GB906459A - Arrangement for the tuning of oscillators with the aid of line circuits and electrically controllable reactances, preferably for the television band ó( - Google Patents

Arrangement for the tuning of oscillators with the aid of line circuits and electrically controllable reactances, preferably for the television band ó(

Info

Publication number
GB906459A
GB906459A GB2958360A GB2958360A GB906459A GB 906459 A GB906459 A GB 906459A GB 2958360 A GB2958360 A GB 2958360A GB 2958360 A GB2958360 A GB 2958360A GB 906459 A GB906459 A GB 906459A
Authority
GB
United Kingdom
Prior art keywords
tuning
frequency
capacitors
range
oscillators
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
GB2958360A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB906459A publication Critical patent/GB906459A/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
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/18—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance
    • H03B5/1817—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator
    • H03B5/1835—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising distributed inductance and capacitance the frequency-determining element being a cavity resonator the active element in the amplifier being a vacuum tube
    • 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)
  • Superheterodyne Receivers (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

906,459. Automatic frequency-control systems. STANDARD TELEPHONES & CABLES Ltd. Aug. 26, 1960 [Sept. 30, 1959], No. 29583/60. Class 40 (5). A wideband tunable U.H.F. oscillator, e.g. for a television receiver converter, includes a tuning line 1 with tuning and trimmer capacitors 2, 10, respectively, lines 4, 5 indicating the standing wave voltages on the line at limits of the frequency range. A.F.C. is provided by two at least voltage variable resistances, e.g. capacitors 12, 13 located preferably at the voltage nodes 6, 7 so that one at least is effective at each frequency limit and both effective intermediately of the range, so that a desired frequency control throughout the tuning range is obtained. Increased A.F.C. effectiveness with increase of tuning frequency may be obtained by displacing one variable capacitor 12 away from node 6 towards tuning capacitor 2. Different control voltages may be applied to both variable capacitors 12, 13 and each may have different capacity variation characteristics.
GB2958360A 1959-09-30 1960-08-26 Arrangement for the tuning of oscillators with the aid of line circuits and electrically controllable reactances, preferably for the television band ó( Expired GB906459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1959ST015638 DE1242678B (en) 1959-09-30 1959-09-30 Circuit arrangement for the automatic retuning of oscillator circuits made up of lines with the aid of controllable reactance resistors for television receivers

Publications (1)

Publication Number Publication Date
GB906459A true GB906459A (en) 1962-09-19

Family

ID=7456769

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2958360A Expired GB906459A (en) 1959-09-30 1960-08-26 Arrangement for the tuning of oscillators with the aid of line circuits and electrically controllable reactances, preferably for the television band ó(

Country Status (3)

Country Link
BE (1) BE597475A (en)
DE (1) DE1242678B (en)
GB (1) GB906459A (en)

Also Published As

Publication number Publication date
BE597475A (en) 1961-05-25
DE1242678B (en) 1967-06-22

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