US1501830A - Wireless signaling system - Google Patents

Wireless signaling system Download PDF

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Publication number
US1501830A
US1501830A US835433A US1914835433A US1501830A US 1501830 A US1501830 A US 1501830A US 835433 A US835433 A US 835433A US 1914835433 A US1914835433 A US 1914835433A US 1501830 A US1501830 A US 1501830A
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US
United States
Prior art keywords
current
relay
antenna
potential
variations
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
US835433A
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English (en)
Inventor
Ernst F W Alexanderson
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 NL10046D priority Critical patent/NL10046C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US835433A priority patent/US1501830A/en
Priority to FR535489D priority patent/FR535489A/fr
Application granted granted Critical
Publication of US1501830A publication Critical patent/US1501830A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas

Definitions

  • y present invention relates to wireless signaling systems and more particularly to a method of and means for transmitting signals. While inthe description which follows I have shown its application to telephony, it is ada ted for use for transmitting other forms 0 signals as well.
  • a relay or electron discharge device comprising an exhausted envelope containing at least two electrodes and a conducting body or current controlling member in proximity thereto, one of the electrodes being provided with means for causing it to emit electrons.
  • a device of this nature when connected toa source of current operates selectively in such a manner as to allow current to fioW between the electrodes in only one direction; that is, there will be a h flow of negative electricity from the electron emitting electrode to the other electrode or electrodes, but no flow in the opposite direction.
  • I mean a device, the operating current of which is carried entirely by means of electrons independently of gas ionization.
  • the amount of current flowing between the electrodes may be varied by varying the electrical field in their vicinity. This effect may be produced either by varying the electrostatic field in the manner described or by varying the electromagnetic field.
  • the amplitude of the current flow in the antenna may be made de pendent upon the current flow through the relay.
  • the current flow through the relay may in turn be controlled by varying the potential of the current controlling member therein in accordance with current variations produced by the signals which it is desired to transmit.
  • an antenna 1 for transmitting the signals is connected to earth through the usual adjustable condenser 2.
  • the local source of energy for producing the signals is represented by an alternating current generator 3 which should have a frequency much beyond the range of audibility, although other convenient sources of high frequency alternating current may equally well be employed.
  • the circuit to which the source of energy is connected comprises the usual oscillation transformer 4 for transmitting the signals to the antenna and a second air core transformer 5, preferably so designed as to give a comparatively large secondary voltage.
  • the secondary circuit of transformer 5 includes two relays 6 and 7. As illustrated here these relays comprise cathodes 8 of filamentary form, late shaped anodes 9 and intervening grid s aped conducting bodies 10, within a highly evacuated envelope.
  • Local batteries 11. are provided for heating the cathodes to cause them to emit electrons.
  • One terminal of the secondary of transformer 5 is connected to the anode of relay 6 and the cathode of relay 7, while the other terminal is connected to the cathode of relay 6 and the anode of relay 7
  • apparatus of this type permits of the passsage of current in but one direction it will be seen that by the present arrangement means is provided for the passage of both half waves of the alternating current through the secondary circuit.
  • the amount of current which will flow through the relays may be varied by a variation of the potential of the grid shaped bodies 10.
  • a battery 12 of the proper strength and polarit is connected to each of the grids 10. Ith the arrangement thus far described it will be seen that a high frequency current of a certain definite amplitude will flow in the secondary circuit of transformer 5, and that the current communicated to antenna 1 will also have a definite amplitude depending on the amplitude of the current flowing in the secondary circuit of 5.
  • varying the potential of the grids 10 corresponding variations may be produced in the antenna current and such variations may be used to transmit signals of any desired character.
  • the transmitter may be at a distance from the sending station and conn-ected thereto by a transmission line.
  • This transmitter circuit is inductively connected to the grids 10 by means of the transformers 15 whereby variations in the current produced by sound waves produce corresponding variations in the grid potential and these potential variations in turn produce corresponding variations in the amplitude of the antenna current.
  • the antenna current waves instead of having a constant amplitude will vary in direct proportion to the variation in the current produced by the sound waves.
  • This variation in the transmitted waves may, by appropriate receiving devices, be utilized to reproduce the sound waves at a distant point.
  • Fig. 2 I have shown a modification which is the equivalent of the arrangement of Fig. 1 but in which a single relay 16 is employed.
  • the relay in this case has a single cathode 17, two anodes 18 and two interposed grids 19*.
  • the middle point of the secondary of transformer 5 is connected to the cathode 17 and the ends of the secondary are connected to the anodes 18.
  • the variations of potential produced by variations in the local circuit of the microphone transmitter 13 may be impressed upon the grids 19 by means of a single transformer 20, the middle point of the secondary of which may be connected to the cathode as shown.
  • a relay of this type it will usually be found desirable to employ an extra grid 21 surrounding the cathode 17 and impress thereon a constant positive potential from a battery 22 as indicated.
