US2363101A - Device for simultaneously tuning oscillatory circuits - Google Patents

Device for simultaneously tuning oscillatory circuits Download PDF

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Publication number
US2363101A
US2363101A US403564A US40356441A US2363101A US 2363101 A US2363101 A US 2363101A US 403564 A US403564 A US 403564A US 40356441 A US40356441 A US 40356441A US 2363101 A US2363101 A US 2363101A
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United States
Prior art keywords
coil
tuning
circuits
inductance
winding
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Expired - Lifetime
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US403564A
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English (en)
Inventor
Heem Jan Van Der
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies
    • 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

Definitions

  • This invention relates to the simultaneous tuning, i. e., by means of equal and synchronous means capable of being set by a single operating member, of two oscillatory circuits whose resonance frequencies must differ by a constant value.
  • a tuning device is used, for example, in superheterodyne receivers in which the input circuit or circuits, hereinafter briefly referred to as the preselector, must be tuned to the signal frequency whilst the local oscillatory circuit must be tuned to a frequency which relative to the signal frequency exhibits a difference equal to the intermediate frequency to which the remaining portion of the apparatus is tuned.
  • the preselector of a superheterodyne receiver also frequently utilises a circuit which must be tuned to the mirror image of the desired signal and whose resonance frequency relative to the signal frequency must consequently have a difference equal to twice the intermediate frequency for which the ap.
  • paratus concerned is designed.
  • the invention more particularly relates to the obtainment of a constant frequency difference between the tuning of two oscillatory circuits tunable with the aid of equal means capable of being set in the same manner, the tuning of these circuits being effected by varying the position of cores of magnetic material relative to the coils so as to vary the inductance active in the circuits.
  • permeability tunning Since the inductance variation with a displacement of the magnetic core is obtained by the variation of the magnetic permeability of the medium comprised by the coil, this'manner of tuning of an oscillatory circuit is frequently referred to as permeability tunning. This term will also be used hereinafter to refer to the tuning method embodying the invention.
  • variable elements which for both circuits give the same variation of the magnitude to be varied and, further, auxiliary elements are included in one or in both circuits, which permit of equalizing the frequency difference to the desired value in at least a certain number of positions of the synchronous tuning means, whilst in the intermediate positions small differences are permissible.
  • Such circuits are known, for example, from Dutch patent specification No. 41,633 for circuits tuned by means of synchronous variable condensers.
  • similar circuits may, of course, be developed for circuits tuned by means of synchronous permeability tuning.
  • these circuits have the drawback that a great many circuit elements must be used, and furthermore, the correct adjustment to the desired difference frequency for all frequencies in thetuning range is not obtained.
  • the invention provides a device for simultaneously tuning two oscillatory circuits
  • winding density is to be understood in this case to mean the number of turns per unit of length, measured in the direction of the axis of the coil.
  • Fig. 1 shows diagrammatically the longitudinal section of a coil having a winding width b constituted by n turns which are wound with constant winding density on the coil bush I.
  • a magnetic core 2 is movable which is preferably a little longer than the winding width b.
  • curve I of Fig. 3 in which on the horizontal axis is indicated on an arbitrary scale the position k of the core relatively to the coil, whereas on the vertical axis, likewise on an arbitrary scale, commencing at the value 1, is shown the ratio between the inductance L with pushed-in core and the inductance Lo of the coil without core.
