Multiplex communications – Wide area network – Packet switching
Patent
1983-07-05
1987-08-04
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 32, 455 86, H04J 100, H04J 1500
Patent
active
046850996
ABSTRACT:
Method and apparatus for a duplex communication system wherein a local station transmits a modulated signal at a nominal, fixed frequency f.sub.1 to a remote station which transmits, simultaneously, to the local station, a modulated signal at a nominal, fixed frequency f.sub.2, which frequency f.sub.2 is displaced from frequency f.sub.1, by a frequency .vertline.f.sub.2 =f.sub.1 .vertline. being the intermediate frequency of the receivers at both the first and second stations. Novel transmitter signal suppression is provided in the circuits of the local and remote stations so that a common transmit-receive antenna may be utilized at each station without swamping either receiver's front-end circuits on transmission and optimum conversion gain may be realized on reception.
REFERENCES:
patent: 3733608 (1973-05-01), McGhay et al.
patent: 4032723 (1977-06-01), Mendoza
patent: 4051475 (1977-09-01), Campbell
patent: 4212013 (1980-07-01), Biethan et al.
patent: 4231116 (1980-10-01), Sekiguchi et al.
Harrison Michael R.
White Donald R.
Arant Gene W.
Chin Wellington
Kleinberg Marvin H.
Maxon Electronics Co. Ltd.
Olms Douglas W.
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