曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
NOTE : RMP 3 is optional.
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VHF SYSTEM PRESENTATION - COMPONENTS
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23 - COMMUNICATIONS
23-12-00 VHF SYSTEM DESCRIPTION/OPERATION
CONTENTS:
VHF Tranceiver
RMPs
SDAC
Audio Management Unit (AMU)
Landing Gear and Control Interface Unit (LGCIU)
CFDS
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VHF SYSTEM DESCRIPTION/OPERATION
VHF TRANCEIVER
The Very High Frequency system serves for all
short-range voice communications between different
aircraft in flight or between the aircraft and ground
stations.
The VHF system operates within the frequency range of
118.00 to 136.975 MHz.
RMPs
The RMPs are used for VHF frequency control and
display.
The VHF transceiver has 2 serial input ports : Serial
input port A for normal use and serial input port B
in case of an RMP failure.
The port selection is done through the port selection
information signal.
The selected frequency information sent to the VHF
system is a serial 32-bit word.
The VHF requires one serial 32-bit word for complete
tuning data.
SDAC
The SDAC acquires the VHF Push To Talk signal and
provides this information to the ECAM and the DFDRs.
In case of continuous emitting, the ECAM displays :
COM: VHF 1 CONT EMITTING
AMU
The VHF system is linked to the Audio Management Unit
for connection to the audio integrating and SELective
CALling (SELCAL) systems.
The Audio Control Panels (ACPs) are used for VHF
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 aircraft status. This information
is used by the VHF BITE, in order to count the flight
legs in case of CFDIU failure.
CFDS
For maintenance purposes, a Built In Test Equipment
is integrated in the VHF transceiver.
The BITE functions of the VHF transceiver are monitored
by the Centralized Fault Display System.
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23-51-00 SELCAL SYSTEM PRESENTATION
CONTENTS:
SELCAL Philosophy
SELCAL Operation
Self Examination
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SELCAL SYSTEM PRESENTATION
SELCAL PHILOSOPHY
The selective calling system provides visual and aural
indication of calls received from ground stations
equipped with a coding device.
The ground station tone generator provides the assigned
aircraft code which modulates a VHF (or an HF)
transmitter.
In order to receive the SELCAL CALL, the same frequency
as on the ground must be activated in the aircraft.
SELCAL: SELective CALling system
This function is integrated in the AMU. The A/C code
can be set on the SELCAL code panel fitted in the
avionics bay.
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