US2252100A - Short-wave radio receiver with band-spreading - Google Patents

Short-wave radio receiver with band-spreading Download PDF

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Publication number
US2252100A
US2252100A US334113A US33411340A US2252100A US 2252100 A US2252100 A US 2252100A US 334113 A US334113 A US 334113A US 33411340 A US33411340 A US 33411340A US 2252100 A US2252100 A US 2252100A
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United States
Prior art keywords
band
short
spreading
inductance
variable
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Expired - Lifetime
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US334113A
Inventor
Spoor Thcodorus Antonius
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RCA Corp
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RCA Corp
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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
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading

Definitions

  • the present invention relates to a radio receiver according to the above mentioned application having more than one short-wave range.
  • the case may occur that the bands to be spread are divided over more than one short-Wave range.
  • the tuning means for band-spreading operate in this case on more than one short-wave range.
  • the tun ing means for band-spreading are constituted, for example, by small variable inductance coils connected in series with the fixed inductance coils of the oscillatory circuits to be tuned. By means of these coils the total inductance of the oscillatory circuits can be varied by a certain percent.
  • the inductance of the fixed inductance coil When changing over to another short-wave range the inductance of the fixed inductance coil is varied.
  • the transmitters are situated closely to one another on the tuning scale which remains for the greater part unused.
  • this drawback is obviated by switching-over the tuning means for band-spreading when changing over from one short-wave range to another.
  • the switch by which the tuning means for bandspreading are changed over is mechanically coupled to the switch for wave-length changing.
  • the drawing shows an oscillatory circuit l which can be tuned in two short-wave ranges and is also adapted for band-spread reception in each of these short-wave ranges.
  • the oscillatory circuit is constituted by a variable tuning condenser 2, a fixed inductance coil 3 and a variable inductance coil 4 serving for band-spreading. Between the coils 3 and 4 are connected two series-connected switches 5 and 6 which are mechanically coupled. The mechanical coupling is diagrammatically shown by the link I.
  • the coil 3 is switched out of circuit and a smaller coil 8 is connected in series with part of the variable inductance coil 4.
  • the coil 4 is provided with a tapping 9 whichmay be brought into connection with a contact of the switch 6.
  • the tapping 9 is so chosen that the percentage variation of the total inductance of the oscillatory circuit 1 obtained with the coil 4 is approximately the sam in either position of the switch.
  • the switches 5 and 6 may constitute part of the switch for Wave-length changing which already exists in the receiver for switching over to the intermediate and long-wave range.
  • a tunable circuit for a multi-band receiver comprising a variable condenser, series-connect-ed fixed and variable inductances shunted across the variable condenser, a second fixed inductance, and means for replacing the first fixed inductance by the second and simultaneously including in circuit only a portion of the variable inductance.
  • a multi-band radio receiver of the type utilizing in conjunction with a variable condenser one of a plurality of fixed inductance coils of difierent values which determine the band of frequencies to be received, means for selecting one of the fixed inductance coils to cooperate with the variable condenser, a variable inductance coil included in circuit with one of the fixed inductance coils and the variable condenser for effecting band spreading, the selecting means being constructed and arranged to include only a portion of said variable inductance coil upon operation of the selecting means to include another fixed inductance coil.
  • a circuit comprising a fixed inductance, a variable inductance and a variable capacity adapted to be tuned through a comparatively wide range of frequencies, the variable capacity serving to tune said circuit roughly to a plurality of comparatively narrow frequency bands within said Wide range of frequencies, the variable inductance serving as a fine adjustment tuning means for frequencies within the narrow frequency bands, a second fixed inductance and means for substituting the latter for the first mentioned fixed inductance 5 circuit only a portion of the variable inductance.

