Telecommunications – Transmitter and receiver at separate stations
Patent
1990-11-16
1993-09-21
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
4551802, 455228, 34082544, H04Q 700
Patent
active
052477002
ABSTRACT:
A compact and unitary cellular/pager. The cellular/pager includes a cellular antenna for receiving UHF cellular and paging signals. The cellular/pager also includes a VHF paging antenna. Every paging signal is sent to a paging receiver. The paging receiver uses the same circuitry to process either the UHF or VHF page. This is accomplished by setting a voltage controlled oscillator (VCO) to one of two frequency ranges. The chosen frequency is either added or subtracted to the incoming signal in order to match a constant intermediate frequency. The resultant signal is demodulated and a bit rate is selected by a decoder, under the control of a microprocessor. Therefore, the paging receiver can choose a band, a channel and a bit rate. Cellular signals are sent to a cellular block. Cellular location information is utilized by the cellular/pager to form an internally updated roaming pager. That is, the cellular location information is automatically conveyed by the cellular block, under the control of the microprocessor, to a paging service. The paging service then knows the location of the paging receiver, consequently the paging service can direct the pager to await for a page at a single frequency, thereby eliminating frequency scanning by the pager or manual updates by the user.
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Adams Erich B.
Hendershot James
Lloyd Graham P.
Naugler, Jr. W. Edward
Wohl James P.
Eisenzopf Reinhard J.
Universal Cellular, Inc.
Urban Edward
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