Crystal controlled transmitter

Details Crystal controlled transmitter Crystal controlled transmitter

1987-02-19

1989-09-05

Safourek, Benedict V.

Telecommunications

Transmitter

Frequency conversion

331 76, 331116R, 3408703, 34082562, 455119, 455129, 343702, H04B 103

Patent

active

048646369

ABSTRACT:
A short distance, battery powered, amplitude modulated, crystal controlled RF transmitter for transmitting encoded security information. In its preferred embodiments, the transmitter comprises a novel fifth overtone crystal oscillator which self-produces a carrier frequency at the third harmonic of the fifth overtone of the crystal's fundamental frequency, which carrier frequency is coupled by a series resonant trap, or a pi network, tuned to the carrier frequency to an amplifier stage where the carrier is amplitude modulated via pulse position encoded binary security data. In an alternative embodiment, the transmitter comprises matched crystal oscillator, tripler and amplifier stages. Also disclosed is an antenna including a battery clip contact.

REFERENCES:
patent: 2884526 (1959-04-01), Cortese
patent: 3108223 (1963-10-01), Hunter
patent: 3311812 (1967-03-01), Geiszler et al.
patent: 3742496 (1973-06-01), Jezo
patent: 4384288 (1983-05-01), Walton
patent: 4591863 (1986-05-01), Patsiokas
patent: 4635296 (1987-01-01), Dinsmore
patent: 4641366 (1987-02-01), Yokoyama et al.

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