777 AIRCRAFT MAINTENANCE MANUAL
HF SYSTEM -INTERFACES
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HF SYSTEM -INTERFACES
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BOEING PROPRIETARY -Copyright # -Unpublished Work -See title page for details.
VERY HIGH FREQUENCY COMMUNICATION SYSTEM -INTRODUCTION
General * VSWR -voltage standing wave ratio
The very high frequency (VHF) communication system permits voice and data communication over line-of-sight distances. It permits communication between airplanes or between ground stations and airplanes.
The VHF system operates in the VHF aeronautical frequency range of 118.000 MHz to 136.975 MHz.
Abbreviations and Acronyms
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ACP -audio control panel
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AIMS -airplane information management system
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AM -amplitude modulation
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AMU -audio management unit
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capt -captain
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CMCF -central maintenance computing function
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DCGF -data conversion gateway function
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DCMF -data communication management function
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DFDAF -digital flight data acquisition function
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ELMS -electrical load management system
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F/O -first officer
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F/OBS -first observer
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HF -high frequency
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MAT -maintenance access terminal
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pnl -panel
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PTT -push to talk
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RF -radio frequency
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RTP -radio tuning panel
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SSB -single side band
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VHF -very high frequency
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VERY HIGH FREQUENCY COMMUNICATION SYSTEM -INTRODUCTION
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VHF SYSTEM -GENERAL DESCRIPTION
General * Data conversion gateway function (DCGF). The VHF transceiver gets air/ground discretes from DCGF and uses The VHF communication system uses three VHF systems. Each its air/ground logic to define flight legs for its internal fault memory.
VHF system has: * Data communication management function (DCMF). The
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DCMF supplies data communications control and services
A VHF antenna
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for airplane air/ground datalink on the VHF system.
A VHF communication transceiver.
General Description
The VHF communication system connects with:
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Three radio tuning panels (RTPs). The RTPs send tuning
data to the VHF communication transceiver.
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The audio management unit (AMU). Microphone audio and
mic switch discretes go to the VHF transceiver through the
AMU. Receiver audio goes from the VHF communication
transceiver to the speakers and headsets through the AMU.
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The SELCAL decoder. The SELCAL decoder starts an alert
when a call comes in for that airplane.
The VHF communication system also connects with the airplane information management system (AIMS) for these functions:
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Digital flight data acquisition function (DFDAF). The DFDAF in
the AIMS cabinet receives the mic switch signals for input to
the flight data recorder.
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Central maintenance computing function (CMCF). The CMCF
gets fault reports from the VHF system and records this
information in a fault history. This shows the maintenance
crew the faulty component or function.
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VHF SYSTEM -GENERAL DESCRIPTION
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VHF SYSTEM -FLIGHT DECK COMPONENT LOCATIONS
VHF System Component Locations
The radio tuning panels (RTPs) are in the aft aisle stand panel.
Other Systems Component Locations
The audio control panels (ACPs) are part of the flight interphone system. They have an interface with the VHF communication system.
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VHF SYSTEM -FLIGHT DECK COMPONENT LOCATIONS
EFFECTIVITY BEJ ALL 23-12-00 中國航空網 m.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：777 AMM 飛機維護手冊 通訊 Communications 1(9)
