GB551064A - Improvements in or relating to radio receivers - Google Patents

Improvements in or relating to radio receivers

Info

Publication number
GB551064A
GB551064A GB1637441A GB1637441A GB551064A GB 551064 A GB551064 A GB 551064A GB 1637441 A GB1637441 A GB 1637441A GB 1637441 A GB1637441 A GB 1637441A GB 551064 A GB551064 A GB 551064A
Authority
GB
United Kingdom
Prior art keywords
band
condensers
parallel
coils
effected
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
GB1637441A
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.)
Koninklijke Philips NV
Original Assignee
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB1637441A priority Critical patent/GB551064A/en
Publication of GB551064A publication Critical patent/GB551064A/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
    • H03J3/10—Circuit arrangements for fine tuning, e.g. bandspreading

Landscapes

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

Abstract

551,064. Wireless receiving apparatus. PHILIPS LAMPS, Ltd. (Naamlooze Vennootschap Philips' Gloeilampenfabrieken). Dec. 18, 1941, No. 16374. [Class 40 (v)] A receiver adapted to be tuned in a continuous manner over a broad short-wave range, and also to be tuned with band-spreading in at least two narrow short-wave bands, in which the bandspread tuning is effected by the same variable condenser used for continuous tuning and fixed condensers are connected in series and in parallel with the variable condenser, is characterized in that the same series and parallel capacity is used for the various spread-bands and changing from one such band to another is effected by varying the inductance of the resonant circuit. The Figure shows the invention applied to the preselector and oscillator circuits 2, 3 of a mixer 1 the intermediate frequency output of which is applied through a tuned circuit 4 to the subsequent stages 5. With switches 12, 22 in the positions shown, continuous tuning over a broad short wave band is effected by ganged variable condensers 10, 20 in conjunction with coils 11 and 21 respectively. When switches 12, 22 are moved to the lower position, condensers 13, 14 and 23, 24 are connected in series and parallel with condensers 10, 20 for band-spreading, the particular spread band being selected by connecting one of coils 16 ... 18 or 26 ... 28 in parallel with coils 11 and 21 by means of switches 15 and 25.
GB1637441A 1941-12-18 1941-12-18 Improvements in or relating to radio receivers Expired GB551064A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1637441A GB551064A (en) 1941-12-18 1941-12-18 Improvements in or relating to radio receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1637441A GB551064A (en) 1941-12-18 1941-12-18 Improvements in or relating to radio receivers

Publications (1)

Publication Number Publication Date
GB551064A true GB551064A (en) 1943-02-05

Family

ID=10076161

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1637441A Expired GB551064A (en) 1941-12-18 1941-12-18 Improvements in or relating to radio receivers

Country Status (1)

Country Link
GB (1) GB551064A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434299A (en) * 1940-08-28 1948-01-13 Hartford Nat Bank & Trust Co Radio receiver with band-spread control for a number of comparatively narrow frequency bands
US2492519A (en) * 1944-03-11 1949-12-27 Hartford Nat Bank & Trust Co Band-spread tuning circuit for radio receivers
US2495624A (en) * 1944-03-16 1950-01-24 Hartford Nat Bank & Trust Co Radio receiver with band-spread tunable circuits
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2434299A (en) * 1940-08-28 1948-01-13 Hartford Nat Bank & Trust Co Radio receiver with band-spread control for a number of comparatively narrow frequency bands
US2589331A (en) * 1942-11-12 1952-03-18 Hartford Nat Bank & Trust Co Radio-frequency receiver with band-spread tuning
US2492519A (en) * 1944-03-11 1949-12-27 Hartford Nat Bank & Trust Co Band-spread tuning circuit for radio receivers
US2495624A (en) * 1944-03-16 1950-01-24 Hartford Nat Bank & Trust Co Radio receiver with band-spread tunable circuits

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