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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. 
　
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