Telecommunications – Transmitter – Plural separate transmitters or channels
Patent
1986-01-31
1988-02-02
Ng, Jin F.
Telecommunications
Transmitter
Plural separate transmitters or channels
455129, 358186, 333109, H04B 104, H04N 538
Patent
active
047233079
ABSTRACT:
A noncontact switch couples power from A and B radio frequency sources to a load and an antenna in three modes. Mode I couples the A source to the antenna and the B source to the load; Mode III is B to antenna and A to load, and Mode II couples both A and B sources to the antenna. The structure includes a first 3dB, 90.degree. coupler coupled to the sources and a second 3db, 90.degree. coupler coupled to the load and the antenna. A third 3dB, 90.degree. coupler is coupled in a first path between the first and second couplers. A pair of reflective terminations coupled to ports of the third coupler are mechanically controllable to one of three phase-shift conditions; 0.degree. for mode I, 90.degree. for mode II and 180.degree. for mode III. A fixed phase shifter couples the first and second 3dB, 90.degree. couplers by a second path. Each reflective phase shifter is a coaxial circuit including the parallel combination of first and second series inductance-capacitance circuits. A gap in the hollow center conductor is used to provide the capacitance. A conductive slug sliding in the hollow controls the capacitance.
REFERENCES:
patent: 2437067 (1948-03-01), Bingley
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patent: 4602227 (1986-07-01), Clark et al.
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"Produce Improvement Bulletin", by Harris Corporation.
English-Language Translation of a 1982 NHK Technical Report, NHK 8-2-82, entitled "A Crossover-Type System for Switching 10-kw VHF Television Broadcasting Transmitters".
Report ITEJ 10-4-82, entitled "A 10-kw VHF Transmitter Using a Continuous Change-Over Switch".
"Principles of Radar" by Reintjes and Coate, published 1962 by McGraw-Hill, pp. 635-636.
"Microwave Engineering" by A. F. Harvey, published in 1963 by Academic Press, pp. 107-115.
Clark Raymond N.
Schmitz Anthony N.
General Signal Corporation
Hubbard Robert R.
Huberfeld Harold
Mednick Jeffrey S.
Ng Jin F.
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