Transponder decoder/encoder circuitry

Details Transponder decoder/encoder circuitry Transponder decoder/encoder circuitry

1976-05-20

1979-01-16

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 956

Patent

active

041351878

ABSTRACT:
A single crystal controlled oscillator provides clock pulses that are used to drive both the decoder shift register and the encoder shift register of an ATC transponder. An input pulse of the interrogation signal from a ground station is shifted down in the decoder shift register and is time correlated with a subsequent pulse of the input signal to verify the validity of the interrogation. A valid interrogation signal triggers gate logic circuitry which loads data into the encoder shift register. The clock pulses from the oscillator are processed to the appropriate frequency for driving the encoder shift register, which outputs serial data for transmission as a coded reply signal responsive to the interrogation signal. The decoder shift register and cooperating edge trigger coincidence gate circuitry suppress side lobe interrogation signal and inhibit operation of the transponder when same are present.

REFERENCES:
patent: 2671850 (1954-03-01), Marcou
patent: 3079557 (1963-02-01), Crabtree
patent: 3512154 (1970-05-01), Farrar
patent: 3715750 (1973-02-01), Bishop
patent: 3721906 (1973-03-01), Geesen et al.
patent: 3949397 (1976-04-01), Wagner et al.
patent: 4067011 (1978-01-01), Althaus

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