GB901426A - Automatic frequency control circuits - Google Patents

Automatic frequency control circuits

Info

Publication number
GB901426A
GB901426A GB261960A GB261960A GB901426A GB 901426 A GB901426 A GB 901426A GB 261960 A GB261960 A GB 261960A GB 261960 A GB261960 A GB 261960A GB 901426 A GB901426 A GB 901426A
Authority
GB
United Kingdom
Prior art keywords
local oscillator
receiver
voltage
point contact
amplified
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
GB261960A
Inventor
Eric Geoffrey Chardin
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.)
Pye Electronic Products Ltd
Original Assignee
Pye 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 Pye Ltd filed Critical Pye Ltd
Priority to GB261960A priority Critical patent/GB901426A/en
Publication of GB901426A publication Critical patent/GB901426A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

901,426. Automatic frequency-control systems. PYE Ltd. Jan. 13, 1961 [Jan. 25, 1960], No. 2619/60. Drawings to Specification. Class 40 (5). A.F.C. voltage applied to a semi-conductor point contact voltage variable capacitor connected to a receiver local oscillator is amplified over a pre-detector signal amplifier stage of the receiver. The latter may be a grounded grid R.F. stage of an F.M. receiver, preceding a selfoscillating mixer. Alternatively the local oscillator and point contact capacitor may be part of a television receiver turret tuner unit, and a ratio discriminator for detecting an accompanying F.M. sound channel may produce the A.F.C. voltage which is then amplified over a sound I.F. amplifier before being connected over a single lead to the point contact capacitor. Alternatively an amplified A.F.C. voltage may be applied to each of two semi-conductor capacitors, connected to a local oscillator for a television channel and a local oscillator for an F.M. sound channel respectively.
GB261960A 1960-01-25 1960-01-25 Automatic frequency control circuits Expired GB901426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB261960A GB901426A (en) 1960-01-25 1960-01-25 Automatic frequency control circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB261960A GB901426A (en) 1960-01-25 1960-01-25 Automatic frequency control circuits

Publications (1)

Publication Number Publication Date
GB901426A true GB901426A (en) 1962-07-18

Family

ID=9742752

Family Applications (1)

Application Number Title Priority Date Filing Date
GB261960A Expired GB901426A (en) 1960-01-25 1960-01-25 Automatic frequency control circuits

Country Status (1)

Country Link
GB (1) GB901426A (en)

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