Video processor for air traffic control beacon system

Details Video processor for air traffic control beacon system Video processor for air traffic control beacon system

1982-09-28

1985-09-10

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1380

Patent

active

045409862

ABSTRACT:
A circuit for use in a transponder located in an aircraft or the like for identifying a true side lobe suppression signal being transmitted by a ground located transmitted system. The true side lobe suppression signal includes at least pulses P1 and P2. The circuit causes the transponder to produce a reply signal upon the amplitude of the P1 pulse being a predetermined ratio to said P2 pulse. The circuit includes a pair of transistors with a capacitor connected to the output of the second transistor. The pulses P1 and P.sub.2 are supplied to the base electrode of the first transistor. Pulse P1 turns on the two transistors and charges the capacitor to a predetermined level so that when the second pulse P2 arrives, it does not turn on a transistor when it is equal to or less than the first pulse P1.

REFERENCES:
patent: 3176291 (1965-03-01), Majerus et al.
patent: 3178706 (1965-04-01), Clock
patent: 3259897 (1966-07-01), Strathman

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