IFF Diversity switch

Details IFF Diversity switch IFF Diversity switch

1977-10-25

1979-03-06

Buczinski, S. C.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

307 41, 325370, 328137, 328154, 343 65LC, 343 68R, 343 68LC, 343876, G01S 956, H01Q 324

Patent

active

041433696

ABSTRACT:
An antenna diversity switch for IFF radar equipment not having such a switch incorporated in it. This new diversity switch requires no modification of the existing IFF components. The blanking pulses generated by the IFF system when an interrogating signal is received are used to trigger a monostable multivibrator which stops a free-running flip-flop controlling the switching between two antennas so that the antenna connected at that time remains connected. When the blanking pulses stop, i.e., the interrogating signal is too weak to be received, the monostable multivibrator is returned to its untriggered condition which allows the flip-flop and its controlled antenna switch to resume switching between the antennas. Suitable timing controls are provided to switch antennas at the desired rate and to keep the diversity switch connected to a receiving antenna for a desired delay time after the received interrogating signal ceases. The present diversity switch is wired physically into the IFF system by means of an electrical tee connection simply made in the existing cable line from the IFF system to an antenna switch.

REFERENCES:
patent: 2901743 (1959-08-01), Jacobsen et al.
patent: 2937268 (1960-05-01), Downie et al.
patent: 3037114 (1962-05-01), Bier et al.
patent: 3182263 (1965-05-01), Gossard
patent: 3643256 (1972-02-01), Owen
patent: 3670275 (1972-06-01), Kalliomaki et al.
patent: 3710382 (1973-01-01), Allen
patent: 4041397 (1977-08-01), Bauer et al.

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