US2541649A - Circuit arrangement for the frequency modulation of a carrier wave - Google Patents

Circuit arrangement for the frequency modulation of a carrier wave Download PDF

Info

Publication number
US2541649A
US2541649A US665389A US66538946A US2541649A US 2541649 A US2541649 A US 2541649A US 665389 A US665389 A US 665389A US 66538946 A US66538946 A US 66538946A US 2541649 A US2541649 A US 2541649A
Authority
US
United States
Prior art keywords
circuit
tube
anode
oscillations
frequency
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
US665389A
Other languages
English (en)
Inventor
Hepp Gerard
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2541649A publication Critical patent/US2541649A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/10—Angle modulation by means of variable impedance
    • H03C3/12—Angle modulation by means of variable impedance by means of a variable reactive element
    • H03C3/14—Angle modulation by means of variable impedance by means of a variable reactive element simulated by circuit comprising active element with at least three electrodes, e.g. reactance-tube circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/02—Details
    • H03C3/08—Modifications of modulator to linearise modulation, e.g. by feedback, and clearly applicable to more than one type of modulator

Definitions

  • Fig. 1- is a schematic diagramofia modulation circuit arrangement. according, to. the. invention.
  • Fig. 2 is a schematic diagram; of. another em.- bodiment of the modulation circuit. arrangement according to the invention, ,and
  • Fig. 3 is a. further embodimentof a. modulation circuit arrangement. according to. the. invention.
  • the anode. circuit. of'aselfoscillatingoscillator valve l includesa. tuned circuit 2, 3 which determines the. mean. frequency.
  • a small condenser 5 couplestheanode.circuit. of valve l to the control grid. of areactance. valve 6.
  • the resistance 1 connects the. said control grid to-the cathode of. the valve 6. Due to. the fact that the impedanceof. the condenser. 5" is large compared with the resistance. 1, the; grid voltage of the valve 6. will. lead the anodevoltage of the oscillator valve I by about,90.,.as will also be the case with thecurrentsupplied from the reactance valve. This current passesthrough two series-connected coils. 8.
  • Tuning circuit 2, 3i also has theunmodfulate'd anode current of the oscillator valve. lpassing through it. This results in a variation inthe frequency determined by the. resonant. circuit 2, 3 which varies linearly with the. modulation vol'tages if the anode. current of the valve 6' is.mod-
  • the reactance valve 6 which, as before, is modulated. in its anode. circuit is not connected'directl'y in parallel withthe tuning circuit 2, 3, of' the generator valvel but a tube I2 is interposed betweenthe tube 6 and tube I.
  • the grid of tube l2 is connectedto. the anode of the tube. 6 by means of. a blocking. condenser l3.
  • the. modulation is effected by meansof' a diode 5.4 which acts as a limiter and whose threshold. value is determinednotonly by a. battery IliT-bnt also. by the modulation voltageto be appliedbetween. the terminalsv iii-l6.
  • The. external. circuit of. the tube. includes a. circuit. I i. which is. tuned to. the mean frequency anddampedbya parallel'resistance l8.
  • the oscillations-displaced. in phase by 90 are supplied. to. the diode. system through. a resistance l9. and the modulated.phase-displaced oscillations are applied, similarly to Fig..2',.t'o. the controligridoia buffer. valve l2.
  • a circuit arrangement for frequency modulating a carrier wave comprising a carrier frequency oscillator circuit having a first electron discharge tube having an anode, a control grid and a cathode, a resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a reactance tube circuit comprising a second electron discharge tube having an anode, a control grid and a cathode, means to couple said resonant circuit to the control grid of said second tube to apply a phase quadrature voltage thereto, means to apply operating potentials to said tubes, means to amplitude-modulate the anode potential of said reactance tube to produce amplitude-modulated oscillations substantially 90 out of phase with re spect to the carrier frequency oscillations of said oscillator circuit, means to couple the output of said reactance tube circuit to said resonant circuit to combine the carrier frequency oscillations and the amplitude-modulated quadrature oscillations to produce a frequency-modul
  • a circuit arrangement for frequency modulating a carrier Wave comprising a carrier fre quency oscillator circuit having a first electron discharge tube having an anode, a control grid and a cathode, a resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a reactance tube circuit comprising a second electron discharge tube having an anode, a control grid and a cathode, a capacitor coupling said resonant circuit to the control grid of said second tube to appiy a phase quadrature voltage thereto, means to apply operting potentials to said tube, means to amplitude-modulate the anode potential of said reactance tube to produce amplitude-modulated oscillations substantially 90 out of phase with respect to the carrier frequency oscillations of said oscillator circuit, means inductively coupling the output of said reactance tube circuit to said resonant circuit to combine the carrier frequency oscillations and the amplitude-modulated quadrature oscillation
  • a circuit arrangement for frequency modulating a carrier wave comprising a carrier frequency oscillator circuit having a first electron discharge tube having an anode, a, control grid and a cathode, a resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a reactance tube circuit comprising a second electron discharge tube having an anode, a control grid and a cathode, means to couple said resonant circuit to the control grid of said second tube to apply a phase quadrature voltage thereto, a third electron discharge tube having an input circuit and an output circuit, means to apply operating potentials to said tubes, means to amplitude-modulate the anode potential of said second tube to produce amplitude-modulated oscillations substantially 90 out of phase with respect to the oscillations of said oscillator circuit, means to couple the anode of said second tube to the input circuit of said third tube, and means to couple the output circuit of said third tube to said resonant
  • a circuit arrangement for frequency modulating a carrier Wave comprising a carrier frequency oscillator circuit having a first electron discharge tube having an anode, a control grid and a cathode, a resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a reactance tube circuit comprising a second electron discharge tube having an anode, a control grid and a cathode, a capacitor coupling said resonant circuit to the control grid of said second tube to apply a phase quadrature voltage thereto, a third electron discharge tube having an input circuit and an output circuit, means to apply operating potentials to said tubes, means to amplitude-modulate the anode potential of said second tube to produce amplitude-modulated oscillations substantially out of phase With respect to the oscillations of said oscillator circuit, a second capacitor coupling the anode of said second tube to the input circuit of said third tube, and means to couple the output circuit of said third tube directly to said
  • a circuit arrangement for frequency modulating a carrier Wave comprising a carrier frequency oscillator circuit having a first electron discharge tube having an anode, a control grid and a cathode, a first resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a second electron discharge tube having an anode and a cathode, means coupling said resonant circuit to the anode of said second tube to apply a phase quadrature voltage thereto, a third electron discharge tube having an anode, a control grid and a cathode, a second resonant circuit tuned to said central frequency and coupled to the control grid of said third discharge tube, means to damp said second resonant circuit, means to apply operating potentials to said tubes, means to apply modulating potentials to said second discharge tube to produce amplitude-modulated oscillations in quadrature with the oscillations of said oscillator circuit, means to bias said second tube to limit the applied modulation
  • a circuit arrangement for frequency-modulating a carrier wave comprising a carrier frequency oscillator circuit having a first electron discharge tube having an anode, a control grid and a cathode, a first resonant circuit coupled to the anode of said first discharge tube to determine the central frequency of the oscillations produced by said oscillator circuit, a second electron discharge tube having an anode and a cathode, a first capacitor coupling said resonant circuit to the anode of said second tube to apply a phase quadrature voltage thereto, a third electron discharge tube having an anode, a control grid and a cathode, a second resonant circuit tuned to said central frequency and coupled to the control grid of said third discharge tube, a resistor shunting said second resonant circuit, means to apply operating potentials to said tubes, means to apply modulating potentials to the cathode of said second discharge tube to produce amplitude-modulated oscillations in quadrature with the oscillations of said oscill
  • a circuit arrangement for frequency-modulating a carrier wave comprising means including an oscillator electron discharge tube having an modulation means to prevent direct amplitude modulation of said oscillator tube means, and

