US2441955A - Oscillator modulator - Google Patents

Oscillator modulator Download PDF

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Publication number
US2441955A
US2441955A US529449A US52944944A US2441955A US 2441955 A US2441955 A US 2441955A US 529449 A US529449 A US 529449A US 52944944 A US52944944 A US 52944944A US 2441955 A US2441955 A US 2441955A
Authority
US
United States
Prior art keywords
oscillator
winding
circuit
frequency
transformer
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 - Lifetime
Application number
US529449A
Other languages
English (en)
Inventor
Edward J Coxey
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE468182D priority Critical patent/BE468182A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US529449A priority patent/US2441955A/en
Priority to GB683/45A priority patent/GB584596A/en
Priority to CH253135D priority patent/CH253135A/de
Priority to FR928308D priority patent/FR928308A/fr
Application granted granted Critical
Publication of US2441955A publication Critical patent/US2441955A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H03C1/20—Amplitude modulation by means of discharge device having at least three electrodes carrier applied to control grid modulating signal applied to anode

Definitions

  • This invention relates to new and useful improvements in electric oscillatorsrand more par- 8 Claims. (Cl. 17g-171.5).
  • One of the objects of this invention is to provide a modulator-oscillator with a minimum of parts.
  • Another object of the invention is to reduce circuit losses to a minimum and to obtain 100% modulation by simple means.
  • a further object of the invention is to provide a fully modulated D. C. power supply for an intermediate or the final stage, particularly for the tank circuit of a. transmitter as used in ship communications or wherever a modulator using a minimum of .components is needed.
  • a specific object of the invention is to provid asingle inductance element, serving both as oscillator and modulator element.
  • Still another object of the invention is an audio-oscillator modulating -a transmitter by means of 'acombined oscillator and modulator transformer.
  • An additional object of the invention is an audio-oscillator, of the magnetic ⁇ or capacitive feedbackv type, comprising a transformer serving simultaneously as an oscillation inductance and as a modulation transformer feeding the plate circuit of an intermediate or the final stage of y a radio transmitter.
  • FIG. 1 A preferred embodiment of the invention is diagrammatically shown in the drawing, Fig. 1 illustrating as much of an audio frequency oscillator of the Hartley type as is necessary for an understanding of the principles of the invention.
  • Fig. 2 is a diagram of a modified circuit.
  • I is an audio-oscillator tube in circuit with a transformer 2.
  • Winding 3 of transformer 2 connects, at one terminaLto the grid of tube I and, at its second terminal, over grid leak resistor 4 and grid blockingcondenser 5 to ground.
  • Second winding 6 of transformer 2 connects to the plate of tube I.
  • the oscillator thus formed represents a modified Hartley or magnetic feedback circuit.
  • 'I'uning condenser I2 may be used in parallel with transformer winding 6 or with any other part of transformer 2, as required.
  • Transformer winding 6 is connected to the high voltage B+ and also grounded over Joy-pass condenser 1.
  • B+ supplies plate *UNITED f STATES PATENT.
  • the singlecomponent 2 is shown to operate as a modulation transformer as well as an inductance ofthe oscillator circuit.
  • the circuit shown in Fig. 2 employs a modified Hartley oscillator, 'the inductive portion of which, an auto-transformerrlB, Ais extended ⁇ at
  • the invention is not restricted to modulating the D. C. supply of a finalv amplifier stage. It may be found desirable toV plate modulate a low power stage and amplify the modulated routput of the low power stage by ymeans of higher power linear amplifiers. Y
  • the invention is not limited to the type of oscillator shown. Many types of oscillators, such as capacity feedback oscillation circuits. may be adapted to obtain oscillation-modulation in .accordance withl the invention, without exceeding the scopethereof. l .Y Y
  • the invention is-not limited to the method and type of modulation in which. the"v modulating ⁇ signal is applied in the plate circuit of aradio frequency power amplier.
  • An -oscillatorfmodulator system ⁇ for a Aradio transmitter having a-plurality ofstages comprising an oscillator tube for producing audio frequencies, said tube having a grid circuit comprising one winding of a transformer, a tank circuit comprising a second winding of said transformer, a source of positive D. C. power supply applied to one end of said second winding, capacitance tuning means in parallel to said second winding, a tank circuit of a high frequency containing an nductance portion extending Vloepedance of said coil approximately matching,
  • the load impedance presented by the output circuit of saidhigh frequency amplier means for ⁇ adjustingthe im-4 pedance of the coil andan audoIosc'iilator/f fu.)lsalidfwindingendl-and said point, whereby said ulate to cut off the direct current flowing-through f coupled across a portion of 'said coilfto mod the coil to said high frequency stage'.
  • a tuning capacitor and means including; a? Space discharge device connectedacross spaced ⁇ points on said coil f or generating andisuperposing a pulsating voltager at the said audio frequency on the' dir ect current ovving to' s aidzhigh frequency stage, the magnitude of said ⁇ current beingsufficient-V at alternateY peak values to ⁇ substantially-:stop the flow. of .currentfrornj said source to said; transmitten.V Y Y 4.
  • a sourceof anode current for VsaidY system any inductive Winding having a plurality of ccnriectionsl thereto, one --of said connections beingvadjustablega space discharge device connected asan oscillator utilizing andanother. portion 'extending beyond said-r'stnamed portion and ⁇ including Vsaid-L adjustable' connection.
  • adevice for modulating the output'o'f a system containingl oneV or more space discharge devices, at leastone ofjsaid devices operatingas Y Y 4 an oscillator, a source of anode voltage, a connection leading to the anode circuit of one or more space ydischarge devices withiin said system, an inductive winding having an adjustable portion thereofjoining said source and said connection, a space discharge device external to said system having, a, cathode, anode A and a controlfgrid, azsecond connection fromsaid cathode to ground', a third connection through a blocking condenser from said control grid to the end of Vsaid windingV not included in said first-named 'portiong afourth connection from said anode to apoint insaid,r stvnamed portion of said Winding, and'avariab-le- Vcapacitor connected across external space'discharge device will operate as anzoscillatr
  • saidi system anoc'le i circuit connection:A to said- Winding, Vsaid ⁇ conne ⁇ ction 'heing adjustablyl connectabletothose portionsof said Winding at, in proximityto,l andi extendingV 8.
  • amplifierA ccunprisin'g ⁇ anoscillator and a transformena portion oftfsaid'transformer coupledto ⁇ fsaid oscillator andforming the: tank circuitthereof, a direct', voltage Asupply sourcecoupled Vtofsaidl ⁇ one portion, and? means for couplingsalid; amplifier to" another portionv of saidtransfor-mer l for modulation thereby.

