GB571787A - Improvements in variable permeability tuning arrangements - Google Patents

Improvements in variable permeability tuning arrangements

Info

Publication number
GB571787A
GB571787A GB17502/43A GB1750243A GB571787A GB 571787 A GB571787 A GB 571787A GB 17502/43 A GB17502/43 A GB 17502/43A GB 1750243 A GB1750243 A GB 1750243A GB 571787 A GB571787 A GB 571787A
Authority
GB
United Kingdom
Prior art keywords
coil
pitch
oscillator
winding
arrangement
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
GB17502/43A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co Ltd
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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB571787A publication Critical patent/GB571787A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
    • 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
    • H01F21/065—Measures for obtaining a desired relation between the position of the core and the inductance

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

571,787. Permeability tuning; superheterodyne circuits for wireless reception. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Oct. 25, 1943, No. 17502. Convention date, Oct. 24, 1942. [Class 40 (v)] [Also in Group XXXV] A permeability tuning arrangement comprising two or more circuits variably tuned by a unitary control to differing but related frequencies which may be included in a superheterodyne receiver comprises coils which may be of similar construction as regards winding length, coil diameter and wire sizes but have differing winding pitches. The Figure shows a coil arrangement in which tuning cores 5, 7 and coil formers 11, 12 are used. The winding 3, which may be in the signal circuit, is of smaller pitch than the winding 6 in the oscillator circuit. The cores are conjointly operated by screwadjusting devices 16, trimmer adjustments 15 being provided. In this arrangement twopoint tracking is obtained. Tracking at additional points may be secured by the provision of a shunt condenser or condensers connected across one or more tappings on the coils preferably on the coil with the larger winding pitch. The oscillator may have the larger or the smaller winding pitch according as the oscillator frequency is above or below the signal. In a modification, Fig. 1A (not shown), band-spread by the use of an auxiliary series coil as described in Specification 571,858 is used. In this arrangement the pitch of the oscillator coil will depend on (1) the signal frequency range, (2) the intermediate frequency, (3) the size of the band-spread coil relevant to the oscillator coil, and (4) the extent of the spread bands. The Specification gives curves showing the relation between the pitch and the effective permeability but in the case of band-spreading by an auxiliary coil the final oscillator coil pitch is empirically determined. Specifications 546,248 and 549,459 also are referred to.
GB17502/43A 1942-10-24 1943-10-25 Improvements in variable permeability tuning arrangements Expired GB571787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US463192A US2417182A (en) 1942-10-24 1942-10-24 Short-wave permeability tuning system

Publications (1)

Publication Number Publication Date
GB571787A true GB571787A (en) 1945-09-10

Family

ID=23839216

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17502/43A Expired GB571787A (en) 1942-10-24 1943-10-25 Improvements in variable permeability tuning arrangements

Country Status (2)

Country Link
US (1) US2417182A (en)
GB (1) GB571787A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543042A (en) * 1945-05-07 1951-02-27 Standard Telephones Cables Ltd Tuning means for coaxial line conductors
US2505791A (en) * 1946-02-27 1950-05-02 Zenith Radio Corp Inductance tuning apparatus
US2542950A (en) * 1947-05-09 1951-02-20 Stewartwarner Corp Permeability tuned radio receiver
US2561494A (en) * 1947-07-25 1951-07-24 Rca Corp Switchless multiband radio apparatus
US2631192A (en) * 1948-03-06 1953-03-10 Motorola Inc Permeability-tuned coupling unit
US2565261A (en) * 1948-09-11 1951-08-21 Rca Corp Permeability tuning system for superheterodyne receiver
US2770724A (en) * 1952-07-26 1956-11-13 Motorola Inc Converter
US2964955A (en) * 1959-04-29 1960-12-20 Collins Radio Co Slug tuning device

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2082595A (en) * 1933-04-22 1937-06-01 Johnson Lab Inc Inductive tuning system
US2095420A (en) * 1933-09-02 1937-10-12 Johnson Lab Inc Variable inductances for tuned high-frequency circuits
GB447104A (en) * 1935-11-21 1936-05-12 Aladdin Radio Patents Ltd Improvements in or relating to tuning systems for wireless receivers of the supersonic-heterodyne type
US2222387A (en) * 1937-02-16 1940-11-19 Hazeltine Corp High-frequency tunable system and apparatus
US2259250A (en) * 1938-12-01 1941-10-14 Johnson Lab Inc Securing alignment in a plurality of resonant circuits
US2344091A (en) * 1939-02-20 1944-03-14 Johnson Lab Inc Push button operating mechanism for permeability tuning purposes
US2330833A (en) * 1939-03-23 1943-10-05 Belmont Radio Corp Radio control apparatus
US2263613A (en) * 1939-03-31 1941-11-25 Rca Corp Unicontrol variable inductance tuning system
NL58891C (en) * 1940-01-02
US2252092A (en) * 1940-02-29 1941-08-12 Rca Corp Radio tuning means
NL61935C (en) * 1940-05-17
US2310720A (en) * 1941-04-21 1943-02-09 Zenith Radio Corp Antenna coupling and tuning system for communication or broadcast receivers
US2289670A (en) * 1941-07-05 1942-07-14 Johnson Lab Inc Oscillator tracking system
US2301934A (en) * 1942-01-05 1942-11-17 Johnson Lab Inc Multirange high frequency system

Also Published As

Publication number Publication date
US2417182A (en) 1947-03-11

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