GB271465A - Improved circuit arrangement for modulating the oscillations generated by a thermionic device - Google Patents

Improved circuit arrangement for modulating the oscillations generated by a thermionic device

Info

Publication number
GB271465A
GB271465A GB13036/27A GB1303627A GB271465A GB 271465 A GB271465 A GB 271465A GB 13036/27 A GB13036/27 A GB 13036/27A GB 1303627 A GB1303627 A GB 1303627A GB 271465 A GB271465 A GB 271465A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
modulating
resistance
circuit
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
GB13036/27A
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
Publication of GB271465A publication Critical patent/GB271465A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H03C1/16—Amplitude modulation by means of discharge device having at least three electrodes
    • H03C1/18—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid
    • H03C1/22—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to same grid

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Hybrid Cells (AREA)

Abstract

271,465. Naamlooze Vennootschap Philips' Gloeilampenfabrieken. May 22, 1926, [Convention date]. Thermionic modulating and keying systems.- The modulating device M, e.g. the key or microphone, is arranged to vary the impedance of an auxiliarv valve EH which is connected in series with a resistance R forming part of the grid circuit of a valve TH which forms part of the gridleak circuit of the valve O to be controlled. The valve EH is provided with grid and anode batteries B, S and a grid leak LW so that the charge applied when the key is depressed can leak away. Owing to the rectifying properties of the valves EH, TH the battery S may be replaced by an alternating source which for telephony is of a frequency above audibility. The biasing battery VB and the resistance R are so chosen that the desired current flows in the grid circuit of the valve 0 which may be an oscillator or an amplifier fed from an independent drive. The grid leak path of the valve O preferably includes an inductance L and a resistance W in addition to the anode-cathode discharge path of the valve TH.
GB13036/27A 1926-05-22 1927-05-14 Improved circuit arrangement for modulating the oscillations generated by a thermionic device Expired GB271465A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL271465X 1926-05-22

Publications (1)

Publication Number Publication Date
GB271465A true GB271465A (en) 1927-09-22

Family

ID=19781957

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13036/27A Expired GB271465A (en) 1926-05-22 1927-05-14 Improved circuit arrangement for modulating the oscillations generated by a thermionic device

Country Status (6)

Country Link
US (1) US1784610A (en)
BE (1) BE342399A (en)
DE (1) DE491329C (en)
FR (1) FR633555A (en)
GB (1) GB271465A (en)
NL (1) NL18677C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690495A (en) * 1945-03-19 1954-09-28 United Shoe Machinery Corp Seam welding of thermoplastic sheets
US2589477A (en) * 1946-03-28 1952-03-18 Rca Corp Oscillation generator system
US2760069A (en) * 1952-11-22 1956-08-21 Westinghouse Electric Corp Electronic keying
EP1968843B1 (en) * 2005-12-29 2012-03-28 Volvo Trucks North America Removably clamped platform

Also Published As

Publication number Publication date
FR633555A (en) 1928-01-31
DE491329C (en) 1930-02-08
US1784610A (en) 1930-12-09
NL18677C (en)
BE342399A (en)

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