Auto balancing duplexer for communication lines

Details Auto balancing duplexer for communication lines Auto balancing duplexer for communication lines

1980-02-11

1982-03-16

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 32, 179170NC, H04B 158

Patent

active

043204988

ABSTRACT:
A circuit for generating a control signal for use in a communication line duplexer or other isolation means. The transmitted signal at the output of the duplexer is phase detected to detect its real and imaginary components. These components are used to modulate the transmitted signal which is then injected into a feedback loop of the duplexer. This substantially cancels the transmitted signal at the output of the duplexer. The circuit permits the communication line to be terminated in a constant impedance.

REFERENCES:
patent: 3993867 (1976-11-01), Blood
patent: 4238850 (1980-12-01), Vance

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