US2434299A - Radio receiver with band-spread control for a number of comparatively narrow frequency bands - Google Patents

Radio receiver with band-spread control for a number of comparatively narrow frequency bands Download PDF

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Publication number
US2434299A
US2434299A US480186A US48018643A US2434299A US 2434299 A US2434299 A US 2434299A US 480186 A US480186 A US 480186A US 48018643 A US48018643 A US 48018643A US 2434299 A US2434299 A US 2434299A
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United States
Prior art keywords
band
condensers
circuit
tuning
frequency bands
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Expired - Lifetime
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US480186A
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English (en)
Inventor
Carel Jan Van Loon
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/32—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using magnetic devices with controllable degree of saturation

Definitions

  • the said fixed condensers In order to ensure.- well reproducible tuning in the diiferent narrow short-wave bands the said fixed condensers, and more particularly the fixed condensers to beconnccired in serieswith the variable condenser, must be of excellent quality, so that solely condensers of prime quality can beused for this purpose which, howevenare comparatively expensive.
  • T present invention has for its obiecttoeliminate at least. partly this drawback- According to the invention the same seriesand parallel-capacity is used for tuning in the various comparatively narrowshort wave :bands :and chan in .over from one comparatively narrow short-wave band to another is efiected by varying the inductance of the resonant circuit.
  • Variation of the inductance is preferably effected by connecting one or more inductances in parallel with the inductance used for continuous tuning in the broad short-wave range.
  • the reference number I denotes a mixing tube to which are connected a preselection circuit 2 and an oscillator circuit 3.
  • the anode-circuit of the mixing tube I is connected through a band-pass-filter 4, which is tuned to the intermediate frequency, to the intermediatefrequency amplifier, detector and low-frequency amplifier of the receiver which are schematically represented by 5.
  • Each of the circuits 2, 3 comprises a tuning condenser I0, respectively and a coil ll, 2
  • the tuningcondenser is connected directly in parallel with the corresponding coil in each of the circuitaas shown in the drawing.
  • the desired narrow short-wave band is chosen by connecting one of'the coils l6, l1, l8 and 26,, 27!, 28, respectively in parallel with the coil H and 2
  • the circuit according to the invention exhibits material advantages over the known circuit referred to above, in which changing over from one narrow short-wave band to another is efiected by replacement of the condensers connected in series and in parallel with each tuning condenser.
  • the back-coupling coil 1 can be coupled with the coil 2
  • the oscillator circuit 3 may be changed over, in the manner shown in the drawing, for tuning with band-spreading, more particularly when the receiver comprises a plurality of pre-selection circuits, the pro-selection circuit 2 or one of the pre-selection circuits being tuned in a manner known per se, for instance by means of a fixed condenser, to the average frequency of the narrow short-wave band to be received.
  • the invention may also be used with advantage in receiving sets adapted to be'tuned in a continuous manner in a plurality of broad short-wave ranges.
  • a saving in regard to the required inductances for band-spreading can still be obtained, by effecting the modification of the inductance in band-spreading in one broad short-wave range, by connecting together with the inductance used for continuous tuning in another broad short-wave range one or more other coils in series.
  • a tunable circuit comprising a main inductance and a shunt variable condenser for tuning the circuit over a wide band of frequencies, and means for converting said circuit to one that is tunable by said variable condenser over a comparatively narrow frequency band, said means comprising a pair of condensers connected respectively in series and in shunt with said variable condenser and an inductance in shunt to the main inductance 2.
  • a tunable circuit comprising a main inductance and a shunt variable condenser which is varied through its range to tune the circuit-over a wide band of frequencies, and means for effecting band-spread tuning of said circuit in a comparatively narrow frequency band utilizing the full range of said variable condenser, said means comprising a pair of condensers connected respectively in series and in shunt with said variable condenser and an inductance in shunt to the main inductance.
  • a tunable circuit comprising a main inductance and a shunt variable condenser which is varied through its range to tune the circuit over a wide band of frequencies, and means for effecting band-spread tuning of said circuit in a plurality of comparatively narrow frequency bands utilizing in each case substantially the full range of said variable condenser, said means comprising a pair of condensers connected respectively in series and in shunt with said variable condenser, said series and shunt condensers being effective during the reception of each of said plurality of 'narrow'frequency bands, and a plurality of invariable condenser, said condensers being unicontrolled and adapted upon variation through their range to tune the receiver over a wide band of frequencies, and means for effecting bandspread tuning of the receiver in a plurality of comparatively narrow frequency bands utilizing in each case substantially the full range of said variable condensers, said means comprising a pair of condensers connected respectively in series and in shunt with each of said variable conden

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
US480186A 1940-08-28 1943-03-23 Radio receiver with band-spread control for a number of comparatively narrow frequency bands Expired - Lifetime US2434299A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL220606X 1940-08-28

