GB630321A - Improvements in or relating to superheterodyne receivers - Google Patents

Improvements in or relating to superheterodyne receivers

Info

Publication number
GB630321A
GB630321A GB33291/46A GB3329146A GB630321A GB 630321 A GB630321 A GB 630321A GB 33291/46 A GB33291/46 A GB 33291/46A GB 3329146 A GB3329146 A GB 3329146A GB 630321 A GB630321 A GB 630321A
Authority
GB
United Kingdom
Prior art keywords
coil
amplifier
valve
circuit
coupled
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
GB33291/46A
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 GB630321A publication Critical patent/GB630321A/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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

630,321. Valve circuits for radio reception. PHILIPS LAMPS, Ltd. Nov. 8, 1946, No. 33291. Convention date,. May 3, 1943. [Class 40 (v)] The output of the I.F. amplifier valve 1 of a superheterodyne receiver is coupled to an inductor 3 in the input circuit of an amplifier valve 4. This input circuit or a second input circuit of the amplifier also includes a highlyselective tuned circuit 5 tuned to the carrier frequency and arranged such that the I.F. signal applied to valve 4 is not affected thereby. The tuned circuit is regeneratively coupled to the output of the amplifier to increase the selectivility of the circuit and the output from the amplifier which is applied to demodulator 11 consists of a carrier exalted signal, the level of the sidebands relative to each other being unchanged. Circuit 5 is automatically maintained in tune with the carrier by means of a coil 8, having a magnetic core whose permeability is controlled by the anode current of valve 17 flowing through coil 18. This current is controlled by a control voltage obtained from an error detector comprising diodes 13, 14, to which the I.F. signal is fed in push-pull via coil 12 coupled to coil 2 and the selected carrier is fed in parallel from coil 16 coupled to the anode circuit of the amplifier. Asymmetry of the frequency response of the filter due to the capacity to earth from coil 3 and to the capacity between the final I.F. stage 1 and coil 3 is corrected by means of condensers 19 and 20. Stability of the damping reduction is obtained by negative feedback resistor 9 in the cathode of valve 4.
GB33291/46A 1943-05-03 1946-11-08 Improvements in or relating to superheterodyne receivers Expired GB630321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL254962X 1943-05-03

Publications (1)

Publication Number Publication Date
GB630321A true GB630321A (en) 1949-10-11

Family

ID=19781258

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33291/46A Expired GB630321A (en) 1943-05-03 1946-11-08 Improvements in or relating to superheterodyne receivers

Country Status (7)

Country Link
US (1) US2483315A (en)
BE (1) BE455596A (en)
CH (1) CH254962A (en)
DE (1) DE869222C (en)
FR (1) FR903904A (en)
GB (1) GB630321A (en)
NL (1) NL75716C (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2847567A (en) * 1955-06-10 1958-08-12 Hoffman Electronics Corp Automatic frequency control circuit
US3470485A (en) * 1965-12-28 1969-09-30 Nippon Electric Co Cascaded transistor amplifiers

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468834A (en) * 1935-12-13 1937-07-13 Marconi Wireless Telegraph Co Improvements in or relating to radio or like carrier wave receivers
US2256070A (en) * 1940-07-09 1941-09-16 Rca Corp Radio receiving system

Also Published As

Publication number Publication date
DE869222C (en) 1953-03-02
FR903904A (en) 1945-10-22
CH254962A (en) 1948-05-31
NL75716C (en)
US2483315A (en) 1949-09-27
BE455596A (en)

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