GB502706A - Improvements relating to automatic fine tuning in radio receivers - Google Patents

Improvements relating to automatic fine tuning in radio receivers

Info

Publication number
GB502706A
GB502706A GB3054837A GB3054837A GB502706A GB 502706 A GB502706 A GB 502706A GB 3054837 A GB3054837 A GB 3054837A GB 3054837 A GB3054837 A GB 3054837A GB 502706 A GB502706 A GB 502706A
Authority
GB
United Kingdom
Prior art keywords
valve
coil
low
circuit
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
GB3054837A
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.)
HAROLD HUNT
EK Cole Ltd
Original Assignee
HAROLD HUNT
EK Cole 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 HAROLD HUNT, EK Cole Ltd filed Critical HAROLD HUNT
Priority to GB3054837A priority Critical patent/GB502706A/en
Publication of GB502706A publication Critical patent/GB502706A/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
    • H03J7/14—Controlling the magnetic state of inductor cores

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

502,706. Automatic tuning correction. COLE, Ltd., E. K., MARTIN, A. W., and HUNT, H. Nov. 8, 1937, No. 30548. [Class 40 (v)] An automatic tuning correction system comprises a valve VI acting as a variable resist. ance to vary the current through an inductance 3 in dependence on a control voltage derived from a known discriminator network 7, the coil 3 being coupled to a second coil in the circuit whose frequency is to be controlled so as to vary the effective inductance of the second coil, the arrangement being such that the valve V1 also operates as a low frequency amplifier, deriving its low-frequency input over condenser 10 the output passing over condenser 11. The resistance 9 maintains the cathode potential of VI substantially constant despite variations in impedance of the valve. The valve V1 is preferably a multi-grid valve the coil 3 being connected in circuit with one of the grids other than the control grid while the L.F. output is taken from the anode circuit ; this prevents low-frequency signals from affecting the A.F.C. action, Fig. 2 (not shown). Or the control valve may form the hexode portion of a triodehexode, the triode section being the local oscillator of the receiver.
GB3054837A 1937-11-08 1937-11-08 Improvements relating to automatic fine tuning in radio receivers Expired GB502706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3054837A GB502706A (en) 1937-11-08 1937-11-08 Improvements relating to automatic fine tuning in radio receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3054837A GB502706A (en) 1937-11-08 1937-11-08 Improvements relating to automatic fine tuning in radio receivers

Publications (1)

Publication Number Publication Date
GB502706A true GB502706A (en) 1939-03-23

Family

ID=10309360

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3054837A Expired GB502706A (en) 1937-11-08 1937-11-08 Improvements relating to automatic fine tuning in radio receivers

Country Status (1)

Country Link
GB (1) GB502706A (en)

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