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GB292201A - Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony - Google Patents

Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony

Info

Publication number
GB292201A
GB292201A GB466027A GB466027A GB292201A GB 292201 A GB292201 A GB 292201A GB 466027 A GB466027 A GB 466027A GB 466027 A GB466027 A GB 466027A GB 292201 A GB292201 A GB 292201A
Authority
GB
United Kingdom
Prior art keywords
frequency
thermionic
telephony
relating
electrode
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
GB466027A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB466027A priority Critical patent/GB292201A/en
Priority to FR648449D priority patent/FR648449A/en
Publication of GB292201A publication Critical patent/GB292201A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04B1/26—Circuits for superheterodyne receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

292,201. Gill, E. W. B., and Donaldson, R. H. Feb. 18, 1927. Thermionic generators ; thermionic heterodyne receivers.- A frequency-changing or modulating circuit comprises a negative-resistance four-electrode valve 3 arranged so that its inner grid constitute an output electrode and its outer grid an input electrode, means 1 for applying a modulating-frequency or the frequency to be changed (which may itself be modulated by signals) to the input circuit 2, and means for maintaining the output circuit 6 in oscillation at a different frequency so that the amplitude of the oscillations is controlled in accordance with the first frequency. A reaction coil coupled to the input circuit is connected between the anode and cathode of the valve. When the voltages of the anode and grids and the filament emission are adjusted as described in Specification 252,079, the output circuit oscillates at its natural frequency.
GB466027A 1927-02-18 1927-02-18 Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony Expired GB292201A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB466027A GB292201A (en) 1927-02-18 1927-02-18 Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony
FR648449D FR648449A (en) 1927-02-18 1928-02-06 Improvements in thermionic apparatus for changing or modulating frequency, for use in wireless telephony telegraphy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB466027A GB292201A (en) 1927-02-18 1927-02-18 Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony

Publications (1)

Publication Number Publication Date
GB292201A true GB292201A (en) 1928-06-18

Family

ID=9781374

Family Applications (1)

Application Number Title Priority Date Filing Date
GB466027A Expired GB292201A (en) 1927-02-18 1927-02-18 Improvements in or relating to thermionic frequency changing or modulating devices, suitable for use in wireless telegraphy and telephony

Country Status (2)

Country Link
FR (1) FR648449A (en)
GB (1) GB292201A (en)

Also Published As

Publication number Publication date
FR648449A (en) 1928-12-10

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