VHF SYSTEM -DATA RECEIVE/TRANSMIT INTERFACES
General
To receive and transmit data, the VHF communication system uses the three radio tuning panels (RTPs) and only two VHF communication transceivers. These components continuously communicate with the airplane information management system (AIMS) during data communication.
Discrete Interfaces
The transceivers get a voice/data select signal from AIMS. The voice/data signal selects the voice or data transmission mode of the transceiver.
The selected transceiver receives a data keyline signal from AIMS. The data keyline signal starts the data transmission.
Tuning Interfaces
AIMS uses ARINC 429 buses to send auto-tuning frequencies to the left, right, and center RTPs. The RTPs send the tuning frequencies to the center transceiver or to the right transceiver.
Data Interface
The transceivers get audio uplink data from ground stations and send it to AIMS on ARINC 618 buses.
The AIMS data communication management function (DCMF) sends the audio downlink data to the transceivers on ARINC 618 buses. The transceivers send this data to the ground communication stations.
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VHF SYSTEM -AIMS FAULT REPORTING AND TESTING INTERFACES
General
The VHF communication system sends fault information to the airplane information management system (AIMS) from the VHF transceivers and the radio tuning panels (RTPs).
VHF Communication Transceiver Interfaces
The transceivers send real time fault and status information to the AIMS cabinets.
AIMS data conversion gateway function (DCGF) sends air/ ground information to the transceiver.
The transceivers use the AIMS central maintenance computing function (CMCF) for on ground maintenance tests. The right AIMS cabinet CMCF sends ground maintenance test requests to the left AIMS cabinet. The left AIMS cabinet CMCF sends all test requests to the VHF transceivers. The transceivers return the test requests to the CMCF.
RTP Interfaces
The AIMS central maintenance computing function (CMCF) sends transceiver status to the RTPs.
The RTPs send fault status information to the AIMS cabinets.
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VHF SYSTEM -VHF COMMUNICATION TRANSCEIVER
Purpose
The VHF communication transceiver changes RF signals to audio signals during receive and changes audio signals to RF signals during transmit.
General Description
The transceiver has:
BEJ 006-999
* 8.33 KHz frequency spacing
BEJ 001-005
* 25 KHz frequency spacing
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*
118 MHz to 136.975 MHz frequency range
*
25 watts minimum output power.
Controls and Indications
The LED indicators show the status of the VHF system after you do a self-test from the front panel. These are the LED indicators on the front panel:
*
LRU, shows a failure of the transceiver
*
CONTROL, shows a failure of the ARINC 429 input
*
ANTENNA, shows a failure of the antenna.
The TEST switch starts a 100 msec system self test. This includes these tests:
* Transceiver self-test
*
Input serial tuning word test
*
Antenna VSWR test.
All LEDs turn red for about two seconds. Then the LRU LED turns green and all other LEDs remain red for about 2 seconds. All LEDs turn off for about 2 seconds. Then the LRU LED comes on green for about 30 seconds and the CONTROL and ANTENNA LEDs turn off.
The LRU LED turns red after the self-test shows a failure.
The other LEDs come on red after the self-test to show a failure.
The self-test done from the MAT does the same tests but does not show the LED indications.
Phone and Mic Jacks
Phone and mic jacks give connection points for headphones and microphone.
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VHF SYSTEM -VHF COMMUNICATION ANTENNA
General Description
The VHF communication antenna receives and transmits RF signals in the VHF frequency range.
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本文链接地址：777 AMM 飞机维护手册 通讯 Communications 1(11)