Description

Aug. 12, 1941. T. A, sPooR 4 v 0 SHORI WAVE RADIO RECEIVER WITH BAND-SPREADING Fil ed May 9, 1940 70 BAA/D 51 7/7677 INVENTOR 7' l-IEODORUS A POOR ATTORNEY Patented Aug. 12, 1941 SHORT-WAVE RADIO RECEIVER WITH BAND-SPREADING Theodorus Antonius Spoor, Eindhoven, Netherlands, assignor to ltadio Corporation of America, New York, N. Y.
Application May 9, 1940, Serial No. 334,113 In Germany June 28, 1939 4 main-ls.
In the copending application of A. T. Vossen, Serial No. 297,972, filed October 5, 1939 there is described a device for obtaining band-spreading in short-wave reception.
The present invention relates to a radio receiver according to the above mentioned application having more than one short-wave range.
In such a receiver the case may occur that the bands to be spread are divided over more than one short-Wave range.
In band-spread reception the tuning means for band-spreading operate in this case on more than one short-wave range.
According to the earlier application the tun ing means for band-spreading are constituted, for example, by small variable inductance coils connected in series with the fixed inductance coils of the oscillatory circuits to be tuned. By means of these coils the total inductance of the oscillatory circuits can be varied by a certain percent.
When changing over to another short-wave range the inductance of the fixed inductance coil is varied. This entails the disadvantage that if the ratio of the inductances of the fixed and the variable inductance coils on the shortwave rang with the largest wavelength is correct, this relation, when changing over to another wavelength range, is too great to obtain a proper band-spreading on the bands situated in this short-wave range. In this case the transmitters are situated closely to one another on the tuning scale which remains for the greater part unused.
According to th invention this drawback is obviated by switching-over the tuning means for band-spreading when changing over from one short-wave range to another. Preferably, the switch by which the tuning means for bandspreading are changed over is mechanically coupled to the switch for wave-length changing.
The invention will be more clearly understood by reference to the accompanying drawing showing, by way of example, one embodiment thereof.
The drawing shows an oscillatory circuit l which can be tuned in two short-wave ranges and is also adapted for band-spread reception in each of these short-wave ranges.
In the position shown the oscillatory circuit is constituted by a variable tuning condenser 2, a fixed inductance coil 3 and a variable inductance coil 4 serving for band-spreading. Between the coils 3 and 4 are connected two series-connected switches 5 and 6 which are mechanically coupled. The mechanical coupling is diagrammatically shown by the link I.
When the two switches 5 and 6 are changed over, the coil 3 is switched out of circuit and a smaller coil 8 is connected in series with part of the variable inductance coil 4. For this purpose the coil 4 is provided with a tapping 9 whichmay be brought into connection with a contact of the switch 6.
The tapping 9 is so chosen that the percentage variation of the total inductance of the oscillatory circuit 1 obtained with the coil 4 is approximately the sam in either position of the switch.
The switches 5 and 6 may constitute part of the switch for Wave-length changing which already exists in the receiver for switching over to the intermediate and long-wave range.
What I claim is:
1. A tunable circuit for a multi-band receiver comprising a variable condenser, series-connect-ed fixed and variable inductances shunted across the variable condenser, a second fixed inductance, and means for replacing the first fixed inductance by the second and simultaneously including in circuit only a portion of the variable inductance.
2. A tunable circuit in accordance with the invention defined in claim 1 wherein the fixed and variable inductances are chosen of such values that the percentage of detuning by the variable inductance of the tunable circuit utiliz ing the first fixed inductance is at least approximately the same as the percentage of detuning by the included portion of the Variable inductance of the tunable circuit utilizing the second fixed inductance.
3. A multi-band radio receiver of the type utilizing in conjunction with a variable condenser one of a plurality of fixed inductance coils of difierent values which determine the band of frequencies to be received, means for selecting one of the fixed inductance coils to cooperate with the variable condenser, a variable inductance coil included in circuit with one of the fixed inductance coils and the variable condenser for effecting band spreading, the selecting means being constructed and arranged to include only a portion of said variable inductance coil upon operation of the selecting means to include another fixed inductance coil.
4. In a radio receiver, a circuit comprising a fixed inductance, a variable inductance and a variable capacity adapted to be tuned through a comparatively wide range of frequencies, the variable capacity serving to tune said circuit roughly to a plurality of comparatively narrow frequency bands within said Wide range of frequencies, the variable inductance serving as a fine adjustment tuning means for frequencies within the narrow frequency bands, a second fixed inductance and means for substituting the latter for the first mentioned fixed inductance 5 circuit only a portion of the variable inductance.
THEODORUS ANTONIUS SPOOR.
US334113A 1938-10-13 1940-05-09 Short-wave radio receiver with band-spreading Expired - Lifetime US2252100A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE536412X 1938-10-13
DE2285029X 1939-06-22
DE2252100X 1939-06-28

