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 XA  is inhibited preventing the transponder from replying if a
 XA  suppression pulse is received from another L band equipment
 XA  installed on the A/C.
 XA  (4) The decoder/encoder determines the mode of received signal (A, B,
 XA  C or D). The corresponding decoder gate is opened and a start
 XA  pulse is applied to the mode memory.
 XA  (5) The mode memory generate output which place the transponder in
 XA  reply mode of operation: video processor is inhibited, suppressor
 XA  signal enable the modulator and through the external suppressor
 XA  amplifier is applied to other L band equipments. The clock and
 XA  decoder/encoder in encode mode generate reply pulses applied to
 XA  the reply gates.
 XA  (6) When a valid mode A or B interrogation signal (8 microsecond or 17
 XA  microsecond pulse pair) is received and decoded the A/B enable
 XA  output of the mode memory is applied to the control matrix. The
 XA  output of the control matrix permits the enable reply gates to
 XA  supply a pulse to the modulator.
 XA  The setting of the code select switches on the control unit enables
 XA  the reply gates corresponding to the selected code.
 XA  (7) When a valid mode C (21 microsecond pulse pair) interrogation
 XA  signal is received and decoded, the altitude enable output of the
 XA  mode memory is applied to the control matrix and if the altitude
 XA  report switch of the control Box is ON position, permits the
 XA  altitude code signal from te CADC to control the reply gates.
 XA  (8) Principle of D mode operation (28 microsecond pulse pair
 XA  interrogation signal) reserved for future expansion is identiqual.
 XA  (9) The modulator output pulses are applied to the transmitter which
 XA  delivers 500 watt peak power pulses at 1090 MHZ through the
 XA  diplexer to the antenna.
 (10) The coding of the identification reply is determined by the setting
 of the identification coding switches on the ATC control module.
 Additionally, an IDENT button in the ATC control module, when
 pressed momentarily during mode A or B interrogation, causes an
 additional single identification pulse to be transmitted for 20
 seconds at the end of each train of coded reply signals.

 EFFECTIVITY

 IB ALL  CONFIG 3  01 Page 9  Dec 25/8734-53-00
 (11) Altitude reporting may be initiated in mode A, or B if the ALT REPORT switch is in the ALT REPORT position. Altitude reporting is initiated upon the reception of a 21-microsecond interrogation pulse pair from the ground station. During altitude reporting, digital altitude data from the CADC is applied to the gate in the ATC transponder. The position (1 or 2) of the ATC switch on the ATC control module determines whether altitude data from CADC 1 or CADC
 is utilized by the ATC system. (12) The operational status of the two ATC transponders is controlled by the function selector and the ATC switch on the ATC control module.
 XA  When the
 XA XA XA  function selector is set to STBY the power supply provides power to all circuits in both transponders. The ATC system is placed in operation by setting the function selector to A or B. The turn-onsignal is applied to the control matrix of either ATC 1 or ATCtransponders as determined by the position of the ATC switch.
 XA
 (13) Switching of altitude data from either of the two central air data computers (CADC) to the ATC system is illustrated in figure 4. Twelve altitude encoding electronic switches within each CADC altitude encoder are opened or closed in accordance with the coded digital equivalent of the airplane altitude. A flag switch within the CADC is closed whenever the altitude data is valid and the CADC
 is operating normally. With the ATC switch on the ATC control module set to position 1, current flows through the ATC switch, through the flag switch, and through any of the altitude encoding switches that are closed to cause a voltage drop across the corresponding resistors in ATC 1 transponder gate. The digital altitude code is picked off of the twelve resistors and encoded by the gate for transmission to the ground station. With the ATC switch in position 1, therefore, ATC 1 receives altitude data from CADC 1. Likewise, with the ATC switch in position 2, ATC 2 receives altitude data from CADC 2.
 XA XA XA XA XA XA XA XA XA XA XA XA XA XA XA XA XA  (14) Action on the self test button of the Control bus or of thetransponder front panel permits a rapid check of the operationalstatus of the transponder. The self test oscillator, controlledby the control matrix delivers an interrogation signal to thepreselector. If no fault exist a reply is generated.(15) The control box contains a fault light and a reply light. Thetransponder front panel contains a reply light included in the selftest switch and two fault indicators (R/T and ANT). The monitorcircuit supplies signal to these to provide indication of theoperational status of the equipment. When four consecutive repliesare completed the reply lights are momentory energized. If afault occurs, the fault lights on the control box and one of thetwo indicators on the transponder front panel are energized thefault lights will remain for 15 seconds longer than the faultcondition exists. The ANT fault indicators on the transponder isreset by depressing the reset switch on the front panel. The R/Tindicators is reset by grounding a terminal inside the unit.
　
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