A320飞机维护手册 AMM NAVIGATION 导航4(117)

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

R  the power supply. 
R  Input signals (1030 MHz interrogations/uplinks) are received at 
R  one or both of the antennas. Each received antenna signal is 
R  pulse demodulated and sent to the processing circuits, where the 
R  diversity selection is made. The diversity selection determines 
R  which receiver provides the stronger (or first) signal. The 
R  selected received signal is then applied through a demodulator 
R  circuit to the processing circuits. The processing circuits 
R  determine if the interrogation is an ATC Radar Beacon System 
R  interrogation, a mode S interrogation addressed to the particular 
R  aircraft, or a mode S interrogation addressed to another 
R  aircraft. Depending upon the type of the interrogation, the 
R  processing circuits determine the proper reply (if one is 
R  required) and send the appropriate reply through a message 
R  processing circuit to the diversity switching circuits. The 
R  diversity switching circuits select the antenna that the reply 
R  will be transmitted through. The reply message is transmitted 
R  through the same antenna from which the selected received signal 
R  originated. 
R  - The I/O circuit is an interface circuit to receive serial ARINC 
R  429 data, the 24 bit address input, the code altitude input and 
R  various discretes. The CPU provides the link between the I/O 
R  and the signal processing circuits. 
R  - The signal processing cicuits consist of a video processor, a 
R  PAM decoder and a message processor. The video processor 
R  analyzes the received signals ( pulses and pulse amplitude). If 
R  the received signal is valid, the PAM decoder determines the 
R  type of interrogation. Then the decoder ouput is sent to the 
R  message processor where appropriate reply format is generated.

 

R  - The message processor output is amplified and the resultant 
R  1090 MHz transmit signal is applied to the antennas through a 
R  diplexer/diversity switch. 
R  - The received signals from the antennas are sent to the receiver 
R  stage. The 60 MHz IF output is used to drive the video 
R  processor and the message processor (DSPK function). The input 
R  of the receiver stage is filtered to reduce the susceptibility 
R  to HIRF signals. 
R  - The power supply is a pulse-width modulated switching 
R  regulator. It supplies all the necessary DC voltages required 
R  by the internal circuitry. An integrated monitoring function 
R  gives protection to the power supply circuits and reset signals 
R  to the CPUs each time primary power is applied. 
R  (c) Outputs 
R  The discrete output from transponder is : 
R  -------------------------------------------------------------------------------
R  NAME ELECTRICAL LEVEL TO SIGNAL STATUS 
R  -------------------------------------------------------------------------------
R  XPNDR FAIL OC/5VDC CTL UNIT - ATC 5VDC = FAULT 
R  -------------------------------------------------------------------------------
R  (5) Not Applicable
 **ON A/C ALL
 B. ATC/TCAS Control Unit
 (Ref. Fig. 010)
 The processor-based unit conforms to the ARINC 718 specification.
 The front panel is integrally lit by clear 5V lamps and features :
 - a liquid crystal display window in which the identification code is
 displayed
 - an ATC FAIL indicator light which indicates a transponder failure
 - a IDENT pushbutton switch
 - an ALT RPTG/ON/OFF switch which controls the transmission of altitude
 data from the transponder to the ATC ground control stations
 - a keyboard to select the four-digit transmit code (from 0000 to 7777)
 - a 1/2 selector switch which enables the operation of the ATC system 1
 or 2
 - a STBY/AUTO/ON selector switch which enables the ATC operating modes
 - a TCAS mode selector switch (STBY/TA/TA-RA) which enables the ATC/TCAS
 operating modes (Ref. 34-43-00 for more details).
 - a THRT/ALL/ABV/BLW selector switch which controls the type of traffic
 to be displayed as well as the above and below vertical altitude for
 traffic advisory. 
　
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：A320飞机维护手册 AMM NAVIGATION 导航4(117)