US1501735A - Wireless signaling system - Google Patents

Wireless signaling system Download PDF

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Publication number
US1501735A
US1501735A US32367A US3236715A US1501735A US 1501735 A US1501735 A US 1501735A US 32367 A US32367 A US 32367A US 3236715 A US3236715 A US 3236715A US 1501735 A US1501735 A US 1501735A
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US
United States
Prior art keywords
grid
cathode
antenna
potential
anode
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
US32367A
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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 DENDAT299312D priority Critical patent/DE299312C/de
Priority to NL7569D priority patent/NL7569C/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US32367A priority patent/US1501735A/en
Priority to FR527469A priority patent/FR527469A/fr
Application granted granted Critical
Publication of US1501735A publication Critical patent/US1501735A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • My present invention relates to wireless signaling systems and more especially to the wireless transmission of speech or other sound waves, such, for example, as those produced by musical instruments.
  • the object of my invention is to overcome this difficulty by providing an organization whichwill produce continuous waves which are capable of radiating large amounts of energy-and which have a large variation in amplitude in accordance with the signals to be transmitted and at the sametime provide a system which is easy of adjustment and which is simple and efficient in its operation.
  • FIG. 1 illustrates diagrammatically one way of carrying my invention into effect and Fig. 2 ShOWS'B. modification thereof.
  • the antenna 1 is grounded as usual. nected thereto a source of high frequency oscillations which in this case consists of a high frequency alternator 2. This may be inductively connected to sthe antenna by means of a transformer 3, or may be connected directly thereto if desired.- An inductance 4 which may be varied to tune the It has conantenna circuit to the desired frequency may be placed in serles with the antenna. In some cases it may be desirable to connect the source of energy to the antenna by loosely v coupling the primary'of the transformer 3' to this inductance.
  • the 'cathode 8 is of filamentary form, preferably of tungsten, andis provided with current for heating it to incandescence by the secondary, 10 of the transformer 11 which may be supplied with a low frequency alternating current from the mains 12.
  • the temperature of the cathode may be adjusted by means of the variable resistance 13 in the primary circuit of the transformer.
  • the electron discharge device in the present case is one which is adapted for use with high potentials and in order to adapt it to such use it is necessary that the envelope containing the electrodes should be eX-. .hausted to such a high degree that when high potentials are impressed upon the electrodes the flow of current between the elec trodes is "not accompanied by any visible manifestation of gas ionization. When connected in this way to the antenna and when the grid the flow of current will decrease.
  • the grid potential be varied in accordance wth potential variations produced by sound. waves the amount of energy radiated by the antenna may be varied accordingly.
  • I have indicated in the present case an ordinary telephone transmitter; 14 provided with the usual battery 15 consistin of a few cells and preferably connecte to grid9 through the transformer 16 as indicated, one terminal of the transformer being connected directly to the grid while the other is connected to the middle point of the secondary 10 of the transformer 11 as indicated.
  • the current flowing through relay 6 so that about half of the energy of the source 2 is normally diverted from the antenna circuit. This may be done by impressing an extra potential on the grid 9 in addition to that produced by the trans; former 16.
  • This extra potentia'l may be derived from the battery 17 and by varying the potential of battery 17 the normal current through relay 6 may be adjusted to the desired value.
  • both thepositive and negative half waves of the alternating current produced in the secondary of transformer 16 are effective in varying the amount of energy diverted from the antenna circuit.
  • con enser 18 may be inserted in shunt to this battery.
  • any suitable amplifying means may be employed to secure larger potential variations.
  • the anode 7 is made up of one or more plates of considerable area and the 9 consists of a number of turns of e wire wound on a supporting framework and located in parallel relation to the anode plate or plates;
  • the cathode located in a plane paralanode.
  • the distance be- 8 is also preferabl lel to the grid and noon-res tween.
  • these members is preferably small and as a result there is an appreciable capacity between them. It will be seen that with the arrangement indicated the anode 7 is alternately positive; and negative with respect to the cathode and that as a result the grid 9 will have inducedthereon by electrostatic induction positiv andnegativecharges.
  • a tuned circuit comprising a condenser 19 and a variable inductance 20 between the grid 9 and vcathode 8. If this circuit is tuned to the frequency of the source 2 it will offer a low impedance to the high frequency charges induced on the grid and in so far as these induced charges are concerned will have the same effect as a short circuit between grid and cathode. Hence the grid and cathode willnormally be at substantially the same potential except for the comparatively small difference of potential produced 'by battery 17.
  • the condenser 19 should preferably be of small capacity so as to offer a high impedance to the comparatively low frequency current produced by the sound waves.
  • connection between thecathode and grid of said relay which offers a low impedance to hi h frequency current but offers high impe ance to current of the frequency employed for varying the grid potential .to transmlt signals whereby large high frequency potential differences between grid and cathode are prevented.
  • means for diverting a variable amount of energy from said antenna comprising an electron discharge relay having a cat ode, an anode and a grid, direct electrical con nections between said cathode and said anode andpoints in the antenna circuit between which there is a large difference of potential and a connection between the cathode and grid of said relay which offers a low impedance to high frequency current whereby large high frequency potential difi'erand grid are prevented.
  • a h frequency energy connected to said antenna means for diverting a variable amount of energy from said antenna.
  • an electron discharge relay having a cathode, an anode and a grid, electrical connections between said cathode and said anode and.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmitters (AREA)
US32367A 1915-06-05 1915-06-05 Wireless signaling system Expired - Lifetime US1501735A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DENDAT299312D DE299312C (enrdf_load_stackoverflow) 1915-06-05
NL7569D NL7569C (enrdf_load_stackoverflow) 1915-06-05
US32367A US1501735A (en) 1915-06-05 1915-06-05 Wireless signaling system
FR527469A FR527469A (fr) 1915-06-05 1920-07-22 Perfectionnements aux systèmes de radio-signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32367A US1501735A (en) 1915-06-05 1915-06-05 Wireless signaling system

Publications (1)

Publication Number Publication Date
US1501735A true US1501735A (en) 1924-07-15

Family

ID=21864581

Family Applications (1)

Application Number Title Priority Date Filing Date
US32367A Expired - Lifetime US1501735A (en) 1915-06-05 1915-06-05 Wireless signaling system

Country Status (4)

Country Link
US (1) US1501735A (enrdf_load_stackoverflow)
DE (1) DE299312C (enrdf_load_stackoverflow)
FR (1) FR527469A (enrdf_load_stackoverflow)
NL (1) NL7569C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL7569C (enrdf_load_stackoverflow)
DE299312C (enrdf_load_stackoverflow)
FR527469A (fr) 1921-10-26

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