GB516647A - Improvements in or relating to automatic frequency control circuits for superheterodyne wireless receivers - Google Patents

Improvements in or relating to automatic frequency control circuits for superheterodyne wireless receivers

Info

Publication number
GB516647A
GB516647A GB19737/38A GB1973738A GB516647A GB 516647 A GB516647 A GB 516647A GB 19737/38 A GB19737/38 A GB 19737/38A GB 1973738 A GB1973738 A GB 1973738A GB 516647 A GB516647 A GB 516647A
Authority
GB
United Kingdom
Prior art keywords
oscillator
resistances
circuit
voltage
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
GB19737/38A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB516647A publication Critical patent/GB516647A/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

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

516,647. Automatic tuning correction. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. July 4, 1938, No. 19737. Convention date, July 3, 1937. [Class 40 (v)] The local-oscillator circuit of a super-heterodyne receiver comprises a tank circuit 15... 17 connected to the oscillator anode 9 and a coil 19 coupled to coil 15 and connected through an impedance 20, 22 to the oscillator grid 8, an automatic-frequencycontrol voltage being applied to the grid 8 and serving to alter the effective reactance of the tank circuit. The A.F.C. voltage is applied through a choke 24<1> which may be of such a value that with the gridcathode capacity of the local oscillator it is resonant at a frequency adjacent the lowfrequency end of the frequency range of the oscillator. The control potential is derived from resistances 103, 104 having a low impedance for direct current, these resistances being connected in the circuit of the intermediate frequency amplifier 102 which acts also as an amplifier for the A.F.C. control voltage produced by a double diode 40 connected as described in Specification 493,511. Suitable values of valve potentials, resistances, capacities &c. are given in the Specification. Specification 497,798 also is referred to.
GB19737/38A 1937-07-03 1938-07-04 Improvements in or relating to automatic frequency control circuits for superheterodyne wireless receivers Expired GB516647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US151794A US2128661A (en) 1937-07-03 1937-07-03 Automatic frequency control system

Publications (1)

Publication Number Publication Date
GB516647A true GB516647A (en) 1940-01-08

Family

ID=22540264

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19737/38A Expired GB516647A (en) 1937-07-03 1938-07-04 Improvements in or relating to automatic frequency control circuits for superheterodyne wireless receivers

Country Status (3)

Country Link
US (1) US2128661A (en)
DE (1) DE712378C (en)
GB (1) GB516647A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498954A (en) * 1946-05-07 1950-02-28 Panoramic Radio Corp Panoramic receiver with means for modifying signal pulses applied to indicators
GB829403A (en) * 1955-04-05 1960-03-02 Standard Coil Prod Co Inc Neutralizing circuits
US3180918A (en) * 1961-01-26 1965-04-27 Conn Ltd C G Tone generator system
US6182747B1 (en) 1995-09-13 2001-02-06 Nautica Dehumidifiers, Inc. Plate-type crossflow air-to-air heat-exchanger comprising side-by-side-multiple small-plates

Also Published As

Publication number Publication date
DE712378C (en) 1941-10-17
US2128661A (en) 1938-08-30

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