GB797084A - Automatic frequency control system for frequency modulation receivers - Google Patents

Automatic frequency control system for frequency modulation receivers

Info

Publication number
GB797084A
GB797084A GB1293455A GB1293455A GB797084A GB 797084 A GB797084 A GB 797084A GB 1293455 A GB1293455 A GB 1293455A GB 1293455 A GB1293455 A GB 1293455A GB 797084 A GB797084 A GB 797084A
Authority
GB
United Kingdom
Prior art keywords
frequency
local oscillator
output
control system
automatic
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
GB1293455A
Inventor
James Douglas Jones
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 GB1293455A priority Critical patent/GB797084A/en
Priority to FR1148196D priority patent/FR1148196A/en
Publication of GB797084A publication Critical patent/GB797084A/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

Landscapes

  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

797,084. Automatic frequency control systems. PYE, Ltd. April- 26, 1956 [May 4, 1955], No. 12934/55. Drawings to Specification. Class 38 (4). In a frequency-modulation receiver the amplified discriminator output from an audiofrequency amplifier stage also provides an amplified D.C. output measuring frequency drift of a local oscillator or of the mean frequency of an incoming signal and is applied to a barium titanate or other voltage variable capacitor in a local oscillator or other tuned circuit to correct or compensate the frequency drift. The D.C. output may be applied through a high resistance with intermediate shunt smoothing capacitor to a point in the local oscillator tuned circuit having D.C. blocking capacitors on either side, one of them being the voltage variable capacitor.
GB1293455A 1955-05-04 1955-05-04 Automatic frequency control system for frequency modulation receivers Expired GB797084A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1293455A GB797084A (en) 1955-05-04 1955-05-04 Automatic frequency control system for frequency modulation receivers
FR1148196D FR1148196A (en) 1955-05-04 1956-04-26 Automatic frequency control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1293455A GB797084A (en) 1955-05-04 1955-05-04 Automatic frequency control system for frequency modulation receivers

Publications (1)

Publication Number Publication Date
GB797084A true GB797084A (en) 1958-06-25

Family

ID=10013818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1293455A Expired GB797084A (en) 1955-05-04 1955-05-04 Automatic frequency control system for frequency modulation receivers

Country Status (2)

Country Link
FR (1) FR1148196A (en)
GB (1) GB797084A (en)

Also Published As

Publication number Publication date
FR1148196A (en) 1957-12-04

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