Communications: electrical – Continuously variable indicating – With meter reading
Patent
1982-07-08
1984-11-27
Gensler, Paul L.
Communications: electrical
Continuously variable indicating
With meter reading
334 71, 334 46, 334 44, 336122, 333185, H04Q 914
Patent
active
044853823
ABSTRACT:
Tuning elements are provided for use in varying the inductance of the oscillatory circuits of the transmitter and receiver units of garage door actuators operating at ultra-high frequencies. Each oscillatory circuit is a closed loop circuit fabricated on a printed circuit board. The closed loop circuit comprises a pair of printed circuit conductive paths having a fixed capacitor connected across one of the ends thereof and a discrete generally U-shaped wire connected across the other of the ends thereof. The conductive paths and the U-shaped wire comprise the inductor of the oscillatory circuit. By bending the discrete U-shaped wire at its connections with respect to the plane of the printed circuit board, the inductance of the oscillatory circuit in each unit can be adjusted as needed so that they both operate at the same resonant frequency.
REFERENCES:
patent: 1841317 (1932-01-01), Carlson
patent: 2560685 (1951-07-01), Cooper
patent: 2656517 (1953-10-01), Johnson
patent: 2875338 (1959-02-01), Holmes
patent: 2880400 (1959-03-01), Tollefson
patent: 3422379 (1969-01-01), Granquist
patent: 3947934 (1976-04-01), Olson
patent: 4366482 (1982-12-01), Remes et al.
Gensler Paul L.
Lee Benny
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