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Superheterodyne Receivers (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
US665389A 1942-06-30 1946-04-27 Circuit arrangement for the frequency modulation of a carrier wave Expired - Lifetime US2541649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL247881X 1942-06-30

Publications (1)

Publication Number Publication Date
US2541649A true US2541649A (en) 1951-02-13

Family

ID=19780930

Family Applications (1)

Application Number Title Priority Date Filing Date
US665389A Expired - Lifetime US2541649A (en) 1942-06-30 1946-04-27 Circuit arrangement for the frequency modulation of a carrier wave

Country Status (6)

Country Link
US (1) US2541649A (d)
BE (1) BE451284A (d)
CH (1) CH247881A (d)
FR (1) FR895914A (d)
GB (1) GB641543A (d)
NL (1) NL64026C (d)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666182A (en) * 1950-09-19 1954-01-12 Rca Corp Frequency control apparatus
US2857573A (en) * 1953-05-22 1958-10-21 Rca Corp Frequency modulated transistor oscillator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977095C (de) * 1950-03-07 1965-01-28 Siemens Ag Elektrischer Zweipol in einer Schaltung fuer Frequenzmodulation, Frequenznachstellung oder den Abgleich von Messbrueckenanordnungen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1777410A (en) * 1928-03-06 1930-10-07 Lester L Jones Variable relay condenser
US2350171A (en) * 1942-06-19 1944-05-30 Rca Corp Reactance controlled generator
US2351368A (en) * 1942-06-03 1944-06-13 Rca Corp Reactance tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1777410A (en) * 1928-03-06 1930-10-07 Lester L Jones Variable relay condenser
US2351368A (en) * 1942-06-03 1944-06-13 Rca Corp Reactance tube
US2350171A (en) * 1942-06-19 1944-05-30 Rca Corp Reactance controlled generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666182A (en) * 1950-09-19 1954-01-12 Rca Corp Frequency control apparatus
US2857573A (en) * 1953-05-22 1958-10-21 Rca Corp Frequency modulated transistor oscillator

Also Published As

Publication number Publication date
BE451284A (d)
CH247881A (de) 1947-03-31
NL64026C (d) 1900-01-01
GB641543A (en) 1950-08-16
FR895914A (fr) 1945-02-07

Similar Documents

Publication Publication Date Title
US2066027A (en) Constant frequency generator
US2541649A (en) Circuit arrangement for the frequency modulation of a carrier wave
US2415302A (en) Pulse generating circuit
US2495634A (en) Variable reactance means for frequency modulating an oscillator
US2432720A (en) Amplitude modulation system
US2408192A (en) Electrical apparatus
US2408684A (en) Frequency-variable oscillator circuit
US2223058A (en) Arrangement for modulating highfrequency oscillations
US2394427A (en) Wave length modulation
US2341040A (en) Frequency modulator
US2171148A (en) Superregenerative receiver
US2539952A (en) Frequency modulation
US2378245A (en) Variable frequency oscillator
US2231687A (en) Oscillation generator
US2313071A (en) Oscillation generator and modulator
US2258470A (en) Electronic reactance device
US2151757A (en) Amplifier system
US2605398A (en) Quenched oscillating detector
US1971347A (en) Signaling system
US2119357A (en) Oscillation generator
US2288817A (en) Oscillation modulator
US2268366A (en) Electronic oscillator control device
US2021649A (en) Signaling system
US2302866A (en) Amplifier circuits
US2508982A (en) Superregenerative receiver