GB405623A - Improvements in high frequency inductance devices - Google Patents

Improvements in high frequency inductance devices

Info

Publication number
GB405623A
GB405623A GB13029/32A GB1302932A GB405623A GB 405623 A GB405623 A GB 405623A GB 13029/32 A GB13029/32 A GB 13029/32A GB 1302932 A GB1302932 A GB 1302932A GB 405623 A GB405623 A GB 405623A
Authority
GB
United Kingdom
Prior art keywords
units
core
coil
tuning
chicago
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB13029/32A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Laboratories Inc
Original Assignee
Johnson Laboratories Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Johnson Laboratories Inc filed Critical Johnson Laboratories Inc
Publication of GB405623A publication Critical patent/GB405623A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
    • H01F21/06—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by movement of core or part of core relative to the windings as a whole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/12—Variable inductances or transformers of the signal type discontinuously variable, e.g. tapped

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

405,623. Inductances; transformers; adjusting wireless apparatus. JOHNSON LABORATORIES, Inc., 609, West Lake Street, Chicago, U.S.A.-(Assignees of Polydoroff, W. J. ; 609, West Lake Street, Chicago, U.S.A.) May 5, 1932, No. 13029. Convention date, May 7, 1931. [Class 37.] Tuning-apparatus for wireless receivers comprises one or more variable inductance units each having a fixed coil and a longitudinally movable core of finely divided magnetic particles, the coil and core being completely enclosed in an electrical screen and provided with external tuning control means. The coils 4 which have a ratio of length to diameter of 1.5 to 1, or 2 to 1, and have an inductance variation from maximum to minimum of about 8 to 1, are carried by telescoping shield parts 7, each coil sliding in an annular slot 2 in its core 1. The core parts are secured to the shield sections 6. The units are mounted on a base-plate 8 and are adjusted by rack-and-pinion 16, 17, a pointer 19 being associated with a scale 20 which has a pin-and-slot connection with one of the units. The units are independently adjustable upon the base-plate for matched tuning. In another construction, four units are combined in a frame-work, and the adjustment is effected by belt-and-pulley gear. Specification 403,368 is referred to. The Specification as open to inspection under Sect. 91 includes a number of diagrams of impedance networks, tuned oscillator and amplifier circuits. These diagrams do not appear in the Specification as accepted.
GB13029/32A 1931-05-07 1932-05-05 Improvements in high frequency inductance devices Expired GB405623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US405623XA 1931-05-07 1931-05-07

Publications (1)

Publication Number Publication Date
GB405623A true GB405623A (en) 1934-02-05

Family

ID=21911671

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13029/32A Expired GB405623A (en) 1931-05-07 1932-05-05 Improvements in high frequency inductance devices

Country Status (1)

Country Link
GB (1) GB405623A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE741789C (en) * 1938-10-09 1943-11-17 Neosid Hansgeorg Pemetzrieder Adjustable iron variometer coupled with a display device
DE743931C (en) * 1939-07-02 1944-01-07 Telefunken Gmbh Adjustment device for high frequency variometer
DE971852C (en) * 1938-08-17 1959-04-09 Georg Von Schaub Tuning device, especially for tuning radio devices

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971852C (en) * 1938-08-17 1959-04-09 Georg Von Schaub Tuning device, especially for tuning radio devices
DE741789C (en) * 1938-10-09 1943-11-17 Neosid Hansgeorg Pemetzrieder Adjustable iron variometer coupled with a display device
DE743931C (en) * 1939-07-02 1944-01-07 Telefunken Gmbh Adjustment device for high frequency variometer

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