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in compliance with ARINC 429.
This message can be received by the port A or the port
B of the transceiver. The RMP performs the selection
by a discrete.
The message can be made up of a one word of 32 bits
or two words of 32 bits for the 100 Hz spacing or CW
mode. A microprocessor performs the decoding of the
frequency and mode ( AM or USB ).
The microprocessor, inside the HF transceiver, checks
the message from the Radio Management Panel and
controls the system operation. In case of failure it
controls the illumination of the lights located on the
face of the transceiver and is recorded in the BITE
memory.
SDAC
The connection between the HF transceiver and the
System Data Acquisition Concentrator ( SDAC ) enables
the use of the HF system in transmission mode to be
recorded .
The connection is obtained through the PTT switch.
In case of continuous emitting during more than one
minute, the ECAM displays in amber:
COM: HF 1 EMITTING
AMU
The HF system is linked to the Audio Management Unit
for connection to the audio integrating and SELective
CALling (SELCAL) system.
The Audio Control Panels (ACPs) are used for HF
transmission or reception selection mode and control
of the received audio signal levels through the AMU.
LGCIU
The Landing Gear Control and Interface Unit indicates
the flight or ground status of the aircraft.
This information is used by the HF BITE, in order to
count the flight legs in case of CFDIU failure.
CFDS
For maintenance purposes, Built In Test Equipment is
integrated in the HF transceiver.
The BITE functions of the HF transceiver are monitored
by the Centralized Fault Display System.
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23 - COMMUNICATIONS
23-12-00 VHF SYSTEM PRESENTATION
CONTENTS:
Purpose
Principle
Components
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VHF SYSTEM PRESENTATION
PURPOSE
The VHF system allows short distance voice
communications between different aircraft (in flight
or on ground) or between the aircraft and a ground
station.
The VHF is used for short range voice communications.
PRINCIPLE
For voice communications, the crew uses acoustic
equipment.
- side-stick radio selectors,
- loudspeakers,
- oxygen-masks,
- boomsets,
- headsets,
- hand-microphones.
The Audio Management Unit (AMU) acts as an interface
between the crew and the VHF system.
The Audio Control Panels (ACPs) allow selection of the
VHF1,VHF2, or VHF3 transceiver in transmission or
reception mode and for the control of the received
audio signal.
The Radio Management Panels (RMPs) serve to select the
VHF frequencies.
The VHF transceiver, tuned on the frequency selected
by one of the 3 Radio Management Panels (RMPs),
transforms the audio signals into VHF signals (in
transmission mode) or VHF signals into audio signals
(in reception mode).
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VHF SYSTEM PRESENTATION
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VHF SYSTEM PRESENTATION
COMPONENTS
Let’s see the main components of the VHF system.
The VHF system comprises:
- 3 VHF transceivers (1),
- 3 blade antennae,
associated with control systems:
- 3 RMPs (2),
- 3 ACPs (2),
- 1 AMU (1).
　
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