GB951078A - A variable frequency tuning device - Google Patents

A variable frequency tuning device

Info

Publication number
GB951078A
GB951078A GB3071461A GB3071461A GB951078A GB 951078 A GB951078 A GB 951078A GB 3071461 A GB3071461 A GB 3071461A GB 3071461 A GB3071461 A GB 3071461A GB 951078 A GB951078 A GB 951078A
Authority
GB
United Kingdom
Prior art keywords
inductor
inductance
battery
capacity
increase
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
GB3071461A
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Publication of GB951078A publication Critical patent/GB951078A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/22—Angle modulation by means of variable impedance by means of a variable reactive element the element being a semiconductor diode, e.g. varicap diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

951,078. Saturable reactors. SONY CORPORATION. Aug. 25, 1961 [Sept. 12, 1960 (2)], No. 30714/61. Heading H3B. A circuit with variable tuning comprises either a series or a parallel arrangement of a semi-conductor diode 7 and a saturable inductor 5. The two reactors are linked to a control, shown as a battery 8, so that the inductance L, Fig. 3, drops as the control current I increases and the capacity C, Fig. 2, drops as the control voltage E increases. In Fig. 1, inductor 5 and diode 7 are series connected to terminals 11, 14. The battery 8 drives a current through winding 4 on core 3 of inductor 5. The inductor may be biased with a permanent magnet 6. In a modification, Fig. 4, the inductor 5 is biased by the permanent magnet 6 and the effect of control voltage EL and winding 4 is to counteract the bias and increase the inductance. As the potentiometer contact 20 moves to the right, the inductance and the capacity of the circuit increase together to lower the tuned frequency. A change in the voltage of battery 8 tends to decrease the capacity and to increase inductance or vice-versa leaving the tuned frequency substantially unchanged.
GB3071461A 1960-09-12 1961-08-25 A variable frequency tuning device Expired GB951078A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3821560 1960-09-12
JP3821660 1960-09-12

Publications (1)

Publication Number Publication Date
GB951078A true GB951078A (en) 1964-03-04

Family

ID=26377408

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3071461A Expired GB951078A (en) 1960-09-12 1961-08-25 A variable frequency tuning device

Country Status (1)

Country Link
GB (1) GB951078A (en)

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