  • the amount of energy which may efiiciently be controlled by the relays is limited by the amplitude of the current variations which may be produced by the transmitter 13 in the local circuit.
  • I may employ another relay to amplify the variations in the speech current as indicated in Fig. 3.
  • a relay 23 similar to those in Fig. 1 may be used.
  • the potential of the grid 10 varies with the variation in the resistance of the transmitter 13 and this IOU produces corresponding variations of much greater amplitude in the current flowing between' the cathode 8 and the anode 9 from the local source of energy 24.
  • These current variations are caused to produce variations in the potential of the grids 19 by means of the transformer 20 as in the arrangement of Fig. 2.
  • Fig. 4 I have indicated a greatly simplified arrangement whereby signals of the same character as those already described may be transmitted.
  • current waves will pass through the relay in only one direction but those half waves which pass through the relay will be varied in amplitude by the current variations produced by the sound waves in the same Way as in the other modifications described.
  • the source of high frequency current may be connected directly in the antenna circuit as shown in Fig. '5. In this case it will usually be found desirable to amplify the varia tions of the current produced by the sound waves by means of a relay 26 which controls the flow of current through the secondary circuit of the transformer 4.
  • Fig. 6 another possible modification is shown in which the source of high frequency current is connected in the circuit of the transmitter 13.
  • the potential of the grid 10 varies constantly by reason of the alternating potential connected thereto and corresponding current variations are produced in the relay 27 which has in its circuit a source of energy 28.
  • the antenna As a result there will be impressed upon the antenna an alternating current of the same frequency as that of the source 3.
  • the amplitude of this current however will vary in accordance with variations in the potential of the grid 10, which variations in turn may be caused by the variations in the resistance of the transmitter-l3 produced by sound waves.
  • the devices used for controlling the current flow may assume a variety of forms, in carrying out my invention in the particular way illustrated and described, I have found that it is preferable to exhaust the envelope of the relay to the highest degree possible. If this is done, as high voltages as desired may be applied to the relay and the current flow through the relay will apparently be the result of a ure electron discharge and substantially independent of any as conductivity. By using high voltages in the relay circuit it will be seen that large amounts of energy may be controlled even though the current flow through the relay is comparatively small. I believe however that in case lower voltages are employed in the relay circuit the principle of operation involved may be carried out by means of other forms of apparatus in which there are appreciable amounts of gas or vapor present.
  • a modulating system comprising an antenna to be supplied with signal waves, means for supplying high frequency power to be modulated to said antenna, an audion having a cathode and anode and an auxiliary electrode, means for serially introducing the impedance between said anode and cathode into said antenna, and means for controlling the potential of said auxiliary electrode in accordance with a signal.
  • a modulating system comprising an antenna to be supplied with signal waves, means for supplying high frequency power to be modulated to said antenna, an audion having a cathode and anode and an auxiliary electrode, means for serially introducing the impedance between said anode and cathode into said antenna whereby all of said high frequency power flows between said anode and said cathode, and means for controlling the potential of said auxiliary electrode in accordance with a signal.
  • an antenna In a radio transmission system, an antenna, a source of oscillations connected thereto, an asymmetric thermionic'impedance element effectively in series with said antenna, said impedance element having a cathode, an anode and an impedance controlling element, and means for varying the potential of said controlling element with respect to said cathode to vary the impedance of said thermionic element in accordance with signals.
  • an antenna In a system for radio transmission, an antenna, a thermionic cathode and an anode in an evacuated vessel and effectively serially included-in said antenna, an impedance control electrode in said vessel, means for impressing an electromotive force of signal wave form upon said electrode, and means for impressing high frequency power to be modulated upon said antenna.
  • a high frequency circuit by means of which energy is directly transmitted to a distantstaision, an asymmetric thermionic ance of saidi circuit in accordance with sigimpeziance device which is eiiectiveiy in senais. 10 ries arrangement in said circuit, said im- In witness whereof, I have hereunto set pedence device having acathcde, an anode my hand this 29th day of April, 1914.
  • cathode is vary the effective series impefi- HELEN 01130121).

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
US835433A 1914-04-30 1914-04-30 Wireless signaling system Expired - Lifetime US1501830A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL10046D NL10046C (fr) 1914-04-30
US835433A US1501830A (en) 1914-04-30 1914-04-30 Wireless signaling system
FR535489D FR535489A (fr) 1914-04-30 1920-07-22 Perfectionnements aux systèmes de radio-signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US835433A US1501830A (en) 1914-04-30 1914-04-30 Wireless signaling system

Publications (1)

Publication Number Publication Date
US1501830A true US1501830A (en) 1924-07-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
US835433A Expired - Lifetime US1501830A (en) 1914-04-30 1914-04-30 Wireless signaling system

Country Status (3)

Country Link
US (1) US1501830A (fr)
FR (1) FR535489A (fr)
NL (1) NL10046C (fr)

Also Published As

Publication number Publication date
FR535489A (fr) 1922-04-15
NL10046C (fr)

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