Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1985-09-12
1987-11-03
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 77, 455 92, 455127, 455 12, 34087011, 34087028, 34087039, 34082572, H04B 104, H04B 700
Patent
active
047047356
ABSTRACT:
A system and method for detecting when a satellite is within range of a small, battery-operated, portable transmitter so as to activate the transmitter only when the satellite is within range of the transmitter. The electronic system utilizes a sensitive radio-frequency receiver which can be tuned to receive a unique down-link signal from the orbiting satellite. The signal is amplified and demodulated and then input to a microprocessor. Information is stored in the memory of the microprocessor which identifies the unique down-link signal. The microprocessor compares the demodulated signal with the stored signal and if the two match, the earth-based transmitter is turned on and allowed to transmit for an interval of time. The microprocessor is maintained in a normally "full-stop" mode wherein power to the microprocessor is essentially turned off, and the microprocessor is periodically switched on so that it can check for the presence of the uniquely identifiable down-link signal which triggers transmission.
REFERENCES:
patent: 2818502 (1957-12-01), Steward
patent: 2864943 (1958-12-01), Schultz
patent: 3470481 (1969-09-01), Myers et al.
patent: 3967202 (1976-06-01), Batz
patent: 4398286 (1983-08-01), Geesen et al.
patent: 4449248 (1984-05-01), Leslie et al.
patent: 4479125 (1984-10-01), Mori
patent: 4479255 (1984-10-01), Geesen et al.
patent: 4484356 (1985-11-01), Geesen et al.
"Data Flow in the Synchronous Meteorological Satellite System" by Ames et al. 10/1970.
Beaty David W.
Swapp Mavin C.
Ng Jin F.
Telonics, Inc.
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