Landscapes

  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US529449A 1944-04-04 1944-04-04 Oscillator modulator Expired - Lifetime US2441955A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE468182D BE468182A (enrdf_load_stackoverflow) 1944-04-04
US529449A US2441955A (en) 1944-04-04 1944-04-04 Oscillator modulator
GB683/45A GB584596A (en) 1944-04-04 1945-01-08 An oscillator system for modulating the operating potential for an electric device
CH253135D CH253135A (de) 1944-04-04 1945-10-04 Oszillator-Modulator-Anordnung.
FR928308D FR928308A (fr) 1944-04-04 1946-01-12 Oscillateurs électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US529449A US2441955A (en) 1944-04-04 1944-04-04 Oscillator modulator

Publications (1)

Publication Number Publication Date
US2441955A true US2441955A (en) 1948-05-25

Family

ID=24109958

Family Applications (1)

Application Number Title Priority Date Filing Date
US529449A Expired - Lifetime US2441955A (en) 1944-04-04 1944-04-04 Oscillator modulator

Country Status (5)

Country Link
US (1) US2441955A (enrdf_load_stackoverflow)
BE (1) BE468182A (enrdf_load_stackoverflow)
CH (1) CH253135A (enrdf_load_stackoverflow)
FR (1) FR928308A (enrdf_load_stackoverflow)
GB (1) GB584596A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114107A (en) * 1960-12-06 1963-12-10 Packard Bell Electronics Corp Radio frequency transmitter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1984451A (en) * 1931-09-15 1934-12-18 American Telephone & Telegraph Short wave radio signaling
US2006440A (en) * 1926-04-05 1935-07-02 Csf Vacuum tube generator system
US2037160A (en) * 1931-01-13 1936-04-14 Rca Corp Radio frequency oscillator
GB450150A (en) * 1935-01-05 1936-07-06 Leslie Harold Paddle Improvements in or relating to radio receiving systems
US2262630A (en) * 1938-06-27 1941-11-11 Fernseh Ag Iron core inductance

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2006440A (en) * 1926-04-05 1935-07-02 Csf Vacuum tube generator system
US2037160A (en) * 1931-01-13 1936-04-14 Rca Corp Radio frequency oscillator
US1984451A (en) * 1931-09-15 1934-12-18 American Telephone & Telegraph Short wave radio signaling
GB450150A (en) * 1935-01-05 1936-07-06 Leslie Harold Paddle Improvements in or relating to radio receiving systems
US2262630A (en) * 1938-06-27 1941-11-11 Fernseh Ag Iron core inductance

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114107A (en) * 1960-12-06 1963-12-10 Packard Bell Electronics Corp Radio frequency transmitter

Also Published As

Publication number Publication date
GB584596A (en) 1947-01-17
BE468182A (enrdf_load_stackoverflow)
FR928308A (fr) 1947-11-25
CH253135A (de) 1948-02-15

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