Full duplex transceiver comprising hybrid coil and automatic imp

Details Full duplex transceiver comprising hybrid coil and automatic imp Full duplex transceiver comprising hybrid coil and automatic imp

1978-12-26

1981-01-20

Brigance, Gerald L.

Multiplex communications

Wide area network

Packet switching

179170G, 333129, 455 79, H04B 158

Patent

active

042465826

ABSTRACT:
Data signals are transmitted from a transmission unit (12) through a hybrid coil (16) and transmission line (18) to a remote transceiver. Data signals of a different frequency are received from the remote transceiver through the transmission line (18) and hybrid coil (16) in a full duplex mode and passed to a reception unit (26). A ratio of the signal levels of the received data signals passed through the hybrid coil (16) in a desired manner to transmitted data signals which leak through the hybrid coil (16) in an undesired manner is sensed at a reception signal output of the hybrid coil (16). The resistance of a variable resistance pad (17) provided in the transmission line (18) is varied in accordance with the sensed ratio so as to adjust the ratio to a predetermined optimum value. The sensed ratio is a predetermined function of the impedance of the transmission line (18) as viewed from the hybrid coil (16). The amplification factors of transmission and reception amplifiers (14), (22) are also varied to compensate for variations in attenuation of the transmitted and received signals by the resistance pad (17).

REFERENCES:
patent: 3336540 (1967-08-01), Kwartiroff et al.
patent: 3577202 (1971-05-01), Brightman
patent: 3810182 (1974-05-01), White et al.
patent: 3822366 (1974-07-01), O'Dea et al.
patent: 3867589 (1975-02-01), Juner
patent: 3891947 (1975-06-01), Debost et al.
patent: 4028645 (1977-06-01), Tressa

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