Duplex communication transceiver with modulation cancellation

Details Duplex communication transceiver with modulation cancellation Duplex communication transceiver with modulation cancellation

1983-12-05

1985-05-28

Orsino, Jr., Joseph A.

Multiplex communications

Wide area network

Packet switching

370 32, 455 76, 455 87, H04B 320, H04L 514

Patent

active

045204748

ABSTRACT:
A duplex FM communication transceiver 10 is disclosed in which a modulated transmit carrier signal is utilized as the receiver first mixer (32) injection signal. The receiver portion of the transceiver comprises dual conversion circuitry, and the transmit information signal used for modulating the transmit carrier signal is phase and amplitude adjusted and then utilized to modulate the receiver second injection local oscillator 41 which provides the input injection signal to the receiver second mixer 36. The second mixer substantially cancels all of the transmit information signal and provides just received information signals to a demodulator 43 which provides audio signals to a speaker 46.

REFERENCES:
patent: 3113269 (1963-12-01), Essam
patent: 3931575 (1976-01-01), Amoroso, Jr.
patent: 4052672 (1977-10-01), Enderby
patent: 4134068 (1979-01-01), Richardson
patent: 4186344 (1980-01-01), Higuchi
patent: 4194151 (1980-03-01), Gregersen
patent: 4231116 (1980-10-01), Sekiguchi
patent: 4238850 (1980-12-01), Vance
patent: 4449250 (1984-05-01), Kurby
"Advanced Mobile Phone System--800 MHZ High Capacity Mobile Radio Telephone", Instruction Manual #68P81039E25-A, FIG. 1, showing Mobile transceiver schematic.
"Introduction to Radar Systems", Second Edition, by Merrill I. Skolnik, 1962, pp. 88-91.

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