GB492635A - Improvements in superheterodyne receiving apparatus - Google Patents

Improvements in superheterodyne receiving apparatus

Info

Publication number
GB492635A
GB492635A GB2049/38A GB204938A GB492635A GB 492635 A GB492635 A GB 492635A GB 2049/38 A GB2049/38 A GB 2049/38A GB 204938 A GB204938 A GB 204938A GB 492635 A GB492635 A GB 492635A
Authority
GB
United Kingdom
Prior art keywords
jan
indicator
frequency
tuning
receiving apparatus
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
GB2049/38A
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.)
Industrie Magneti Marelli SRL
Marelli Europe SpA
Original Assignee
Fabbrica Italiana Magneti Marelli SpA
Magneti Marelli SpA
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 Fabbrica Italiana Magneti Marelli SpA, Magneti Marelli SpA filed Critical Fabbrica Italiana Magneti Marelli SpA
Publication of GB492635A publication Critical patent/GB492635A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H03J3/14—Visual indication, e.g. magic eye

Landscapes

  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

492,635. Wireless receiving circuits. FABBRICA ITALIANA MAGNETI MARELLI. Jan. 21, 1938, No. 2049. Convention date, Jan. 22, 1937. [Class 40 (v)] In a superheterodyne receiver with automatic frequency control, the disadvantage of leaving the radio frequency stages slightly detuned when the A.F.C. has adjusted the local oscillator frequency to give the true I.F. is obviated by providing a tuning indicator 5, preferably of the cathode-ray type, by means of which the tuning condition of the preselector may be observed and manual adjustment may be made to almost exact tune. The indicator 5 which is energized from a diode rectifier 3, may be connected either to the input or output side of the frequency changer CV-LO. Specifications 456,928 and 471,738 are referred to.
GB2049/38A 1937-01-22 1938-01-21 Improvements in superheterodyne receiving apparatus Expired GB492635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT204092X 1937-01-22

Publications (1)

Publication Number Publication Date
GB492635A true GB492635A (en) 1938-09-23

Family

ID=11166482

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2049/38A Expired GB492635A (en) 1937-01-22 1938-01-21 Improvements in superheterodyne receiving apparatus

Country Status (3)

Country Link
CH (1) CH204092A (en)
DE (1) DE687642C (en)
GB (1) GB492635A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010007731A1 (en) 2010-02-12 2011-08-18 Magna Car Top Systems GmbH, 74321 Storm bar device for folding-top of passenger car, has storm bar levers provided between clamp bracket and roof frame, where length adjuster is supported at one of levers and frame and has set screw accessibly attached at folding-top

Also Published As

Publication number Publication date
DE687642C (en) 1940-02-02
CH204092A (en) 1939-04-15

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