Pager with reverse paging facility

Details Pager with reverse paging facility Pager with reverse paging facility

H - Electricity

04

B

H04B 7/26 (2006.01) G01S 1/20 (2006.01) H04B 5/04 (2006.01)

Patent

CA 2104555

ABSTRACT OF THE INVENTION Position determining apparatus including at least one base station including a base transmitter which periodically transmits timing signals and a plurality of mobile remote units. Each remote unit includes a mobile receiver operative to receive timing signals transmitted by at least one base transmitter; synchronization circuitry receiving the timing signals and providing a spread-spectrum frequency-hopping sequence characteristic of the particular remote unit; a mobile transmitter producing a radiated frequency-hopped signal responsive to the frequency-hopping sequence and the timing signal; and message generator operative to modify the radiated frequency-hopped signal to transmit a message to the at least one base station.

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