US1755386A - Vacuum-tube generator system - Google Patents

Vacuum-tube generator system Download PDF

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Publication number
US1755386A
US1755386A US99740A US9974026A US1755386A US 1755386 A US1755386 A US 1755386A US 99740 A US99740 A US 99740A US 9974026 A US9974026 A US 9974026A US 1755386 A US1755386 A US 1755386A
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United States
Prior art keywords
circuit
inductance
potential
tap
plate
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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
US99740A
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English (en)
Inventor
Chireix Henri
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Individual
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Individual
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Publication date
Priority to NL20201D priority Critical patent/NL20201C/xx
Application filed by Individual filed Critical Individual
Priority to DES81647D priority patent/DE489942C/de
Priority to US423308A priority patent/US2006440A/en
Application granted granted Critical
Publication of US1755386A publication Critical patent/US1755386A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/10—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being vacuum tube

Definitions

  • the present invention has as its object improvements in the production'of high frequency currents by means of triodes. plies equally well to communication by pure continuous wave or modulated continuous wave, its chief object being the improvement of the over-all efiiciency of the system ofcommunications by increasing either the efficiency of the transmitter or the constancy of the wave sent out.
  • vention are the fol-lowing:
  • Fig. 1 shows a simple circuit diagram illus- .50 trating one feature of the invention.
  • Fig. 2 shows a group ofcurves illustrating the effect of the invention on parasitic capacities and losses.
  • Fig. t shows a circuit arrangement according to the invention for obtaining constant output frequency in spite of changing voltage on the plate and Fig. 5 shows a symmetrical arrangement according to the invention particularly adapted to the production of very short wave lengths.
  • Fig. is shown at 3 havin its filamentcurrent supplied by the source 2, conventionally represented as a :battery, and its plate voltage sup plied by the source 1, conventionally represented as a direct current generator.
  • the source 1 has one of its terminals grounded as at 9 and its other terminal connected to the :plate of the triode through the choke coil 4.
  • the filament of the triode is connected to ground at 9.
  • An oscillatory circuit comprising a condenser 6 and inductance 7 is connected between the plate and grid, the circuit including the usual blocking condenser 5"to prevent short circuiting. of the source -1, and a shunted condenser 8-:to impart the proper negative bias to the grid;
  • the filament is connected by a variable connection 12 to the inductance?
  • This arrangement causes the triode 3 to oscillate in a well known manner as a self-excited generator of high frequency oscillations whose frequency is determined by the electrical constants of the oscillatory circuit 6-7.
  • this system differs from the usual circuit arrangements in that the inductance coil 4 is variable by means of the movable contact 18; hence,it will be understood-that by moving the contact in the direction of source 1, the high frequency potential across the terminals of the oscillation circuit 67 isdiminished, because the end next to the plateis subject to the full high frequency potential developed in the selfindu'ctance coil, whereas the other endis at ground potential with respect to the high frequency. Hence, the power expended in 1 a self excited triode oscillator the oscillation circuit is reduced by moving the mobile contact in the direction of the source.
  • self-inductance coil 4 could be replaced by two inductance coils of the variable-coupling kind known as a variometer so as to be able to vary the potential applied to circuit 67 gradually.
  • Fig. 1 also discloses a constant inductance coil 10 included in the filament heating circuit and a variable tap 11 connected between the grounded side of source 1 and the coil 7.
  • the grounding point is governed by the position of the variable tap relative to the-inductance coil 7.
  • variable tap 11 coincides with tap 12
  • the filament is grounded from a high frequency viewpoint, and the plate oscillates at high potential.
  • the parasitic capacity 1a of the plate with reference to ground tends to increase the wavelength. This capacity is particularly high when the waves are of very short length, and when the plate 'is cooled by the circulation of water or ofoil.
  • tap 11 is placed at the end of the.
  • the plate is at ground potential from the high frequency view point; but the filament, as will be noted, is then at a high potential which is absorbed by the inductances 10 and 7.. It will be quite evident that under these conditions the parasitic capacity 14 does not come into play at all, while the parasitic capacity 15, which was absent when taps 11 and 12 coincided, now exerts an influence.
  • Fig. 2 are plotted the difierent positions of tap 11 along self-inductance coil 7 as abscissae againstthe wave-length (curve a) determined experimentally and the circuit losses (curve 6) as ordinates, all other things being equal.
  • curve a the wave-length
  • curve 6 the circuit losses
  • Fig. 3 shows a simple arrangement adapted to increase the stability of the waves given off and the efficiency in a tube-equipped transmitting station in which the antenna is indirectly excited.
  • the same reference numerals are used to denote the same elements, in fact, the diagram in Fig. '3 differs from that in Fig. 1 only in that an antenna inductance coil 13 has been added for the object of tuning the antenna 14.
  • the portion of the self-inductance 7 located between tap 11 and tap 16 constitutes the inductive coupling with the antenna.
  • the portion comprised between tap 12 and tap 17 constitutes the grid reaction for the maintenance of os-
  • the reaction is disposed in the oscillation circuit, in other words, ta 17 is ut
  • the present invention consists in providing the reaction in whole or in part in the antenna circuit according to whether the tap 12 coincides with tap 11 or whether it is located above tap 1'1.
  • the frequency of a triode self-generator station depends upon the electric characteristics or constants of the circuits and, to a certain extent, upon the potentials of the tial applied to the grid and is a defect and inconvenience very undesirable in reception inasmuch as it limits the chances of tuning. Conditions can be remedied by various means; two of Which only shall be cited here by way of example. If the plate potential is supplied from an alternator, eitherin series or not in series with a high-potential direct current, it suffices to provide in the grid circuit in series with the grid reactance, a transformer fed from the same alternator. In the presence of a convenient value and phase of this supplementary potential, it is possible to neutralize, or at least reduce conveniently, the amplitude of the frequency variation. It is evidently also feasible to use a saturated inductance coil in the generator circuit in order to counteract the variation occasioned by the inconstant supply potential.
  • Fig. 4 shows one Way of carrying this i scheme into practice, the same comprising the two arrangements hereinbefore referred to, although it will be understood that only one of them is required.
  • 1 and 1 denote the variable high-potential source (in certain cases 1 can be dispensed with entirely)
  • 2 is the low-potential source needed for feeding the filament of triode 3
  • 4 is the choke coil and 5 the blocking condenser.
  • 6 and 7 are theelements of the oscillation circuit and 8 the usual shunted condenser.
  • 10 denotes the transformer and 11 the saturated inductance coil (in diagrammatic form) being the object of the present invention.
  • 19, 20, 21 denote, respectively, an inductance coil, a resistance, and a condenser adapted, if desired, to provide convenient phase for the potentials or the currents to be applied to 10 z and 11.
  • 22 finally represents a battery adapted to superpose on the saturated inductance coil a certain direct current upon the alternating current furnished from transformer 8. It Will be noted that with one of these two ele ments 10 or 11 it is possible to balance the variations introduced by the fact that the plate potential is subject to periodical variations.
  • a circuit arrangement comprising a,
  • vacuum tube oscillator a source of energy for supplying plate voltage thereto having one of its terminals connected to the plate through an inductance, an impedance having one of its terminals connected to said inductance by a variable contact and its other terminal connected to the grid of said oscillator and a variable contact connected to the filament of said oscillator and contacting with said impedance.
  • a circuit arrangement comprising a vacuum tube oscillator, a source of energy for supplying plate voltage thereto having one of its terminals connected to the plate through an inductance, an oscillatory circuit comprising an inductance and a capacity in parallel connected to said first mentioned inductance through a variable contact and to the grid of said oscillator, and a variable contact connected to the filament of said oscillator and contacting with the inductance of said oscillatory circuit.
  • means for reducing the 1085% due to imperfect dielectries and the effect of stray capacities comprising means for feeding the filament of the tube generator through the self-inductance coil of the oscillation circuit, a connection to ground of the filament feeding means,
  • a thermionic valve generator circuit comprising an oscillatory circuit connected between plate and grid electrodes, a filament heating source connected to ground,'the filament heating circuit including a portion of the inductance forming a part of said oscillatory circuit, and an adjustable ground connection to an intermediate point of said inductance, whereby the high frequency potentials of the difierent electrodes are so defined with respect to earth that losses due to bad dielectrics and the influence of parasitic capacities are reduced and the frequency of the emitted Wave stabilized.