Publications (1)

Publication Number Publication Date
US2434299A true US2434299A (en) 1948-01-13

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ID=19779330

Family Applications (1)

Application Number Title Priority Date Filing Date
US480186A Expired - Lifetime US2434299A (en) 1940-08-28 1943-03-23 Radio receiver with band-spread control for a number of comparatively narrow frequency bands

Country Status (4)

Country Link
US (1) US2434299A (fr)
BE (2) BE551064A (fr)
CH (1) CH220606A (fr)
FR (1) FR876331A (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470426A (en) * 1942-10-28 1949-05-17 Zenith Radio Corp Spread band tuning circuit
US2483183A (en) * 1947-06-25 1949-09-27 Avco Mfg Corp Oscillator circuits
US2525053A (en) * 1945-08-01 1950-10-10 Rca Corp Multirange oscillator circuits
US2586576A (en) * 1947-06-14 1952-02-19 Hartford Nat Bank & Trust Co Wireless receiver tunable to a number of wave length ranges
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning
US2597142A (en) * 1945-12-20 1952-05-20 Cossor Ltd A C Radio receiver circuits
US2650298A (en) * 1951-03-29 1953-08-25 Standard Coil Prod Co Inc Television booster circuits
US2816221A (en) * 1952-10-10 1957-12-10 Philips Corp Band and channel switching receiver with capacitor connectible either for main or vernier tuning
US3389346A (en) * 1964-07-20 1968-06-18 James E. Webb Compensating bandwidth switching transients in an amplifier circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE973181C (de) * 1944-06-27 1959-12-17 Georg Von Dipl-Ing Schaub Abstimmanordnung fuer kurze Wellen
DE947376C (de) * 1952-03-07 1956-08-16 Blaupunkt Werke G M B H Zweign Kombinierter Fernseh- und UKW-Rundfunkempfaenger mit induktiver Abstimmung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658718A (en) * 1925-11-05 1928-02-07 Hardcastle Harry Tuned circuits of wireless apparatus
US2061416A (en) * 1935-07-16 1936-11-17 Albert F Blume Radio system
US2062379A (en) * 1934-11-30 1936-12-01 Glen S Patents And Holdings In Radio receiver
US2129026A (en) * 1933-03-09 1938-09-06 Rca Corp Tuning range adjustment device
US2137318A (en) * 1931-05-28 1938-11-22 Hazeltine Corp Multiband tunable system
US2252100A (en) * 1938-10-13 1941-08-12 Rca Corp Short-wave radio receiver with band-spreading
US2309014A (en) * 1941-08-29 1943-01-19 Gen Electric Multiband tuning system
GB551064A (en) * 1941-12-18 1943-02-05 Philips Nv Improvements in or relating to radio receivers

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658718A (en) * 1925-11-05 1928-02-07 Hardcastle Harry Tuned circuits of wireless apparatus
US2137318A (en) * 1931-05-28 1938-11-22 Hazeltine Corp Multiband tunable system
US2129026A (en) * 1933-03-09 1938-09-06 Rca Corp Tuning range adjustment device
US2062379A (en) * 1934-11-30 1936-12-01 Glen S Patents And Holdings In Radio receiver
US2061416A (en) * 1935-07-16 1936-11-17 Albert F Blume Radio system
US2252100A (en) * 1938-10-13 1941-08-12 Rca Corp Short-wave radio receiver with band-spreading
US2309014A (en) * 1941-08-29 1943-01-19 Gen Electric Multiband tuning system
GB551064A (en) * 1941-12-18 1943-02-05 Philips Nv Improvements in or relating to radio receivers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2470426A (en) * 1942-10-28 1949-05-17 Zenith Radio Corp Spread band tuning circuit
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning
US2525053A (en) * 1945-08-01 1950-10-10 Rca Corp Multirange oscillator circuits
US2597142A (en) * 1945-12-20 1952-05-20 Cossor Ltd A C Radio receiver circuits
US2586576A (en) * 1947-06-14 1952-02-19 Hartford Nat Bank & Trust Co Wireless receiver tunable to a number of wave length ranges
US2483183A (en) * 1947-06-25 1949-09-27 Avco Mfg Corp Oscillator circuits
US2650298A (en) * 1951-03-29 1953-08-25 Standard Coil Prod Co Inc Television booster circuits
US2816221A (en) * 1952-10-10 1957-12-10 Philips Corp Band and channel switching receiver with capacitor connectible either for main or vernier tuning
US3389346A (en) * 1964-07-20 1968-06-18 James E. Webb Compensating bandwidth switching transients in an amplifier circuit

Also Published As

Publication number Publication date
FR876331A (fr) 1942-11-03
BE551064A (fr)
CH220606A (de) 1942-04-15
BE442583A (fr)

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