Electricity: motive power systems – Supplied or controlled by space-transmitted electromagnetic...
Patent
1986-07-25
1987-08-04
Shoop, Jr., William M.
Electricity: motive power systems
Supplied or controlled by space-transmitted electromagnetic...
318560, 49 25, H04Q 702
Patent
active
046848533
ABSTRACT:
A radio frequency (r-f) transmitter has an electric oscillator circuit for producing an oscillating r-f signal in an antenna. A feedback sub-circuit of the oscillator circuit includes a surface acoustic wave (SAW) resonator for stabilizing the oscillations. The feedback circuit has a Q of less than 12000. There is a modulation sub-circuit of the oscillator circuit which includes a voltage variable capacitor. The voltage variable capacitor responds to input voltage variations to modulate the capacitance of the feedback circuit, thereby modulating the frequency of the transmitter. A garage door opener system employing the transmitter is also disclosed.
REFERENCES:
patent: 3742434 (1973-06-01), Leyde et al.
patent: 3855548 (1974-12-01), Nandi et al.
patent: 3979697 (1976-09-01), Donahue
patent: 4009476 (1977-02-01), Lutz
patent: 4271504 (1981-06-01), Brossard et al.
patent: 4560951 (1985-12-01), Futterer
patent: 4581592 (1986-04-01), Bennett
Precision L-Band SAW Oscillator for Satellite Application, Thomas O'Shea et al., Sawtek, Inc. 6-16-83.
Emhart Industries Inc.
Forest Carl A.
Meyer Robert F.
Ro Bentsu
Shoop Jr. William M.
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