Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1994-06-03
1996-08-20
Eisenzopf, Reinhard J.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
455 132, 455 541, 455 582, 455 69, 342357, H04B 7185
Patent
active
055488005
ABSTRACT:
A constellation of satellites distributed around the earth serves as a communication network that supports global communication of subscriber units. Subscriber units may potentially transmit from any location on earth. Some locations such as radio astronomy sites may be interfered with by nearby transmissions from subscriber units. Subscriber units located within a potentially interfering proximity to radio astronomy sites are prohibited from transmitting potentially interfering signals by reception of a non-interfering beacon at radio astronomy sites. The beacon repeatedly transmits a synchronous control signal with a subscriber unit's servicing satellite's control signal. The beacon's control signal is compatible with a subscriber unit's communication receiver. Control signal information contained in a beacon control signal inhibits the subscriber unit from transmitting.
REFERENCES:
patent: 4162488 (1979-07-01), Silverman et al.
patent: 5257404 (1993-10-01), Goreham et al.
patent: 5327572 (1994-07-01), Freeburg
"Beacon Control Of Radio Transmitters To Reduce Radio Frequency Interference" by Timothy J. Landrud and John L. Nelson from vol. 16, Aug. 1992, Motorola Technical Developments.
Kurby Christopher N.
Olds Keith A.
Eisenzopf Reinhard J.
Johanson Kevin K.
Motorola Inc.
Nguyen Lee
Nielsen Walter W.
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