GB876002A - Improvements in and relating to automatic frequency control systems for oscillators - Google Patents

Improvements in and relating to automatic frequency control systems for oscillators

Info

Publication number
GB876002A
GB876002A GB4015458A GB4015458A GB876002A GB 876002 A GB876002 A GB 876002A GB 4015458 A GB4015458 A GB 4015458A GB 4015458 A GB4015458 A GB 4015458A GB 876002 A GB876002 A GB 876002A
Authority
GB
United Kingdom
Prior art keywords
oscillator
valve
frequency
diode
automatic 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
Application number
GB4015458A
Inventor
Joseph Benjamin Gurney
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.)
LEE PRODUCTS GREAT BRITAIN Ltd
Original Assignee
LEE PRODUCTS GREAT BRITAIN Ltd
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 LEE PRODUCTS GREAT BRITAIN Ltd filed Critical LEE PRODUCTS GREAT BRITAIN Ltd
Priority to GB4015458A priority Critical patent/GB876002A/en
Publication of GB876002A publication Critical patent/GB876002A/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
    • 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

Abstract

876,002. Automatic frequency control. LEE PRODUCTS (GREAT BRITAIN) Ltd. Dec. 3, 1959 [Dec. 12, 1958], No. 40154/58. Class 40(5) The frequency of the local oscillator of a television or radio f.m. receiver is automatically controlled by the provision of a diode associated with the resonant circuit of the oscillator, variations in a control signal derived preferably from a ratio detector or phase discriminator causing corresponding variations in the diode reactance and therefore of the oscillator frequency. In the Figure accompanying the Provisional Specification the control signal is fed in through an amplifier valve V 1 and applied to a semi-conductor diode D via a potentiometer network R 4 , R 5 , L 1 C 5 being the resonant circuit of the local oscillator LO. In another embodiment (Fig. 1, not shown) the valve acts also as an audio frequency voltage amplifier while in yet another embodiment (Fig. 2, not shown) the valve is connected as a cathode follower. Reference has been directed by the Comptroller to Specification 810,311.
GB4015458A 1958-12-12 1958-12-12 Improvements in and relating to automatic frequency control systems for oscillators Expired GB876002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4015458A GB876002A (en) 1958-12-12 1958-12-12 Improvements in and relating to automatic frequency control systems for oscillators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4015458A GB876002A (en) 1958-12-12 1958-12-12 Improvements in and relating to automatic frequency control systems for oscillators

Publications (1)

Publication Number Publication Date
GB876002A true GB876002A (en) 1961-08-30

Family

ID=10413452

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4015458A Expired GB876002A (en) 1958-12-12 1958-12-12 Improvements in and relating to automatic frequency control systems for oscillators

Country Status (1)

Country Link
GB (1) GB876002A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177700B (en) * 1962-09-08 1964-09-10 Graetz Kommanditgesellschaft Circuit arrangement for the automatic sharpening of an oscillator
US3293571A (en) * 1963-12-06 1966-12-20 Rca Corp Variable reactance solid state frequency modulation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1177700B (en) * 1962-09-08 1964-09-10 Graetz Kommanditgesellschaft Circuit arrangement for the automatic sharpening of an oscillator
US3293571A (en) * 1963-12-06 1966-12-20 Rca Corp Variable reactance solid state frequency modulation system

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