GB525869A - Improvements in superheterodyne radio-receivers - Google Patents

Improvements in superheterodyne radio-receivers

Info

Publication number
GB525869A
GB525869A GB15477/39A GB1547739A GB525869A GB 525869 A GB525869 A GB 525869A GB 15477/39 A GB15477/39 A GB 15477/39A GB 1547739 A GB1547739 A GB 1547739A GB 525869 A GB525869 A GB 525869A
Authority
GB
United Kingdom
Prior art keywords
circuit
frequency
control
intensity
feed
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
GB15477/39A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB525869A publication Critical patent/GB525869A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H03G5/26—Automatic control in frequency-selective amplifiers having discharge tubes

Landscapes

  • Superheterodyne Receivers (AREA)

Abstract

525,869. Superheterodyne circuits for wireless reception. PHILIPS LAMPS, Ltd. May 24, 1939, No. 15477. Convention date, May 27, 1938. [Class 40 (v)] Selectivity control, equivalent to a variation in coupling between the tuned circuits 2, 3 of an intermediate-frequency band-pass filter, is effected by connecting a circuit 7 tuned to the intermediate frequency in series with the capacity or inductance of the second circuit 3, the circuit 7 being also in the circuit of at least one of the control grids of the mixing tube 10, e.g. in the cathode lead as shown, and applying a varying potential over lead 27 to one of the control grids, e.g. the signal grid 14. The feed-back produced by circuit 7 may be positive or negative but is preferably positive and in this case the control voltage must become more negative with an increase in intensity of the desired signal or a decrease in intensity of an adjacent disturbing frequency. The impedance of circuit 7 may be low so that one side of the oscillator condenser 20 may be grounded without the cathode being at a high-frequency potential and any feed-back between the local oscillator and the signal grid 14 is prevented.
GB15477/39A 1938-05-27 1939-05-24 Improvements in superheterodyne radio-receivers Expired GB525869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE525869X 1938-05-27

Publications (1)

Publication Number Publication Date
GB525869A true GB525869A (en) 1940-09-05

Family

ID=6552750

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15477/39A Expired GB525869A (en) 1938-05-27 1939-05-24 Improvements in superheterodyne radio-receivers

Country Status (1)

Country Link
GB (1) GB525869A (en)

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