US2468126A - Frequency scanning arrangement - Google Patents

Frequency scanning arrangement Download PDF

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Publication number
US2468126A
US2468126A US604360A US60436045A US2468126A US 2468126 A US2468126 A US 2468126A US 604360 A US604360 A US 604360A US 60436045 A US60436045 A US 60436045A US 2468126 A US2468126 A US 2468126A
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US
United States
Prior art keywords
circuit
tuning
disc
coils
frequency
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 - Lifetime
Application number
US604360A
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English (en)
Inventor
Silver Martin
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to FR955724D priority Critical patent/FR955724A/fr
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US604360A priority patent/US2468126A/en
Application granted granted Critical
Publication of US2468126A publication Critical patent/US2468126A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/32—Automatic scanning over a band of frequencies with simultaneous display of received frequencies, e.g. panoramic receivers

Definitions

  • the present invention relates to radio communication and more particularly to communication apparatus incorporating means for continuously scanning one or more given bands of frequencies both for receiving and transmitting purposes.
  • a further object is to provide a rotatable tuning disc for inductive circuits constructed such as to provide for a variation in the inductive circuit associated therewith in a linear relationship with res-pecttothe rotation thereof.
  • a number of inductive tuning circuits for a receiver or transmitter may be provided in the form of split induction coils wherein a given set of coils may be put into the main circuit for covering a given band of frequencies.
  • a tuning disc comprised of an insulator mem ber which has mounted thereon preferably a metallic foil such as copper shaped to provide a predetermined frequency scanning relationship in respect to the rotation of the disc.
  • the foil is preferably shaped to vary the mutual inductance of the two coil portions, which are in the main circuit, from a given maximum to a given minimum for each rotation of the disc.
  • Fig. l is a schematic diagram of a representative circuit incorporating the frequency scanning means of the invention.
  • Fig. 2 is a schematic representation of a tuning disc and associated circuit tuning coils
  • Fig. 3 is a schematic view in section on the line 3-3 of the tuning arrangement of Fig. 2;
  • Fig. 4 is a graph showing the variation of irequency with time of the signal output of the circuit of Fig. 1.
  • a receiver circuit I is shown in schematic form comprising an antenna circuit 2 which includes an inductance 3 and a ground connection 4.
  • the main receiving circuit 5 of the receiver I is coupled to the antenna inductance 3 by means of a tuned circuit 6 which may be comprised of a plurality of sets of inductive tuning coils l, 8 and 9 and an adjustable condenser l0.
  • Each set of coils 'l, 8 and 9 comprises two halves as at la and lb and may be connected to the main circuit 5 by means of contacts l l and 12.
  • the switching operation of the three sets of coils which cover different and successive frequency band portions may be accomplished by means of a rotatable turret as will be described in detail hereinbelow.
  • the output of the circuit 5 may be utilized in any known manner such as in an audio device (not shown).
  • the disc l3 may comprise an insulating member l3a which may be composed of a suitable plastic or glass and preferably has mounted on one side thereof a foil of copper l6.
  • This foil may take the form as shown in Fig. 2, that is, have a maximum expanse in width at its one end as at ii and gradually taper off toward a zero expanse at its other end 18, the rate of taper being determined by the scanning characteristic desired.
  • each of the coils is provided with contacts 29, which are adapted to cooperate with stationary contacts 2
  • the main circuit is terminated at the two stationary contacts 2
  • the mechanical details of the rotatable turret l9 mounting the three coil sets has not been shown as many suitable arrangements are available. It will suffice to say that a simple device rotatable coaxially of shaft I4 is quite satisfactory. As a given set of coil portions isrotated into contact with the main circuit, the inductance of each respective coil is determined by the sum of the inductances of the two coil halves and twice the mutual inductance between the two coil portions.
  • the factor of the total inductance depending on the mutual inductance of the two coil portions is varied in accordance with the width of the foil present in the gap at any one time.
  • the foil in efiect acts as a shield between the coil portions whereby the mutual inductance is more or less reduced as the width of the foil is varied in the gap.
  • the continuous variation in the expanse of the foil between the two coil portions results in a variation of the mutual inductance factor from a maximum to a minimum and consequently in a variation of the tuned resonance frequency of the circuit with time in accordance, for instance, with the saw-tooth variation shown in Fig. 4.
  • Other relationships between frequency and time may, of course, be obtained by a suitable radial variation in the width of the foil.
  • a tunable circuit which may cover one or more sections of a given frequency band and the individual sections of which may be continuously scanned in respect to time.
  • Frequency scanning means for use with the frequency tuning inductance of a tunable circuit comprising a rotatable non-conductive disc having a conductive portion including a copper foil arranged about the periphery of said disc and tapering in width from a maximum to a minimum.
  • a tunable circuit having connecting means, turret means mounting a plurality of circuit tuning inductances, each of said inductances having means for engaging said connecting means, said tunin inductances each comprising two halves, said turret being rotatable for selectively placing said respective inductances in connection with said circuit, and means for cyclically varying the inductance respectively connected to said circuit, said varying means comprising an electro-conductive member having a varying width rotatably disposed intermediate said two halves.
  • said varying means comprises a rotatable nonconductive disc having a conductive portion including a metallic foil arranged about the periphery of said disc and tapering in width from a maximum to a minimum.

