US1962582A - Modulating system for ultra-short wave signaling - Google Patents

Modulating system for ultra-short wave signaling Download PDF

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Publication number
US1962582A
US1962582A US576973A US57697331A US1962582A US 1962582 A US1962582 A US 1962582A US 576973 A US576973 A US 576973A US 57697331 A US57697331 A US 57697331A US 1962582 A US1962582 A US 1962582A
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United States
Prior art keywords
electrode
tube
oscillating
wave
ultra
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Expired - Lifetime
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US576973A
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English (en)
Inventor
Clavier Andre Gabriel
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International Communications Laboratories Inc
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International Communications Laboratories Inc
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Publication date
Priority to FR742538D priority Critical patent/FR742538A/fr
Application filed by International Communications Laboratories Inc filed Critical International Communications Laboratories Inc
Priority to US576973A priority patent/US1962582A/en
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Publication of US1962582A publication Critical patent/US1962582A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/68—Tubes specially designed to act as oscillator with positive grid and retarding field, e.g. for Barkhausen-Kurz oscillators
    • H01J25/72—Tubes specially designed to act as oscillator with positive grid and retarding field, e.g. for Barkhausen-Kurz oscillators in which a standing wave or a considerable part thereof is produced along an electrode, e.g. Clavier tube

Definitions

  • micro-ray modulation systems that is, to means for modulating waves in signaling systems in which micro-rays are used.
  • micro-ray will be used here- 5 in to denote any electromagnetic wave having a Wave length lying between the limits of approximately 100 centimeters and 1 centimeter, although t'he wave length may exceed these limits in either direction.
  • a vacuum tube of special construction in which there is a filament or cathode consisting of a straight wire of tungsten or other refractory material, an oscillating or grid electrode wound in a helix so that the filament lies along its axis,.and a reflecting electrode consisting of a metallic cylinder surrounding the oscillating electrode and concentric therewith.
  • the ⁇ object of this invention is to provide improved means for modulating the oscillations generated in such a tube.
  • a feature of this invention is the provision of means for impressing a signal wave on a tube in such a manner that distortionless amplitude modulation can be obtained.
  • Fig. 1 is a graph showing the relation between the voltages applied to the oscillating electrodeV and to the reflecting electrode for constant frequency, and the corresponding power output of the tube for each set of values;
  • Fig. 2 is a circuit diagram showing how amplitude modulation may be obtained.
  • Fig. 3 shows la conventional output device for the oscillations generated by the tube.
  • Vthe curve lies on a substantially straight line with a reduction of about 1 volt Vin the negative voltage applied .to the reflecting electrode for an increase of about 3 volts in the positive voltage applied to the oscillating electrode.
  • this curve also lies on a substantially straight line.
  • a micro-ray tube 1 such as that described above, has a cathode or electron emitting electrode 2, an oscillating or grid electrode 3 and a reflecting electrode or anode 4. It is to be understood that by micro-ray tube is meant a tube which generates oscillations having a Wavelength between 1 and 100 centimeters.
  • the cathode is heated by means of a battery 5 in series with a resistance 6.
  • a battery 7 applies a posilill) IDB Ill)
  • these voltages will be adjusted to approximately the center of that portion of the curve on which the amplitude modulation may be performed, that is, to point H where it will be seen, by reference to Fig. 1, that the voltage applied to the oscillating electrode is approximately plus 290 and the voltage applied to the reflecting electrode is approximately minus 25.
  • the point common to the three batteries may be grounded if desired, but this is not necessary.
  • Vinductance 9 In series with the battery '7 an Vinductance 9 is provided, and in series with the battery 8 an inductance 10 is provided.
  • 'Ihese inductances serve the same function in this circuit that they would in ordinary circuits with radio frequency apparatus, that is, they serve as choke coils to keep the modulating frequency currents out of the batteries.
  • a signal frequency is applied to the device across leads 16.
  • This signal may be voice waves for a telephone conversation, it may be a tone wave for telegraphy, or it may consist of any Wave of single or mixed frequencies in any portion of the frequency spectrum from below audibility up to and including waves of radio frequency.
  • the signal wave is impressed on the circuit through a transformer 11.
  • This transformer is shown in the drawing as a low frequency transformer. In case radio waves are impressed on the circuit this transformer would not, of course, have an iron core such as that indicated in the drawing.
  • the choke coils 9 and 10 would be designed toy keep the modulating radio frequency currents out of the battery circuits.
  • Across the secondary of transformer 1l a potentiometer 12 is connected.
  • This potentiometer is connected through condenser 13 to the oscillating electrode.
  • the other end of the potentiometer is connected tothe common point joining the batteries.
  • a tap 14 on the potentiometer is connected through a condenser 15 to the reilecting electrode.
  • the condensers 13 and 15 act as stopping condensers for the direct current from the batteries.
  • Fig. 3 which shows a conventional output device for the modulated Waves generated by the tube 1
  • the tube 1 is shown placed in front of a reflector 20 which may be of any desired construction, as, for example, a metallic surfaced reflector, parabolic in crosssection.
  • a reflector 20 which may be of any desired construction, as, for example, a metallic surfaced reflector, parabolic in crosssection.
  • the conductor 17 is connected to the opposite ends of the oscillating electrode 3
  • the conductor 18 is connected to the reflecting electrode 4
  • the conductor 19 is connected to the filament 2 of the tube 1.
  • the battery 5 and the potentiometer 6, as shown in Fig. 2 are placed behind the reilector 20.
  • the doublet 21, connected by leads to the opposite ends of the oscillating electrode 3, serves as a radiating element.
  • the greater portion of the modulated oscillations radiated by the doublet 21, as is well understood in the art, are refracted from the surface of the reflector 20 in a direction substantially parallel to the
  • Means for modulating ultra short waves comprising an ultra short wave vacuum tube consisting of a cathode, an oscillating electrode, and a reflecting electrode, a battery for applying potential to said reflecting electrode, a choke coil in series with said battery, potential to said oscillating electrode, a choke coil in series with said battery, a battery for supplying current to said cathode, a potentiometer, a connection between one end of said potentiometer and said cathode, a connection between the other end of said potentiometer and said oscillating electrode, a condenser in said lastmentioned connection, a tap for said potentiometer, a connection between said tap and said reflecting electrode, a condenser in said lastmentioned connection, an input circuit, a transformer the primary of which is connected across said input circuit and the secondary of which is connected across said potentiometer.

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  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
US576973A 1931-11-24 1931-11-24 Modulating system for ultra-short wave signaling Expired - Lifetime US1962582A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR742538D FR742538A (enrdf_load_stackoverflow) 1931-11-24
US576973A US1962582A (en) 1931-11-24 1931-11-24 Modulating system for ultra-short wave signaling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US576973A US1962582A (en) 1931-11-24 1931-11-24 Modulating system for ultra-short wave signaling

Publications (1)

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US1962582A true US1962582A (en) 1934-06-12

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US576973A Expired - Lifetime US1962582A (en) 1931-11-24 1931-11-24 Modulating system for ultra-short wave signaling

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US (1) US1962582A (enrdf_load_stackoverflow)
FR (1) FR742538A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756315C (de) * 1937-08-28 1953-10-05 Julius Pintsch K G Einrichtung bzw. Verfahren zur frequenzkonstanten Amplituden-modulation von Generatoren fuer ultrahochfrequente elektromagnetische Schwingungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415094A (en) * 1938-01-17 1947-02-04 Board Radio measurement of distances and velocities

Also Published As

Publication number Publication date
FR742538A (enrdf_load_stackoverflow) 1933-03-08

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