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US 5,136,719 AGranted
Automatic antenna tubing method and apparatus
AssigneesSeiko Corp., Seiko Epson Corporation
InventorsGarold B. Gaskill, Larry H. Mukai
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AssigneesSeiko Corp., Seiko Epson Corporation
InventorsGarold B. Gaskill, Larry H. Mukai
Estimating the term…
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.
A radio receiver which is periodically activated to receive a packet of information, comprising:
A wristwatch paging receiver operative during recurrent time slots for receiving paging messages, comprising:
A radio receiving apparatus comprising:
In a method of operating a paging receiver in an area that has a radio signal that contains both paging data and a high power signal component that has a spectral power density higher than that of said paging data, said paging receiver including means for receiving said radio signal, said paging receiver including both a matching network for optimizing signal transfer between an antenna and the receiver, and a phase locked loop based demodulator circuit for extracting paging data from the signal, said matching network being operable during a tuning interval, an improvement comprising:
A method of operating a receiver in a system, said receiver including timing means for dividing time into a series of recurrent time slots, and wherein said receiver is operative during recurrent time slots to receive a message modulated on a signal, the receiver including an antenna tuning circuit, an improvement comprising the step:
In an antenna matching/tuning network for a radio receiver that includes tuning means for tuning said receiver, a varactor diode and bias means for biasing the diode successively at a number of different bias levels during operation of said tuning means when the receiver is operating on a single frequency, an improvement comprising the step:
Dependencies are inferred from the claim text.