Landscapes

  • Geophysics And Detection Of Objects (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Constitution Of High-Frequency Heating (AREA)
  • Hybrid Cells (AREA)
US99740A 1925-08-10 1926-04-05 Vacuum-tube generator system Expired - Lifetime US1755386A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL20201D NL20201C (de) 1926-04-05
DES81647D DE489942C (de) 1926-04-05 1926-08-10 Schaltung zum wahlweise Aussenden von Tonfrequenz oder modulierten ungedaempften Wellen
US423308A US2006440A (en) 1926-04-05 1930-01-25 Vacuum tube generator system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR256653T 1925-08-10

Publications (1)

Publication Number Publication Date
US1755386A true US1755386A (en) 1930-04-22

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ID=31897687

Family Applications (2)

Application Number Title Priority Date Filing Date
US99740A Expired - Lifetime US1755386A (en) 1925-08-10 1926-04-05 Vacuum-tube generator system
US146620A Expired - Lifetime US1776381A (en) 1925-08-10 1926-11-06 Vacuum-tube generator system

Family Applications After (1)

Application Number Title Priority Date Filing Date
US146620A Expired - Lifetime US1776381A (en) 1925-08-10 1926-11-06 Vacuum-tube generator system

Country Status (5)

Country Link
US (2) US1755386A (de)
DE (1) DE579408C (de)
FR (2) FR614231A (de)
GB (2) GB256653A (de)
NL (1) NL20149C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979669A (en) * 1955-06-03 1961-04-11 Philips Corp Circuit arrangement for a high frequency furnace
US3437931A (en) * 1965-12-16 1969-04-08 Gates Radio Co Shunt fed pi-l output network

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2145735A (en) * 1936-01-29 1939-01-31 Gen Electric Short wave radio transmitter
DE967391C (de) * 1942-03-01 1957-11-07 Fernseh Gmbh Schaltung zur Erzeugung von Ablenkstroemen
US2431179A (en) * 1942-10-03 1947-11-18 Rca Corp Multitube self-pulsing oscillator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979669A (en) * 1955-06-03 1961-04-11 Philips Corp Circuit arrangement for a high frequency furnace
US3437931A (en) * 1965-12-16 1969-04-08 Gates Radio Co Shunt fed pi-l output network

Also Published As

Publication number Publication date
FR31599E (fr) 1927-03-17
US1776381A (en) 1930-09-23
DE579408C (de) 1933-06-27
NL20149C (de)
FR614231A (fr) 1926-12-09
GB256653A (de) 1927-05-12
GB262115A (en) 1927-08-11

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