Inductor devices – With means to change coil length or connections – With variable number of short-circuited turns
Patent
1989-12-26
1991-10-15
Kozma, Thomas J.
Inductor devices
With means to change coil length or connections
With variable number of short-circuited turns
336150, H01F 2902
Patent
active
050578090
ABSTRACT:
A variable inductance RF coil assembly including an air-core, high-voltage coil, a printed circuit board installed inside of the coil, the circuit board carrying a plurality of switch contacts corresponding in location and in number to the turns of the air coil, a contact plate attached to the circuit board and having contact fingers corresponding in location and in number to the switch contacts, and a rotary, stepped cam cylinder mounted to the circuit board, the cams corresponding in location and number to cam-follower sections of the contact arms on the contact plate. Unidirectional rotation of the stepped cam cylinder causes progressive communication between the cam steps and the cam-follower sections. Such communication causes the contact arms to connect with the switch contacts on the circuit board thereby progressively and continuously shorting out each successive turn of the coil thereby to adjust the inductance thereof.
REFERENCES:
patent: 978604 (1910-12-01), Marriott
patent: 1679503 (1928-08-01), Siegrist
patent: 2691141 (1954-10-01), Hollis
patent: 3265997 (1966-08-01), Olson
patent: 3958196 (1976-05-01), Benzie et al.
patent: 4255734 (1981-03-01), Owen
The Radio Amateur's Handbook, American Radio Relay League, 29th Ed., 1952, pp. 455-456.
The Radio Amateur's Handbook, American Radio Relay League, 40th Ed., 1963, p. 70.
The Radio Amateur's Handbook, American Radio Relay League, 52nd Ed., 1975, p. 26.
Alline, Jr. Emile F.
Chandler Alan S.
Advanced Electronics, Inc.
Harrison David B.
Kozma Thomas J.
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