  • the inductance variation exhibits a quite different curve on inserting the magnetic core, since the field intensity in the axis of the coil will vary i a manner different from that in the coil with constant winding density.
  • Fig. 2 One form of construction of a coil having a nonuniform winding density is shown in Fig. 2 in which the coil bush is again indicated by l and the magneto core by 2.
  • the coil with the wind ing width b is now built up from a certain number of sections of tightly wound wire, the spaces 8 between the various sections being constant but the sections themselves comprising difierent numbers of turns. In the drawing the sections comprise successively 1, 2, 3 (k-l) k turns.
  • the invention is not limited to the said order of numbers ofturns.
  • the number of sections and the series of the numbers of turns in each separate case are determined in accordance with the inductance variation" required. It is alternatively possible to obtain” anoneunifo'rm" winding density in a manner other than that'consisting in winding sections of' diiierent-numberss of turns, for example by making the -numbers oi turns of the sections as Well as' the spaces-between the sections different, or by winding with a variable pitch. It is evident: that: all-:1 these: forms of construction fall under the-scope.-oi.:
  • Fig.4 showsdiagrammatically the use. of adsviceraccording to the invention in a superheteroe dyne receiver.
  • llLindicates amixing tube of which: one .grid has supplied .to. it the signal oscillation having. :atfrequency' fs and another grid the auxiliary oscillation having a frequency. is generatedbythez-local. oscillator, while-"the oscillation: having a frequency fur, being the differencesbetween fa andzfsgistakenirom theanodes.
  • Thezsignalcircuit or:preselection-.circuit; which-is supplied in someway or other'by th aerial l8, is'constitutedby the.coil1 H whose inductance may bevaried bY-"mQaIISJ'Of'"thGi-Slid? able magnetic core' l3, andthe condenser
  • FIG. 5'l shows;aipreselector for a superheteroclyne -apparatus comprising special means for the suppression of the image frequency.
  • I8 is the aerial which supplies the signal to a'preselectorand
  • Ill is themixing'tube which suppliesan oscillation of the intermediatefrequency fm.
  • Aseries resonant circuit 22, 25 which is tunable by means of the magnetic core 23'. Thiscircuit is-tuned to theimage frequencyof the signal'frequencyf5, i.
  • the inductancesof'the coils Zlland 22'- are varied by means: of, a member '24 which displacesihe' two cores'zl and 23 in the same manner. However, inorder'to satisfy the condition that the. parallel circuit and the series. circuit must exhibit a constant frequencyrdifierence, thesaid inductances must be. variedin different manners. and; to difierent exte'nts,.which may be obtainedby utilising a. deviceaccording to. the. invention.
  • apluralityof oscillatory circuitsto resonant frequencies differing-by a substantially constant amount throughout the--tuning range. of the device; the combination of a; plurality, of tuning coils: and movable magnetic cores slidablewithin .theooils for varying the inductance thereof, each of :said coils. having substantially the same. diameter. and winding width and at least'one of said.
  • coils-hay.- ing a winding comprising three'winding sections, each winding section being'spaced from the: adjacently positioned winding section .by a constant amount and having'an inductance;progressively larger than the adjacently -positioned:winding section the: winding width. of saidrcoil being. less than the; length oftthe associated. .core.
  • a .device for simultaneously tuning 31117111.- rality of oscillatory circuits to resonantfrequencies difiering by asubstantiallyconstant amount throughout the tuning range'of'thedevice, the combinationof a. plurality of'tuning: coils and movable magnetic cores slidable within the'coils for varying the inductance thereof, said coils comprising single layer solenoids having substantially the same-diameter and windingwidth and at least-oneof said coils having-awindingcomprising threewinding sections; each winding-section being-spaced from the adjacentlypositioned' By; means of this reactance'

