Channeling and decode circuit for airborne radio-telephone syste

Details Channeling and decode circuit for airborne radio-telephone syste Channeling and decode circuit for airborne radio-telephone syste

1982-06-10

1984-02-28

Ng, Jin F.

Telecommunications

Transmitter and receiver at separate stations

455 34, 455 35, 455 38, 455 77, 455166, 34082513, 34082552, 34082569, 34082565, H04B 100, H04B 700, H04Q 700

Patent

active

044345046

ABSTRACT:
An airborne radio-telephone transceiver is provided having improved channeling and decode circuitry compatible with the selective signalling call-up system prescribed by the Federal Communications Commission. The decode circuitry includes a filter and detector dependent only on reception of a single selected frequency transmitted as a call-up signal by a ground station. A retriggerable, resettable, monostable multivibrator, configured as a pulse swallower, provides the necessary counter offset for proper call-up signal decoding. The invention includes scanning circuitry for rapid operator selection of active transmit-receive channels in the operator's geographic area.

REFERENCES:
patent: 3426279 (1969-02-01), Berman
patent: 3535636 (1970-10-01), Muilwijk
patent: 3840811 (1974-10-01), Blouch
patent: 3859475 (1975-01-01), Wulfsberg
patent: 3919646 (1975-11-01), Morgan
patent: 3961261 (1976-06-01), Pflasterer
patent: 4155040 (1979-05-01), Harmon et al.

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