Low power transmitter frequency stabilization

Pulse or digital communications – Repeaters – Testing

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Details

455119, 455125, 375 22, H03K 708, H04B 1034

Patent

active

047946229

ABSTRACT:
An improved miniature hand-held low power transmitter utilizing a surface acoustic wave (SAW) resonator as the control element to establish the carrier frequency of the oscillator. The SAW resonator stabilizes the frequency of the transmitter to within 0.05% of the center frequency of the SAW resonator for the condition of the user's hand enclosing the transmitter. This stability allows the companion receiver to operate at a narrow bandwidth, 0.1% of the center frequency of the SAW resonator, thus reducing the spurious noise received by the receiver. The configuration of the transmitter allows schemes such as pulse position or pulse width modulation to be utilized to encode the transmitted information. The physical size of the SAW resonator allows the transmitter to be mounted within a housing small enough to be enclosed by the user's hand.

REFERENCES:
patent: Re29525 (1978-01-01), Willmott
patent: 3868595 (1975-02-01), Capps, Jr. et al.
patent: 4004228 (1977-01-01), Mullett
patent: 4085388 (1978-01-01), Gilden et al.
patent: 4231031 (1980-10-01), Crowther et al.
patent: 4249418 (1981-02-01), Ebata
patent: 4327444 (1982-04-01), Court
patent: 4354166 (1982-10-01), Grudkowski
"LC Oscillators", Electronics Designers' Handbook, Giacoletto, McGraw-Hill, 1977, pp. 16-3 to 16-8.
Woodward et al.; The Radio Amateur's Handbook; The American Radio Relay League Inc.; Newington, Ct.; USA; 1981; pp. 6-3 and 6-4.
Fink et al.; Electronics Engineers' Handbook; McGraw-Hill Book Company; New York; Second Edition, 1982; pp. 13-27.

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