
REV 56, Jan 31/03
Vol. 1 05--30--8
COMMUNICATIONS
Radio Communication System
Flight Crew Operating Manual MASTER
CSP A--013
THIS PAGE INTENTIONALLY LEFT BLANK
Vol. 1 05--35--1
REV 56, Jan 31/03
COMMUNICATIONS
HF Radio Communication System
Flight Crew Operating Manual
CSP A--013
MASTER
1. HF RADIO COMMUNICATIONS <0011> <0060>
A. HF Communications
The single Collins HF communications system (labeled HF on the RTU) is provided for
long--range, air--to--ground and air--to--air communications. The HF system consists of
a Receiver/transmitter, Coupler, and Antenna. The system is normally tuned and
controlled by No. 2 radio tuning unit (RTU). <0011>
The dual Collins HF communications systems (labeled HF on the RTU’s) are provided
for long--range, air--to--ground and air--to--air communications. Each HF system
consists of a Receiver/transmitter, Coupler, and Antenna. The systems are normally
tuned and controlled by the respective radio tuning units, RTU 1 for HF 1 and RTU 2 for
HF 2. <0060>
The HF system provides amplitude modulation (AM) and single sideband (SSB) voice
communications at a frequency range of 2 to 30 MHz. The system has 280,000
communication channels (tuned at 100 Hz steps), and 16 programmable preset
channels. <0011>
The HF systems provide amplitude modulation (AM) and single sideband (SSB) voice
communications at a frequency range of 2 to 30 MHz. Each system has 280,000
communication channels (tuned at 100 Hz steps), and 16 programmable preset
channels. <0060>
The HF receiver/transmitter is installed in the aft equipment compartment and contains
the receiving, transmitting and processing circuits required for operation of the system.
The unit interfaces with the antenna coupler to control the antenna tuning. It also sends
signals to the audio control unit for microphone, headphone, speaker operation and
ADF. <0011>
The HF receiver/transmitter is installed in the aft equipment compartment and contains
the receiving, transmitting and processing circuits required for operation of the system.
The unit interfaces with the antenna coupler to control the antenna tuning. It also sends
signals to the audio control unit for microphone, headphone, speaker operation, ADF
and SELCAL decoder. <0010><0011>
The HF receiver/transmitters are installed in the aft equipment compartment and
　
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