US2556883A - Reactance tube circuit - Google Patents

Reactance tube circuit Download PDF

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Publication number
US2556883A
US2556883A US10773A US1077348A US2556883A US 2556883 A US2556883 A US 2556883A US 10773 A US10773 A US 10773A US 1077348 A US1077348 A US 1077348A US 2556883 A US2556883 A US 2556883A
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US
United States
Prior art keywords
anode
grid
voltage
circuit
reactance
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
US10773A
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English (en)
Inventor
Robert E Moe
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.)
General Electric Co
Original Assignee
General Electric 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
Priority to BE487522D priority Critical patent/BE487522A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US10773A priority patent/US2556883A/en
Priority to FR981089D priority patent/FR981089A/fr
Application granted granted Critical
Publication of US2556883A publication Critical patent/US2556883A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/042—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant with reactance tube
    • 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

Definitions

  • Another object of my invention is to provide a reactance tube circuit that aids the oscillator rather than loading it.
  • Afu'rther object of my invention is toprovide a reactance tube circuit that'is efiective throughout a wide range o'f frequenci'es.
  • Fig. 1 is a schematic diagram of a typical reactance tube circuit
  • Fig. 2 is a schematic diagram of a reactance tube circuit embodying my invention.
  • a reactance tube circuit using a pentode discharge device I having an anode 2, a cathode :3, a grid 4, a grid and a grid 6.
  • the cathode 3 is connected to ground and the grid 6 is connected to the cathode 3.
  • the anode voltage is supplied from a suitable B+ supply represented conventionally by bus I8, through a radio frequency choke I-I
  • a unidirectional control voltage for grid 4 is supplied from a suitable control source (not shown) through a resistor 9.
  • the grid 5 is supplied from the 13+ supply by a resistor l2 "and is 'by-passed to ground through a capacitor [3.
  • the common terminal of the capacitors'and the resistor 1 is connected to the grid '4.
  • the oscillator [5 may be any suitable self-excited oscillator of which various types are i choke 28.
  • Control grid 26 is connected to ground.
  • the "effect of the additional resistance is to 'load the tuned circuit of the oscillator, in addition to the shunt effect of the phase shift network RC, so that the amplitude of the oscillator varies markedly with the value of the unidirectional control voltage applied to the grid l of the reactance tube I through the resistor 9 which is high in comparison to the resistor 1. Actually, in most instances with this arrangement, it is not possible to obtain the desired amount of frequency shift before the oscillator stops oscillating completely. 7
  • a reactance tube circuit embodying the invention which comprises a discharge device 20 which, for illustration, I have shown as a double triode such as a commercial type 6J6.
  • a discharge device 20 which, for illustration, I have shown as a double triode such as a commercial type 6J6.
  • One section 20a has a cathode'ZZ, control grid 23 and anode 24 and the other section 201) has a cathode'25, control grid 3'6and anode 21.
  • the oscillator I5 is represented asfthe same type as in Fig. 1.
  • the upper end of inductance H is connected to the anode 21 through a coupling capacitor 2 I.
  • Anod'e potential is supplied-from the B+ supply bus 18 to anode 21 through'aradio frequency
  • the cathodes 22 and 25 are tied together and are connected to ground through a radio frequency choke 29.
  • the anode 24 is connected directly to the 13+ supply.
  • the phase shift network, comprising resistance 1 and capacitance 8, is the same as in Fig. 1.
  • the control grid 23 is also again connected to a suitable source of unidirectional control voltage through resistor 9.
  • the reactance circuit of Fig. 2 comprises a cathode-follower section 20a, driving a grounded-grid amplifier section 201), such that an increase in voltage on grid 23 produces a decrease in plate current at plate 21.
  • a reactance circuit comprising first and second electron discharge devices each including an anode, a cathode and a control electrode, said devices having their cathodes connected to a common reference point through a common cathode load impedance so that a voltage applied to the control electrode of said first device produces an anode current change in said second device 180 electrical degrees out of phase therewith, means for impressing an alternating voltage between the anode of said second device and said point, and means comprising a phase shift network interconnecting the anode of said second device with the control electrode of said first device for feeding said voltage between the control electrode of said first device and said point, said network producing a voltage phase shift of less than 90 electrical degrees in the voltage impressed on the grid of said first device,
  • the effective impedance at the anode of said second device to consist of a reactive component and a negative resistance component.
  • a variable reactance circuit comprising first and second electron discharge devices each including an anode, a cathode and a control grid, said devices being coupled together through a common cathode impedance, said second device also having a separate load impedance connected to its anode, whereby a voltage variation at the grid of said first device produces an in-phase voltage variation at the anode of said second device, means for impressing an alternating voltage on said anode of said second device, means comprising an alternating-current phase-shiftin network connected across said second device and said cathode impedance in series, said network having an intermediate point thereon at which a corresponding alternating voltage appears with a phase shift of less than electrical degrees, with respect to said first voltage, a connection from said intermediate point to the grid of said first device, thereby to produce a correspondingly phase-shifted voltage across said cathode impedance and to cause the effective impedance across the anode of said second device and said cathode impedance in series to consist of a reactive component
  • a variable reactance circuit for controlling the frequency of a, high frequency oscillatory system comprising first and second electron discharge devices each having a cathode, an anode, and a control grid, said devices being coupled together through a common cathode impedance connected from their cathodes to a reference point, means connecting said anodes to said point through sources of anode operating potential, said second device also having a separate anode load impedance and having its grid connected directly to said point, means for impressing high frequency voltages from said oscillatory system between the anode of said second device and said point, means for impressin low frequency and unidirectional control potentials between the grid of said first device and said point, a phase shifting network connected from the anode of said second device to said point comprising a resistive and a reactive element in series, and a connection from the grid of said first device to a point on said network located between said resistive and reactive elements and at which high frequency voltage appears with a phase shift of somewhat less than 90 electrical degrees, whereby the effective im

