US1617974A - Wireless signaling system - Google Patents

Wireless signaling system Download PDF

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Publication number
US1617974A
US1617974A US46769A US4676915A US1617974A US 1617974 A US1617974 A US 1617974A US 46769 A US46769 A US 46769A US 4676915 A US4676915 A US 4676915A US 1617974 A US1617974 A US 1617974A
Authority
US
United States
Prior art keywords
potential
circuit
plate
waves
grid
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
US46769A
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English (en)
Inventor
William C White
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 DENDAT308203D priority Critical patent/DE308203C/de
Priority to NL8754D priority patent/NL8754C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US46769A priority patent/US1617974A/en
Priority to FR519665A priority patent/FR519665A/fr
Application granted granted Critical
Publication of US1617974A publication Critical patent/US1617974A/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

  • a more particular object of my invention is to provide means for varying the amplitude of the continuous waves in accordance with variations in sound waves.
  • I preferably employ an electron discharge device for producing continuous electrical waves in an antenna. If such a device is supplied with a direct current source of constant potential and suitable circuit connections made thereto it may be made 'to produce continuous electrical waves of practically constant amplitude in the antenna. If, however, the potential supplied thereto is variable the amplitude of the waves produced will vary in accordance with the potential variations in the source of supply. Hence if the potential of the supply source is caused to vary in ,accordance.with variations in sound waves the amplitude of the waves produced may be caused to vary accordingly.
  • the means for producing continuous electrical waves in the antenna 1 comprises anelectron discharge device 2 consisting preferably of a highly evacuaited'enve lope having therein a cathode 3 of filamen-.
  • the cathode and anode in the modifications shown in Figs. 1 and 2 are connected respectively 'to conductors 6 and 7, which in 1 turn are connected to-a source ofdirect current 8 of the desired potential.
  • the circuit which includes the cathode andanode also I contains an inductance 9 which is inductiveantenna.
  • the circuit which includes the cathode 3 and the grid 5 contains an'inductance 11 which is inductively related to a s'econd inductance 12 in the antenna.
  • the coupling between- 9 and 10 is preferably close while that between 11 and 12 may in some,cases be made very loose.
  • a battery 13 may be employed for adjusting the normal potential of the grid to a value which is most suitable for the eilicient operation of the device.
  • the circuit which comprises the direct current source of supply 8, the inductance 9, the cathode 3, and anode 4, for convenience of description I designate the plate circuit.
  • the circuit which comprises the grid 5, inductance 11, and cathode 3, I designate the grid circuit. Any desired means may be employed for heating the cathode 3 to incandescence.
  • Fig. 1 I have shown it connected directly across the source-of currenty8 through aresistance 14:
  • the antenna will among other things depend upon the potential of the source of supply 8 and will be constant as long as this potential is constant and other conditions also remain unchanged, but their amplitude will vary in accordance with'any variations in the potential supplied to the' In order to vary, the amplitude of these waves in accordance with variatlons in sound waves, I may supernnpose upon the constant potential of source 8 potential variations iii ' pelled to pass through secondary l6 and the source of energy 8 condensers and 21 are preferably used to provide shunt paths for the high frequency.
  • the modification shown in Fig. 2 differs from that shown in Fig. l in that instead of superimposing the potential variations in secondary 16 directly upon the plate circuit of device 2 they are amplified by means of a second electron device 22 similar in structure to device 2.
  • the coil 12 may be omitted and the coil 11 may be inductively related to coil10.
  • the arrangement shown is preferableasby connecting the circuits in this way the amplitude ofthe oscillations produced is greater than if coil 11. were coupled to coil 10. This may be due to the fact that the phase relation of the currents in the grid and plate circuits with this arrangement is somewhat different than when coil 11 is directly coupled to coil 10 and that this difl'ereuee causes an increase in the amplitude oi the oscillations produced.
  • electron discharge device having plate and grid circuits associated therewith for producing continuous electrical waves in said antenna, a. telephone transmitter for producing potential variations which vary in accordance with variations in sound waves, and means for impressing said potential variations upon the plate circuit only of said electron discharge device.
  • the method of wireless signaling which consists in producing continuous electrical waves in an antenna by means of an electron discharge device having grid and plate circuits associated therewith and varying the.
  • means comprising an electron discharge device having grid and plate clrcuits associated therewith for pro ducingcontinuous electrical waves, andmeans for. supplying a-potential which varies at audio frequencies to the plate circuit only -'of said device' to vary the amplitude "of the waves produced thereby.
  • an electron discharge device for producing continuous electrical waves in said antenna comprising a filamentary cathode, a cooperatinganode, a discharge controlling grid enclosed in a highly evacuated envelope and grid and plate circuit associated therewith, a source said device, a telephone transmitter for pro ducing potential variations which vary in accordance with variations 'in sound waves, and means for impressing said potential variations upon the plate circuit only of said device.
  • said oscillation circuit comprising a fila- 17.
  • the method of signaling which comprises producing continuous electrical waves in an oscillation circuit by means of an electron discharge device having plate and grid clrcuits associated therewith, and varying the amplitude of the waves thus produced by directly applyinga the plate circuit only of said device.
  • said potential va- Y ing an electron emitting cathode, an anode In witness whereof, Ihave hereunto set my hand this 20th day of August, 1915.

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US46769A 1915-08-23 1915-08-23 Wireless signaling system Expired - Lifetime US1617974A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DENDAT308203D DE308203C (xx) 1915-08-23
NL8754D NL8754C (xx) 1915-08-23
US46769A US1617974A (en) 1915-08-23 1915-08-23 Wireless signaling system
FR519665A FR519665A (fr) 1915-08-23 1920-01-26 Perfectionnements apportés à la radiosignalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US46769A US1617974A (en) 1915-08-23 1915-08-23 Wireless signaling system

Publications (1)

Publication Number Publication Date
US1617974A true US1617974A (en) 1927-02-15

Family

ID=21945290

Family Applications (1)

Application Number Title Priority Date Filing Date
US46769A Expired - Lifetime US1617974A (en) 1915-08-23 1915-08-23 Wireless signaling system

Country Status (4)

Country Link
US (1) US1617974A (xx)
DE (1) DE308203C (xx)
FR (1) FR519665A (xx)
NL (1) NL8754C (xx)

Also Published As

Publication number Publication date
DE308203C (xx)
FR519665A (fr) 1921-06-14
NL8754C (xx)

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