Tuning circuits with bendable U-shaped variable inductor for garage door actuators
First Claim
1. In an ultra-high frequency operating transmitter unit and receiver unit of a garage door actuator, a closed loop circuit for use as a tank circuit in the transmitter unit and as a tuning circuit in the receiver unit, each said closed loop comprising:
- an insulating board;
a pair of laterally spaced printed-circuit conductive paths formed on the surface of said insulating board;
a fixed capacitor having the terminals thereof connected across one of the ends of said conductive paths; and
a tuning element in the form of a generally U-shaped conductive wire extending crosswise to said conductive paths with the terminals thereof respectively connected to the opposite ends of said conductive paths;
whereby each said tank and tuning circuit can be tuned to operate at the same frequency by varying the inductance of said closed loop circuit by bending said U-shaped conductive wire about its terminals to change its angular position with respect to said conductive paths.
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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.
17 Citations
5 Claims
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1. In an ultra-high frequency operating transmitter unit and receiver unit of a garage door actuator, a closed loop circuit for use as a tank circuit in the transmitter unit and as a tuning circuit in the receiver unit, each said closed loop comprising:
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an insulating board; a pair of laterally spaced printed-circuit conductive paths formed on the surface of said insulating board; a fixed capacitor having the terminals thereof connected across one of the ends of said conductive paths; and a tuning element in the form of a generally U-shaped conductive wire extending crosswise to said conductive paths with the terminals thereof respectively connected to the opposite ends of said conductive paths; whereby each said tank and tuning circuit can be tuned to operate at the same frequency by varying the inductance of said closed loop circuit by bending said U-shaped conductive wire about its terminals to change its angular position with respect to said conductive paths. - View Dependent Claims (2, 3, 4)
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5. In a remote control system for a garage door actuator including an oscillatory circuit in the transmitter unit for controlling the frequency of oscillation of a carrier signal modulated by a binary coded pulse train and an oscillatory circuit in the receiver unit for controlling the frequency of oscillation thereof so that it can receive the modulated carrier signal, each said oscillatory circuit including a closed loop circuit comprising:
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an insulating board; a pair of laterally spaced printed-circuit conductive paths formed on the surface of said insulating board; a fixed capacitor having its terminals respectively soldered to one of the ends of said conductive paths; a generally U-shaped conductive wire extending crosswise to said conductive paths with the terminals of its legs respectively soldered to the opposite ends of said conductive paths; said pair of conductive paths and said U-shaped conductive wire forming a variable inductor in parallel with said fixed capacitor; and said U-shaped conductive wire being bendable about its terminals so as to vary the angular position of the legs thereof relative to said conductive paths so as to vary the inductance of said inductor and thereby the operating frequency of said oscillatory circuit.
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Specification