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
US403564A 1940-10-16 1941-07-22 Device for simultaneously tuning oscillatory circuits Expired - Lifetime US2363101A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL231616X 1940-10-16

Publications (1)

Publication Number Publication Date
US2363101A true US2363101A (en) 1944-11-21

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US403564A Expired - Lifetime US2363101A (en) 1940-10-16 1941-07-22 Device for simultaneously tuning oscillatory circuits

Country Status (6)

Country Link
US (1) US2363101A (de)
BE (1) BE450074A (de)
CH (1) CH231616A (de)
FR (1) FR894036A (de)
GB (1) GB605807A (de)
NL (2) NL56233C (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2474761A (en) * 1942-07-15 1949-06-28 Hartford Nat Bank & Trust Co Coil having a slidable core and method of establishing the ratio between the maximumand minimum inductance thereof
US2477749A (en) * 1946-04-04 1949-08-02 Aladdin Ind Inc Inductor tuning system
US2496058A (en) * 1948-05-22 1950-01-31 Rca Corp Permeability tuner
US2505791A (en) * 1946-02-27 1950-05-02 Zenith Radio Corp Inductance tuning apparatus
US2528167A (en) * 1948-03-23 1950-10-31 Rca Corp Band-spread tuning inductance device
US2533810A (en) * 1949-08-13 1950-12-12 Aladdin Ind Inc Wide band calibrated tuner and inductor for use therewith
US2565261A (en) * 1948-09-11 1951-08-21 Rca Corp Permeability tuning system for superheterodyne receiver
US2621324A (en) * 1948-07-21 1952-12-09 Rca Corp Permeability tuned variable inductance
US2645718A (en) * 1950-06-06 1953-07-14 Rca Corp Variable inductance structure
US2750495A (en) * 1951-11-20 1956-06-12 Motorola Inc Receiver which tunes by adjusting magnetic core antenna
US2899654A (en) * 1959-08-11 Variable inductance device
US2979655A (en) * 1957-09-19 1961-04-11 Magnaflux Corp Method and apparatus for detecting flaws
US3017589A (en) * 1958-05-13 1962-01-16 Int Resistance Co Differential transformer
US3052860A (en) * 1945-09-17 1962-09-04 Iii Francis M Walters Radio frequency choke
EP0248329A2 (de) * 1986-06-05 1987-12-09 EWD Electronic-Werke Deutschland GmbH Amplitudenspule für die Zeilenendstufe eines Fernsehempfängers

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899654A (en) * 1959-08-11 Variable inductance device
US2474761A (en) * 1942-07-15 1949-06-28 Hartford Nat Bank & Trust Co Coil having a slidable core and method of establishing the ratio between the maximumand minimum inductance thereof
US3052860A (en) * 1945-09-17 1962-09-04 Iii Francis M Walters Radio frequency choke
US2505791A (en) * 1946-02-27 1950-05-02 Zenith Radio Corp Inductance tuning apparatus
US2477749A (en) * 1946-04-04 1949-08-02 Aladdin Ind Inc Inductor tuning system
US2528167A (en) * 1948-03-23 1950-10-31 Rca Corp Band-spread tuning inductance device
US2496058A (en) * 1948-05-22 1950-01-31 Rca Corp Permeability tuner
US2621324A (en) * 1948-07-21 1952-12-09 Rca Corp Permeability tuned variable inductance
US2565261A (en) * 1948-09-11 1951-08-21 Rca Corp Permeability tuning system for superheterodyne receiver
US2533810A (en) * 1949-08-13 1950-12-12 Aladdin Ind Inc Wide band calibrated tuner and inductor for use therewith
US2645718A (en) * 1950-06-06 1953-07-14 Rca Corp Variable inductance structure
US2750495A (en) * 1951-11-20 1956-06-12 Motorola Inc Receiver which tunes by adjusting magnetic core antenna
US2979655A (en) * 1957-09-19 1961-04-11 Magnaflux Corp Method and apparatus for detecting flaws
US3017589A (en) * 1958-05-13 1962-01-16 Int Resistance Co Differential transformer
EP0248329A2 (de) * 1986-06-05 1987-12-09 EWD Electronic-Werke Deutschland GmbH Amplitudenspule für die Zeilenendstufe eines Fernsehempfängers
EP0248329A3 (de) * 1986-06-05 1990-03-07 EWD Electronic-Werke Deutschland GmbH Amplitudenspule für die Zeilenendstufe eines Fernsehempfängers

Also Published As

Publication number Publication date
BE450074A (de)
NL99230B (de)
FR894036A (fr) 1944-12-12
GB605807A (en) 1948-07-30
CH231616A (de) 1944-03-31
NL56233C (de)

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