Publications (1)

Publication Number Publication Date
US2252100A true US2252100A (en) 1941-08-12

Family

ID=32096473

Family Applications (2)

Application Number Title Priority Date Filing Date
US334113A Expired - Lifetime US2252100A (en) 1938-10-13 1940-05-09 Short-wave radio receiver with band-spreading
US334499A Expired - Lifetime US2285029A (en) 1938-10-13 1940-05-11 Band-spread tuning mechanism

Family Applications After (1)

Application Number Title Priority Date Filing Date
US334499A Expired - Lifetime US2285029A (en) 1938-10-13 1940-05-11 Band-spread tuning mechanism

Country Status (6)

Country Link
US (2) US2252100A (en)
BE (1) BE440362A (en)
DE (1) DE1081072B (en)
FR (3) FR860823A (en)
GB (1) GB536412A (en)
NL (1) NL64971C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424506A (en) * 1942-10-24 1947-07-22 Rca Corp Permeability-tuned short-wave spread-band receiver
US2434299A (en) * 1940-08-28 1948-01-13 Hartford Nat Bank & Trust Co Radio receiver with band-spread control for a number of comparatively narrow frequency bands
US2486692A (en) * 1941-07-01 1949-11-01 Hartford Nat Bank & Trust Co Device for the band-spread tuning of radio apparatus
US5300904A (en) * 1990-04-17 1994-04-05 Topholm & Westermann Aps Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE761144C (en) * 1941-01-27 1952-11-10 Telefunken Gmbh Receiver with spread spectrum in the shortwave range
DE976578C (en) * 1941-04-11 1963-12-05 Siemens Ag Variometer arrangement with different variation ranges
DE952184C (en) * 1942-03-14 1956-11-15 Lorenz C Ag Receiver with permeability adjustment by moving iron cores for band spreading
DE963884C (en) * 1949-03-04 1957-05-16 Siemens Ag Circuit for frequency adjustment
DE933346C (en) * 1950-10-21 1955-09-22 Siemens Ag Variometer with movable iron core, especially for shortwave band spreading in radio equipment
DE864894C (en) * 1951-03-15 1953-01-29 Saba Gmbh Device for fine tuning of high-frequency oscillation circuits, preferably for radio equipment
DE902265C (en) * 1951-11-20 1954-01-21 Oskar Vierling Dr Voting arrangement and construction of small receivers
US5302415A (en) * 1992-12-08 1994-04-12 E. I. Du Pont De Nemours And Company Electroless plated aramid surfaces and a process for making such surfaces

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434299A (en) * 1940-08-28 1948-01-13 Hartford Nat Bank & Trust Co Radio receiver with band-spread control for a number of comparatively narrow frequency bands
US2486692A (en) * 1941-07-01 1949-11-01 Hartford Nat Bank & Trust Co Device for the band-spread tuning of radio apparatus
US2424506A (en) * 1942-10-24 1947-07-22 Rca Corp Permeability-tuned short-wave spread-band receiver
US5300904A (en) * 1990-04-17 1994-04-05 Topholm & Westermann Aps Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying

Also Published As

Publication number Publication date
FR51420E (en) 1942-06-24
NL64971C (en)
US2285029A (en) 1942-06-02
FR860823A (en) 1941-01-24
GB536412A (en) 1941-05-14
FR51427E (en) 1942-06-24
BE440362A (en)
DE1081072B (en) 1960-05-05

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