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AUDIOELECTRONIC CONTROLUNIT
TO RTU 1
TO RTU 2
PTTTO SELCAL
X--TALK
IAPS
FMS <0024,0050>
SELCAL <0010>
PTTFROMAECU
VHF Communication Interface <MST> Figure 05---30---3
Vol. 1
05-
30-
6
REV56,Jan 31/03
<0008><0011><0014>
PA
<0008><0014><0060>
PA
VHF/COMM 2
RX/TX AUDIO PTT
ANTENNA
PORTA
PORTB
ECHO
PORTC
AUDIO
OUT
Flight Crew Operating Manual
MASTER
CSP A-
013
COMMUNICATIONS Vol. 1 05-
30-
7
Radio Communication System REV 56, Jan 31/03
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 SystemSystem Receivers/ Transmitters VHF COM 3 DC ESS 4 D12 <0008> <0014> <0081> <0084>
Radio TuningRadio Tuning Unit RTU 1 D13
RTU 2 DC BUS 2 2 K4
Backup Tuning Unit EMER TUNING DC BAT 1 Q4
Flight Crew Operating Manual MASTER
CSP A-
013
COMMUNICATIONS Radio Communication System Vol. 1 05-
30-
8
REV 56, Jan 31/03
THISPAGEINTENTIONALLYLEFTBLANK
Flight Crew Operating Manual MASTER
CSP A-
013
COMMUNICATIONS Vol. 1 05-
35-
1
HF Radio Communication System REV 56, Jan 31/03
1. HF RADIO COMMUNICATIONS <0011><0060>
A. HF Communications
The single Collins HF communications system (labeledHF ontheRTU)is providedfor long-
range,air-
to-
groundandair-
to-
air communications. TheHFsystemconsistsof aReceiver/transmitter, Coupler, andAntenna.The systemisnormallytunedand controlledbyNo. 2radio tuningunit (RTU). <0011>
The dualCollins HF communications systems (labeledHF ontheRTU’s)are provided forlong-
range,air-
to-
groundandair-
to-
aircommunications. EachHFsystem consistsof aReceiver/transmitter, Coupler, andAntenna. The systemsare normally tunedand controlledbythe respective radio tuning units, RTU1for HF1andRTU2for HF 2. <0060>
The HFsystemprovides amplitude modulation (AM)andsingle sideband(SSB)voice communications ata frequency rangeof2to 30MHz. Thesystem has280,000 communication channels (tunedat100Hz steps), and16programmable preset channels. <0011>
The HFsystems provide amplitude modulation (AM)andsingle sideband(SSB)voice communications atafrequency rangeof2to 30MHz. Eachsystemhas280,000 communication channels (tunedat100Hz steps), and16 programmable preset channels.<0060>
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