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US10773A 1948-02-25 1948-02-25 Reactance tube circuit Expired - Lifetime US2556883A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE487522D BE487522A (fr) 1948-02-25
US10773A US2556883A (en) 1948-02-25 1948-02-25 Reactance tube circuit
FR981089D FR981089A (fr) 1948-02-25 1949-02-18 Tube à réactance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10773A US2556883A (en) 1948-02-25 1948-02-25 Reactance tube circuit

Publications (1)

Publication Number Publication Date
US2556883A true US2556883A (en) 1951-06-12

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ID=21747353

Family Applications (1)

Application Number Title Priority Date Filing Date
US10773A Expired - Lifetime US2556883A (en) 1948-02-25 1948-02-25 Reactance tube circuit

Country Status (3)

Country Link
US (1) US2556883A (fr)
BE (1) BE487522A (fr)
FR (1) FR981089A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2637838A (en) * 1950-05-10 1953-05-05 Gen Electric Amplitude modulation circuit

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140339A (en) * 1935-10-03 1938-12-13 Rca Corp Frequency control circuits
US2181909A (en) * 1937-12-04 1939-12-05 Bell Telephone Labor Inc Negative impedance circuit
US2248132A (en) * 1940-01-27 1941-07-08 Rca Corp Frequency modulation
US2258470A (en) * 1940-04-27 1941-10-07 Radio Patents Corp Electronic reactance device
US2441504A (en) * 1945-08-25 1948-05-11 Gen Railway Signal Co Radio transmitting system
US2469194A (en) * 1942-12-12 1949-05-03 Gen Electric Reactance tube circuit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2140339A (en) * 1935-10-03 1938-12-13 Rca Corp Frequency control circuits
US2181909A (en) * 1937-12-04 1939-12-05 Bell Telephone Labor Inc Negative impedance circuit
US2248132A (en) * 1940-01-27 1941-07-08 Rca Corp Frequency modulation
US2258470A (en) * 1940-04-27 1941-10-07 Radio Patents Corp Electronic reactance device
US2469194A (en) * 1942-12-12 1949-05-03 Gen Electric Reactance tube circuit
US2441504A (en) * 1945-08-25 1948-05-11 Gen Railway Signal Co Radio transmitting system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2637838A (en) * 1950-05-10 1953-05-05 Gen Electric Amplitude modulation circuit

Also Published As

Publication number Publication date
FR981089A (fr) 1951-05-22
BE487522A (fr)

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