The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 1987
Filed:
Sep. 12, 1985
Mavin C Swapp, Mesa, AZ (US);
David W Beaty, Mesa, AZ (US);
Telonics, Inc., Mesa, AZ (US);
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.