GB549459A - Improvements in or relating to variable permeability tuning systems - Google Patents

Improvements in or relating to variable permeability tuning systems

Info

Publication number
GB549459A
GB549459A GB6446/41A GB644641A GB549459A GB 549459 A GB549459 A GB 549459A GB 6446/41 A GB6446/41 A GB 6446/41A GB 644641 A GB644641 A GB 644641A GB 549459 A GB549459 A GB 549459A
Authority
GB
United Kingdom
Prior art keywords
coil
winding
turns
oscillator
superimposed
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
GB6446/41A
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 GB549459A publication Critical patent/GB549459A/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
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/06—Driving or adjusting arrangements; combined with other driving or adjusting arrangements, e.g. of gain control
    • H03J1/10—Rope drive; Chain drive

Landscapes

  • Coils Or Transformers For Communication (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

549,459. Inductors. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. May 19, 1941, No. 6446. Convention date, May 17, 1940. [Class 38 (ii)] [Also in Group XXXVI] In a permeability tuning system, for improving tracking between the serial circuit and the oscillator circuit, the effect of an oscillator coil with a variable pitch winding is produced by winding back a few turns so as to be superimposed on the end turns of the winding, the direction of winding being kept the same. Fig. 2 shows an aerial coil 7 and oscillator coil 9 uni-controlled by identical cores 8, 11 connected to a frame 49; 50 slidable by means of a cord 53 and knob 52. To facilitate tracking, the last few turns 10 of coil 9 are wound back over the other turns, keeping the winding direction the same and thus producing the effect of a variable pitch winding. Coil 9 is of greater diameter than coil 7 since the frequency range is less. In addition core 8 is made to enter coil 7 slightly in advance of the entry of core 11 into coil 9. In a modification (Fig. 3, not shown) the superimposed turns 10 are wound on an insulating sleeve slidable on the inner turns.
GB6446/41A 1940-05-17 1941-05-19 Improvements in or relating to variable permeability tuning systems Expired GB549459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US335708A US2255680A (en) 1940-05-17 1940-05-17 Variable permeability tuning system

Publications (1)

Publication Number Publication Date
GB549459A true GB549459A (en) 1942-11-23

Family

ID=23312927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6446/41A Expired GB549459A (en) 1940-05-17 1941-05-19 Improvements in or relating to variable permeability tuning systems

Country Status (4)

Country Link
US (1) US2255680A (en)
DE (1) DE971975C (en)
GB (1) GB549459A (en)
NL (1) NL61935C (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227128A (en) * 1966-01-04 Indlca ixing m mechanism
NL59335C (en) * 1940-12-05
BE446844A (en) * 1941-08-16
DE942098C (en) * 1942-09-10 1956-04-26 Siemens Ag Sliding variometer with earth core for an oscillating circuit consisting of a fixed capacitance and changeable inductance
US2417182A (en) * 1942-10-24 1947-03-11 Rca Corp Short-wave permeability tuning system
US2424506A (en) * 1942-10-24 1947-07-22 Rca Corp Permeability-tuned short-wave spread-band receiver
US2475032A (en) * 1945-03-17 1949-07-05 Rca Corp Variable permeability tuning system
US2542579A (en) * 1945-03-22 1951-02-20 Admiral Corp Connector
US2512258A (en) * 1945-09-13 1950-06-20 Colonial Radio Corp Decimal push-button tuning system
US2531231A (en) * 1945-12-04 1950-11-21 Rca Corp Variable permeability tuning device
US2505111A (en) * 1946-03-20 1950-04-25 Stanley A Hall Tuning mechanism
US2525438A (en) * 1946-04-01 1950-10-10 Robert P Wuerfel Circuit tuning unit
US2477749A (en) * 1946-04-04 1949-08-02 Aladdin Ind Inc Inductor tuning system
US2438359A (en) * 1946-08-01 1948-03-23 Philco Corp Television receiver circuits and apparatus
US2618707A (en) * 1946-11-01 1952-11-18 Raytheon Mfg Co Combination radio receiver and hearing aid
US2508840A (en) * 1947-04-19 1950-05-23 Aladdin Ind Inc Permeability tuner mechanism
US2520985A (en) * 1947-10-22 1950-09-05 Motorola Inc Antenna coupling circuit
US2555475A (en) * 1948-04-30 1951-06-05 Rca Corp Radio receiver tuning mechanism
US2543551A (en) * 1948-06-10 1951-02-27 Stackpole Carbon Co Variable inductance core structure

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113603A (en) * 1931-05-07 1938-04-12 Johnson Lab Inc High-frequency inductance device
GB408271A (en) * 1932-10-05 1934-04-05 Edward John Wyborn Improvements in or relating to permeability tuning for radio apparatus
GB434675A (en) * 1933-04-22 1935-09-06 Johnson Lab Inc Improvements in or relating to tuning systems for wireless receiving apparatus and the like
US2038281A (en) * 1934-03-05 1936-04-21 Johnson Lab Inc Radio receiving apparatus
DE757101C (en) * 1938-10-06 1954-02-08 Telefunken Gmbh Arrangement for achieving a frequency-linear tuning curve in a receiver
US2190048A (en) * 1939-04-10 1940-02-13 Johnson Lab Inc Permeability-tuned oscillator tracking arrangement

Also Published As

Publication number Publication date
US2255680A (en) 1941-09-09
NL61935C (en)
DE971975C (en) 1959-05-06

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