Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1992-08-03
1994-04-05
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
4551932, 4551933, 4552262, 4552342, 455289, 455290, 455291, H04B 100
Patent
active
053013581
ABSTRACT:
A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the matching network, such as a varactor diode, and is swept from a minimum value to a maximum value. This sweeping is desirably performed in discrete voltage steps that correspond to unit increments of varactor capacitance. A feedback signal from the receiver, such as an AGC signal, is monitored during this operation to note which varactor bias signal yields the maximum AGC signal. After the sweep is concluded, the apparatus applies to the varactor the bias voltage that yielded the maximum AGC signal during the sweeping operation. This bias voltage is maintained through the end of the listening interval. At the beginning of the next listening interval, the process may be repeated.
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Gaskill Garold B.
Mukai Larry H.
Eisenzopf Reinhard J.
Galbi Elmer
Keough Timothy H.
Seiko Corp.
Seiko Epson Corp.
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