GB679176A - Improvements in or relating to discharge tubes for use in frequency-demodulation - Google Patents

Improvements in or relating to discharge tubes for use in frequency-demodulation

Info

Publication number
GB679176A
GB679176A GB22915/48A GB2291548A GB679176A GB 679176 A GB679176 A GB 679176A GB 22915/48 A GB22915/48 A GB 22915/48A GB 2291548 A GB2291548 A GB 2291548A GB 679176 A GB679176 A GB 679176A
Authority
GB
United Kingdom
Prior art keywords
grid
cathode
grids
control
coated
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
GB22915/48A
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
Philips Electronics 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, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB679176A publication Critical patent/GB679176A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/22—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation, e.g. phase detector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/02—Electron-emitting electrodes; Cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Particle Accelerators (AREA)
  • Microwave Tubes (AREA)

Abstract

679,176. Thermionic valves. PHILIPS ELECTRICAL, Ltd. Aug. 31, 1948 [Sept. 3, 1947], No. 22915/48. Class 39 (i). [Also in Group XL (c)] In a frequency modulation detector (see Group XL (c)) two voltages with a phase difference depending on the frequency deviation are applied to the two control grids of a valve with at least five grids. The mutual conductances of the grids are made lower than the saturated anode current in milliamps divided by four volts. A tubular cathode 18 is surrounded by an accelerator grid 19, first control grid 21, first screen grid 22, second control grid 23 and a second screen grid 25, all of elliptical crosssection, and a circular cylindrical anode 24. The pitch of the control grids 21, 23 is so arranged that at least two sections of the second control grid 23 of different pitch cooperate with a section of grid 21 of constant pitch. The tubular cathode is coated with electron emitter over a short length (1-10 mms.). The accelerator grid 19 and first screen grid 22 are connected to a positive voltage source of less than 40 volts. In order to reduce the current taken by the first grid, two rods, preferably connected to the cathode, may be provided between the cathode and the supports of the grid or the cathode may be coated only on the sides opposite the active part of the grid and the supports coated with insulating material on their inner sides.
GB22915/48A 1947-09-03 1948-08-31 Improvements in or relating to discharge tubes for use in frequency-demodulation Expired GB679176A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL266765X 1947-09-03

Publications (1)

Publication Number Publication Date
GB679176A true GB679176A (en) 1952-09-17

Family

ID=19781765

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22915/48A Expired GB679176A (en) 1947-09-03 1948-08-31 Improvements in or relating to discharge tubes for use in frequency-demodulation

Country Status (7)

Country Link
US (1) US2760067A (en)
BE (1) BE484647A (en)
CH (1) CH266765A (en)
DE (1) DE826760C (en)
FR (1) FR988495A (en)
GB (1) GB679176A (en)
NL (1) NL71107C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE969436C (en) * 1951-04-26 1958-06-04 Lorenz C Ag Arrangement for demodulating frequency or phase modulated oscillations

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2086271A (en) * 1934-07-04 1937-07-06 Telefunken Gmbh Electron discharge device
NL45032C (en) * 1934-12-27
NL46575C (en) * 1935-01-31
US2090218A (en) * 1935-06-25 1937-08-17 Hygrade Sylvania Corp Electron discharge device
BE426298A (en) * 1937-02-12
US2286337A (en) * 1937-11-27 1942-06-16 Telefunken Gmbh Negative feedback circuit
US2228980A (en) * 1938-09-27 1941-01-14 Telefunken Gmbh Electron discharge device
US2235498A (en) * 1940-01-11 1941-03-18 Rca Corp Electron discharge device
BE469561A (en) * 1942-05-06
US2379764A (en) * 1942-06-06 1945-07-03 Rca Corp Frequency modulation detection
US2441254A (en) * 1945-08-04 1948-05-11 Remco Electronic Inc Symmetrical space charge tube
US2460062A (en) * 1945-11-23 1949-01-25 Philco Corp Grid controlled electron tube

Also Published As

Publication number Publication date
CH266765A (en) 1950-02-15
US2760067A (en) 1956-08-21
DE826760C (en) 1952-01-03
FR988495A (en) 1951-08-28
BE484647A (en)
NL71107C (en)

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