Accession Number : ADD001091

Title :   3 To 8 Megahertz Miniature Tuner.

Descriptive Note : Patent,


Personal Author(s) : Lyman,Harold T

Report Date : 20 Dec 1966

Pagination or Media Count : 3

Abstract : The patented tuner comprises a coil which is surrounded by a ferrite cylinder. A ferrite ring is located at one end of the coil. The inner core is tapered, being smallest at its end which is inserted in the coil. A portion of this smaller diameter end is made of carbonyl iron while the remainder of the core is made of ferrite. A second ferrite ring is located on the ferrite end of the inner core. A metallic shield surrounds the entire tuning element. At the lowest tuned frequency the magnetic circuit is nearly closed by the ferrite cylinder, the two ferrite rings, and the inner core. The resulting tuner has a high Q due to the small amount of magnetic leakage.

Descriptors :   *Tuning devices, *Patents, High frequency, Miniature electronic equipment, Coils, Ferrites, Magnetic cores, Receivers

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE