US1501831A - Wireless signaling system - Google Patents

Wireless signaling system Download PDF

Info

Publication number
US1501831A
US1501831A US71190A US7119016A US1501831A US 1501831 A US1501831 A US 1501831A US 71190 A US71190 A US 71190A US 7119016 A US7119016 A US 7119016A US 1501831 A US1501831 A US 1501831A
Authority
US
United States
Prior art keywords
current
antenna
cathode
anode
high frequency
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
US71190A
Other languages
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 DENDAT308204D priority Critical patent/DE308204C/de
Application filed by General Electric Co filed Critical General Electric Co
Priority to US71190A priority patent/US1501831A/en
Priority to FR520855A priority patent/FR520855A/fr
Application granted granted Critical
Publication of US1501831A publication Critical patent/US1501831A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C1/00—Amplitude modulation

Definitions

  • the object of my invention is to overcome the disadvantages which have been I present in previous systems for transmitting signals and provide a system in which the energy which must pass through the telephone transmitter is small in comparison with the total energy supplied to the antenna.
  • A.further object of my invention is to provide a s stem in which the energy radiated from t e antenna varies inversely as the amplitude of the current changes in the telephone transmitter.
  • I supply an antenna with high frequency energy and coupleto an inductance in the antenna means for diverting a small portion of the energy from the antenna to an ener consuming device or relay.
  • I vary 1; e amount of energy thus diverted and consumed in accordance with variations in the current in a telephone transmitter.
  • the power factor of the antenna is increased in proportion to the amount of energy diverted and the antenna current is causedto decrease.
  • Control currentzi Control wattszei Total watts I R+ed Total volt ampereszeI Total power factor P Substitute in this equation then PR 'i P T I P El PR i I Substitute in this equation E P TX E1 PR 1X71 E -'L X p for I O t r X when I is maximum E I n Ratio between '11 for I min E E R Radiation I max X R X power factor Since the power factor of the antenna current is usually very low the current which must be carried by the energy consuming device will be small in comparison With the antenna current. If the voltage applied to the energy consuming device is greater than that across the inductance to which it is coupled the current the-rein will be correspondingly less.
  • the energy consuming device or relay which I prefer to employ is of the pliotron or electron discharge type compris- 'ing a cathode provided with means for heating to incandescenc-e, an anode and a current controllin member enclosed in a receptacle which 15 exhausted to such a degree that the passage of current from cathode to anode is not accompanied by any visible manifestation of gas ionization, such as blue glow. with any voltage which may-be aplied thereto.
  • the amount of current flowlng through such a device varies with the potential of the current controlling member and this potential in turn is varied in accordance with variations in the telephone current.
  • Fig. 1 shows diagrammatically the preferred Way in which my invention may be carried into efi'ect
  • Figs. 2 and 3 show modi' fications thereof
  • Fig. 4 shows a modified form of energy consuming device which may be employed in carrying my invention into efiect.
  • the antenna 1 is supplied with high frequency current by means of the alternator 2 which is coupled thereto by the transfornn er 3.
  • the antenna is provided with the usual variable inductance 4 for tuning.
  • An oscillation transformer 5 comprising inductan'ce 6 and condensers 7 so adjusted that it is resonant to the frequency of the antenna has a few of its turns 8 coupled to the in ductance 4.
  • the cathode 12 of this relay is provided with a battery 13 for heating it to incandescent-e to cause it to emit electrons and ground connections 14: and -15 are provided between condensers 7 and to the cathode 12.
  • the cathode is surrounded by a grid 16 which is preferably composed of fine Wire wound upon a supporting framework.
  • the potential of this grid is varied in accordance with variations in the current in transformer 17 produced by the telephone transmitter 18 and local battery 19. With relays of this type there is usually a certain definite grid potential at which the greatest sensitiveness of the relay occurs. The value of this potential depends largely upon the design of the particular relay used and may easily be determined by experiment. In order to provide the potential desired a battery 20 of the proper strength and polarity is connected to the grid 16.
  • the battery 20 is preferably so adjusted that under normal conditions there will be but little current through relay 11.- If then, assuming that the grid is negative, a telephone current is superimposed upon the grid circuit the grid 16 will be made less negative or more positive during the half cycles in which the telephone current opposes the battery current and of course, the
  • Relays of the pliotron type are especially suitable for my pur ose since they are adapted for use with big potentials'and low currents.
  • the oscillation transformer is a convenient means for obtaining the high po.- tential suitable for the operation of the pliotron, but an ordinary air core transformer 21 with a large number of secondary turns loosely coupled to the antenna inductance as shown in Fig. 2 may also be used.
  • the relay 22 which is indicated has only one anode so'that energy is diverted from the antenna only during every other half cycle of the high frequency current.
  • the power factor of the antenna current however is varied in the same amnner as in the arrangement shown in Fig. 1.
  • the alternator 2 is shown connected in series with the antenna although it may.
  • Fig. 3 I have shown another modification which difi'ers from the one shown in Fig. 2 in that the energy diverting means is closely coupled to the tunlng inductance 4.
  • the arrangements shown in Figs. 2 and 3 are useful only when the inductance 4 necessary for tuning forms a substantial portion of the total inductance in the antenna circuit and when this inductance has an effective impedance which is several times greater than the effective resistance of the antenna.
  • the form of my invention shown in Fig. 1 is especially suitable when the inductance necessary for tuning the antenna is but a small part of the total inductance.
  • the inductance 4 may be made much larger than is necessary for tuning but this inductance will in effect he neutralized by the 0011- densers 7 and the final effect in so far as varying the effective resistance of the antenna will be the sameas though the inductance 6 of the oscillation transformer were connected directly in series with the antenna.
  • Fig. 4 I have shown a form of electron discharge device which may be substituted for devices 11 and 22 as shown in the other figures and in which there will be a flow of current during every half cycle. This is accomplished by providing two electron emitting cathodes 23 and 24 which are provided with means for heating to incandescence and by interposing between them two grids 25. These grids will preferably be so connected to the secondary of the transformer 26, the primary of which is supplied by the telephone current, that both will be positive at the same time and both will be negative at the same time.
  • Means for transmitting signals comprising a source of high frequency alternating'- current, a resonant circuit associated therewith, an electron discharge relay comprising an electron emitting cathode, an anode and a current controlling member as sociated with said resonant circuit to divert energy therefrom, and means for varying the potential of the current controlling mern. her to vary the effective resistance of the circuit.
  • Means for transmitting signals comprising a source of high frequency alternating current, a resonant circuit associated therewith, a relay comprising electrodes and a current controlling member enclosed in an evacuated envelope, associated with said resonant circuit to divert energy therefrom, and means for varying the potential of the current controlling member to vary the effective resistance of the resonant circuit.
  • the combination in a signaling system of a transmitting circuit and means for supplying modulated high frequency oscillations to said transmitting circuit comprising an electron discharge device having an electron emitting cathode and an anode, means for supplying high frequency current to a circuit connected between said cathode and anode, and means for establishing an electric field in the space between cathode and anode which is capable of varying the conductivity of the space between cathode and anode in accordance with low frequency signals.
  • an electron discharge device having an electron emitting cathode and an anode, means for supplying higlr' frequency current to a circuit connected between said cathode and anode, andmeans for establishing an electric field in the space between cathode and anode which is capable of varying the current flowing between cathode and anode in accordance with low frequency signals.
  • the method of controlling high frequency current for signaling which consists in impressing a high frequency current upon a transmitting circuit and u on a circuit between the cathode and an e of an electron discharge device, and producing in the space between the cathode and anode an electric field which isrcapable of varying the conductivity of the space between cathode and anode in accordance with variations in a low frequency signaling current.
  • the method of controlling high frequency current for signaling which consists in impressing a high frequency current upon a transmitting circuit and upon a circuit between the cathode and anode of an electron discharge device, and producing in the space 23.
  • the method of controlling high frequency current for transmitting currents produced by sound waves which consists 1n impressing a high frequency current upon a transmitting circuit and upon a circuit between the cathode and anode of an electron discharge device, and producing in the space between cathode and anode an electric field which is capable of varying the conductivity of the space between cathode and anode in accordance with variations in the currents to be transmitted.
  • the method of controlling high frequency current for signaling which consists in impressing a high frequency current upon a transmitting circuit and upon a circuit between the cathode and anode of an electron discharge device having an electron emitting cathode, an anode and a discharge controlling member, and varying the conductivity of the space between cathode and anode by varying the potential of the discharge controlling member in accordance with low frequency signals.
  • a high frequency signaling system of a transmitting circuit a source of high frequency alternating current connected to said transmitting circuit, means for diverting a portion of the energy of said source from said circuit comprising an electron discharge device having an electron emitting cathode, an anode and a discharge controlling member and having its cathode and anode associated with said circuit, and means for varying the potential of said discharge controlling member in accordance with signals.
  • the method of signaling which consists in impressing a source of high frequency alternating current upon a transmitting circuit and upon the cathode and anode of a relay device having an electron emitting cathode, an anode and a current controlling member, and diverting a variable amount of energy of said source through said relay de vice by varying the potential of the current controlling member.
  • a relay device comprising an electron emitting cathode and an anode enclosed in an evacuated receptacle and capable of operation substantially independent of gas conductivity, a source of high frequency energy connected to said antenna and to said relay device and means for varying the conductivity of said relay device to vary the amplitude of the current waves in said antenna.
  • a thermionic device of the audion type for modulating high frequency oscillations in accordance with low frequency signals said device having an input and an output circuit, said input circuit comprising a heated filament and a control.- ling electrode, means for generating low frequency signals, and means for impressing said low frequency signals upon the input circuit of said device.
  • a thermionic device for modulating said high frequency oscillations in accordance with low frequency signals, said. device comprising an evacuated vessel containing a filament, an auxiliary electrode and a plate element, and means for changing the potential of the auxiliary electrode with respect to the filament in accordance with low frequency signals to be transmitted.
  • a thermionicdevice for modulating said high fr uency oscillations in accordance with low said device comprising an evacuated vessel containing a filament, an auxiliary electrode and a plate element, means for generating low frequency signals, and means for impressing said signals between the filament and the auxiliary electrode.
  • a signaling system comprising an au-- dion having filament, grid and plate electrodes, means for supplying high frequency oscillations to said audion, signaling means associated with said audion, and a circuit connected to said plate and said filament electrodes for leading off from said audion. high frequency oscillations modulated in acoordance with said signal.
  • a signaling system comprising an audion having filament, grid and plate electrodes, means for supplying high frequency oscillations, means for supplying signaling oscillations, means comprising said audion for modulating said high frequency oscillations in accordance with said signaling oscillations, and a circuit connected to said filament and plate electrodes for leading off the modulated oscillations from said audion.
  • a source of high frequency oscillating current a radiating antenna system associated therewith and an auxiliary circuit operatively connected to said antenna system and supplied with energy therefrom, said auxiliary circuit including the cathode and anode of an electron discharge relay having an incandescent cathode, an anode and a grid enclosed in an evacuated receptacle, and means for controlling the current in said auxiliary circuit.
  • a source of high frequency oscillating current a radiating antenna system ascociated therewith and an auxiliary circuit operatively connected to said antenna system and supplied with energy therefrom, said auxiliary circuit including the cathode and anode of an electron discharge relay having an incandescent cathode, an anode and a grid enclosed in an evacuated receptacle and sound actuated means for controlling the current in said auxiliary circuit.
  • auxiliary circuit operatively connected to said antenna system and supplied with energy therefrom, said auxiliary circuit including the cathode and anode of an electron discharge relay having an incandescent cathode, an anode and a grid enclosed in an evacuated receptacle, and means for varying the current through said relay and thereby varying the amplitude of the current in the antenna.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmitters (AREA)
US71190A 1916-01-10 1916-01-10 Wireless signaling system Expired - Lifetime US1501831A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DENDAT308204D DE308204C (en(2012)) 1916-01-10
US71190A US1501831A (en) 1916-01-10 1916-01-10 Wireless signaling system
FR520855A FR520855A (fr) 1916-01-10 1920-07-22 Perfectionnements aux systèmes transmetteurs de téléphonie sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71190A US1501831A (en) 1916-01-10 1916-01-10 Wireless signaling system

Publications (1)

Publication Number Publication Date
US1501831A true US1501831A (en) 1924-07-15

Family

ID=22099825

Family Applications (1)

Application Number Title Priority Date Filing Date
US71190A Expired - Lifetime US1501831A (en) 1916-01-10 1916-01-10 Wireless signaling system

Country Status (3)

Country Link
US (1) US1501831A (en(2012))
DE (1) DE308204C (en(2012))
FR (1) FR520855A (en(2012))

Also Published As

Publication number Publication date
FR520855A (fr) 1921-07-02
DE308204C (en(2012))

Similar Documents

Publication Publication Date Title
US1558120A (en) Radio receiving system
US2059219A (en) Slope wave generator
US1501831A (en) Wireless signaling system
US2315658A (en) Negative resistance device
US2079248A (en) Ultra high frequency magnetron discharge tube circuit
US2493091A (en) Frequency modulation system
US2288214A (en) Radio system
US1356763A (en) Oscillation-generator
US2313071A (en) Oscillation generator and modulator
US2074440A (en) Modulator
US2510026A (en) Frequency modulation system for microwave generators
US2407424A (en) Electron capacity and electron capacity modulator
US2042321A (en) Oscillating system
US1385873A (en) Electron-discharge apparatus
US3209262A (en) Single tube transmitter employing coded relaxation-type oscillator
US1796071A (en) High-frequency repeater
US2121158A (en) Oscillation generator
US2243216A (en) Frequency modulation
US1485156A (en) System of distribution
US2009069A (en) Oscillation generation
US1935342A (en) Modulation system
US2030125A (en) Frequency modulation apparatus
US2258254A (en) Electrical discharge device
US1442147A (en) Production of modulated high-frequency oscillations
US1349729A (en) Modulating and transmitting system