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• integrated avionics processor system (IAPS)
Transceivers
Two VHF-422B transceivers contain the circuits required for transmission and
reception of radio signals, and processing of audio signals.
Antennas
There are two VHF antennas located as follows:
• VHF 1 antenna - upper side of the fuselage
• VHF 2 antenna - underside of the fuselage
Integrated Avionics Processor System
The integrated avionics processor system (IAPS) is a card cage assembly that
physically houses some avionic line replaceable units (LRUs). The IAPS reads several
avionic buses and distributes data to those LRUs requiring the information. Most
avionics data is processed by this unit.
COMMUNICATIONS
6-6 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
VHF Communication System - Block Diagram
Figure 6-3
AUDIO SYSTEM
VHF COMM
NO. 1
XCVR
VHF COMM
NO. 2
XCVR
IAPS
FMS FMS
DC
BATT
DC
BUS 2
A
C
C
A
B B
VHF 1
ANTENNA
118.00 - 151.975 MHz
VHF 2
ANTENNA
118.00 - 151.975 MHz
PILOT'S RTU
REVERSIONARY /
INHIBIT PANEL
COPILOT'S RTU
VHF 1
ONLY
P604_06_003
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
6-7
P I LOT T R A I N I N G GU I D E
Controls and Indicators
The VHF communication system controls and indicators are described in the
following sections of this chapter:
• Audio control panel is described in the Audio Integrating System
• RTU and reversionary / inhibit panel are described in Radio Tuning System
The VHF transceiver is normally tuned by the on-side RTU. The VHF transceiver may
also be tuned by the cross-side RTU or by the FMS. The VHF transceiver supplies an
audio output to the audio system and a digital bus output to the IAPS. The data output
contains the communication frequency which is echoed back to the RTUs.
COMMUNICATIONS
6-8 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
HF Communication System
Description
The HF communication system consists of two high-frequency (HF) transceivers
(HF 1 and HF 2) which operate independently.
Communication range on HF frequencies is longer (potentially global), but less
reliable than on conventional VHF and UHF frequencies, and varies substantially with
factors such as operating frequency, season, time of day, atmospheric noise, and solar
activity.
Components and Operation
The HF communication system consists of the following components:
• two transceivers
• two couplers
• one antenna
Associated components:
• two radio tuning units (RTUs)
• two audio control panels
• one reversionary / inhibit panel
• one SELCAL decoder
• Integrated Avionics Processor System (IAPS)
Transceivers
The transceivers provide signal processing for transmission and reception. The unit
consists of a control module, RF/IF module, frequency synthesizer, frequency
standard, power supply/audio module and a power amplifier.
The transceivers provide amplitude modulated (AM) and single sideband (SSB) longrange
voice communications in the frequency range of 2 to 30 MHz, selectable in
increments of 100 Hz. Limited preset channel selection is also available and a
SELCAL (selective calling) feature is incorporated.
The two HF transceivers are identical and independent. They may be operated
simultaneously in receive mode but only one transceiver at a time can operate in
transmit mode. In a dual HF system configuration, antenna coupler No. 1 and antenna
coupler No. 2 exchange status (interlock) data to ensure that only one transceiver is
connected to the antenna for the transmit mode. When one transceiver is keyed to
transmit, the other transceiver is disconnected from the antenna and is unable to
receive or transmit. Frequency and mode selection is covered in the RTU section.
　
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