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  • Magnetic Resonance Imaging Apparatus (AREA)
US604360A 1945-07-11 1945-07-11 Frequency scanning arrangement Expired - Lifetime US2468126A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR955724D FR955724A (enrdf_load_stackoverflow) 1945-07-11
US604360A US2468126A (en) 1945-07-11 1945-07-11 Frequency scanning arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US604360A US2468126A (en) 1945-07-11 1945-07-11 Frequency scanning arrangement

Publications (1)

Publication Number Publication Date
US2468126A true US2468126A (en) 1949-04-26

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ID=24419289

Family Applications (1)

Application Number Title Priority Date Filing Date
US604360A Expired - Lifetime US2468126A (en) 1945-07-11 1945-07-11 Frequency scanning arrangement

Country Status (2)

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US (1) US2468126A (enrdf_load_stackoverflow)
FR (1) FR955724A (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644141A (en) * 1950-11-24 1953-06-30 Lytle Engineering & Mfg Co Tuner for radio receivers and the like
US2773986A (en) * 1952-12-12 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2773988A (en) * 1952-11-26 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2807724A (en) * 1952-10-15 1957-09-24 Du Mont Allen B Lab Inc Electrical tuning device
US2808514A (en) * 1952-10-10 1957-10-01 Du Mont Allen B Lab Inc Tuning element for electrical tuning apparatus
US2825812A (en) * 1952-10-15 1958-03-04 Du Mont Allen B Lab Inc Operating means for electrical tuning devices
US2950386A (en) * 1954-06-10 1960-08-23 Polarad Electronics Corp Linearly responsive voltage generating means with variable induction coupling
US3066270A (en) * 1960-01-22 1962-11-27 Standard Coil Prod Co Inc Turret tuner with flat spiral coils
US3090933A (en) * 1957-11-13 1963-05-21 Printed Motors Inc A. c. transducers and variometers
US3219956A (en) * 1961-09-22 1965-11-23 Sperry Rand Corp Ford Instr Co Brushless rotary inductive devices
WO1986004731A1 (en) * 1985-02-11 1986-08-14 Fiori David Inductance coil sensor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432455A (en) * 1919-07-28 1922-10-17 Rca Corp Method and apparatus for receiving sustained wave signals
GB202115A (en) * 1922-06-20 1923-08-16 Andrew Humphry Salwey Maccallu Improvements in or relating to electrical apparatus for use in high frequency circuits
FR586036A (fr) * 1924-09-18 1925-03-13 Procédé et dispositif permettant de changer instantanément les bobines de self dans un montage de réception de télégraphie sans fil
US1571405A (en) * 1919-07-31 1926-02-02 Rca Corp Apparatus for wave changing in radiosignaling
US1983380A (en) * 1933-07-27 1934-12-04 Gen Electric High frequency amplifier
US2137392A (en) * 1934-02-16 1938-11-22 Rca Corp Variable inductor
US2141613A (en) * 1930-02-13 1938-12-27 Melicharek John Coil selector

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1432455A (en) * 1919-07-28 1922-10-17 Rca Corp Method and apparatus for receiving sustained wave signals
US1571405A (en) * 1919-07-31 1926-02-02 Rca Corp Apparatus for wave changing in radiosignaling
GB202115A (en) * 1922-06-20 1923-08-16 Andrew Humphry Salwey Maccallu Improvements in or relating to electrical apparatus for use in high frequency circuits
FR586036A (fr) * 1924-09-18 1925-03-13 Procédé et dispositif permettant de changer instantanément les bobines de self dans un montage de réception de télégraphie sans fil
US2141613A (en) * 1930-02-13 1938-12-27 Melicharek John Coil selector
US1983380A (en) * 1933-07-27 1934-12-04 Gen Electric High frequency amplifier
US2137392A (en) * 1934-02-16 1938-11-22 Rca Corp Variable inductor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2644141A (en) * 1950-11-24 1953-06-30 Lytle Engineering & Mfg Co Tuner for radio receivers and the like
US2808514A (en) * 1952-10-10 1957-10-01 Du Mont Allen B Lab Inc Tuning element for electrical tuning apparatus
US2807724A (en) * 1952-10-15 1957-09-24 Du Mont Allen B Lab Inc Electrical tuning device
US2825812A (en) * 1952-10-15 1958-03-04 Du Mont Allen B Lab Inc Operating means for electrical tuning devices
US2773988A (en) * 1952-11-26 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2773986A (en) * 1952-12-12 1956-12-11 Standard Coil Prod Co Inc Frequency selector
US2950386A (en) * 1954-06-10 1960-08-23 Polarad Electronics Corp Linearly responsive voltage generating means with variable induction coupling
US3090933A (en) * 1957-11-13 1963-05-21 Printed Motors Inc A. c. transducers and variometers
US3066270A (en) * 1960-01-22 1962-11-27 Standard Coil Prod Co Inc Turret tuner with flat spiral coils
US3219956A (en) * 1961-09-22 1965-11-23 Sperry Rand Corp Ford Instr Co Brushless rotary inductive devices
WO1986004731A1 (en) * 1985-02-11 1986-08-14 Fiori David Inductance coil sensor
US4777436A (en) * 1985-02-11 1988-10-11 Sensor Technologies, Inc. Inductance coil sensor

Also Published As

Publication number Publication date
FR955724A (enrdf_load_stackoverflow) 1950-01-19

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