GB979653A - Improvements relating to automatic tuning arrangements - Google Patents

Improvements relating to automatic tuning arrangements

Info

Publication number
GB979653A
GB979653A GB2595863A GB2595863A GB979653A GB 979653 A GB979653 A GB 979653A GB 2595863 A GB2595863 A GB 2595863A GB 2595863 A GB2595863 A GB 2595863A GB 979653 A GB979653 A GB 979653A
Authority
GB
United Kingdom
Prior art keywords
voltage
diode
afc
capacity
improvements relating
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
GB2595863A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB979653A publication Critical patent/GB979653A/en
Expired legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes
    • H03J7/10—Modification of automatic frequency control sensitivity or linearising automatic frequency control operation

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Television Receiver Circuits (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

979,653. Automatic frequency control systems. TELEFUNKEN PATENTVERWERTUNGSGESELLSCHAFT. July 1, 1963 [June 29, 1962], No. 25958/63. Drawings to Specification. Heading H3A. A television receiver self-oscillating mixer is frequency controlled by a capacity diode in the oscillator tuned circuit and the AFC output from a frequency discriminator is non-linearly amplified before applying it to the diode so that the diode's capacity variations are more linearly related to the AFC voltage. To this end the AFC voltage is applied to the grid of a back-biased cathode follower of low anode voltage operating at the bottom part of its anode current/control voltage characteristic to produce a correspondingly much greater output for one polarity of the AFC voltage than for the other, and compensating the converse capacity variations of the diode with voltage.
GB2595863A 1962-06-29 1963-07-01 Improvements relating to automatic tuning arrangements Expired GB979653A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET22387A DE1153097B (en) 1962-06-29 1962-06-29 Device for automatic sharp tuning by means of a capacitance diode

Publications (1)

Publication Number Publication Date
GB979653A true GB979653A (en) 1965-01-06

Family

ID=7550518

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2595863A Expired GB979653A (en) 1962-06-29 1963-07-01 Improvements relating to automatic tuning arrangements

Country Status (2)

Country Link
DE (1) DE1153097B (en)
GB (1) GB979653A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697885A (en) * 1970-12-04 1972-10-10 Rca Corp Automatic frequency control circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697885A (en) * 1970-12-04 1972-10-10 Rca Corp Automatic frequency control circuits

Also Published As

Publication number Publication date
DE1153097B (en) 1963-08-22

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