Pager having receiving frame tuned by transducer

Details Pager having receiving frame tuned by transducer Pager having receiving frame tuned by transducer

1985-03-21

1987-05-05

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

340384E, 368255, C08B 300

Patent

active

046636242

ABSTRACT:
A pager is described for use in an electronic watch. The pager comprises a frame (1) for picking up a magnetic signal and a piezoelectric transducer (11) having a static capacitance on its terminals, for producing a sound. 11
To improve sensitivity of reception, a switching circuit (15) connects the transducer (11) in parallel with the frame (1) to tune it by means of the static capacitance to the frequency of the magnetic signal carrier wave. To increase the performance of the transducer (11 ) when it operates as a sound transmitter, the switching circuit (15) connects the frame (1) in series with the transducer (11).

REFERENCES:
patent: 3937004 (1976-02-01), Natori et al.
patent: 4362399 (1982-12-01), Fick

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