US1475164A - Signal-transmitting system - Google Patents

Signal-transmitting system Download PDF

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Publication number
US1475164A
US1475164A US567029A US56702922A US1475164A US 1475164 A US1475164 A US 1475164A US 567029 A US567029 A US 567029A US 56702922 A US56702922 A US 56702922A US 1475164 A US1475164 A US 1475164A
Authority
US
United States
Prior art keywords
current
magnetron
oscillations
circuit
magnetic field
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
US567029A
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English (en)
Inventor
Walter R G Baker
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 GB2468820A priority Critical patent/GB169889A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US567029A priority patent/US1475164A/en
Priority to GB15050/23A priority patent/GB199038A/en
Priority to FR567167D priority patent/FR567167A/fr
Application granted granted Critical
Publication of US1475164A publication Critical patent/US1475164A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/18—Tubes with a single discharge path having magnetic control means; having both magnetic and electrostatic control means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Definitions

  • he present invention relates to means for transmitting telegraphic signals by high frequency currents generated by means of a vacuum device in which an electron current is controlled by means of a magnetic field.
  • l5 In carrying my invention into efiect I employ devices known as magnetrons, such as are fully described in an article on The magnetron by Albert W. Hull, published in the Journal of the American Institute of Electrical Engineers, September, 1921,
  • the object of my invention is to provide a simple and eflicient means for controlling the generation and transmission of high frequency' currents for telegraphic signaling.
  • magnetrons 1 and 2 each of which is preferably of tubular form and contains a filamentary cathode 3 and an anode 4: of cylindrical form surrounding the cathode.
  • a source of alternating current for heating the cathodes is provided by a transformer 5, the cathodes being connected parallel to the terminals of the secondary of this transformer.
  • An external circuit between the cathodes 3 and anodes 4 includes a source of direct current 6 and inductance 7, a tuning condenser 8 in shunt to the inductance 7 and magnetizing coils 9 surrounding the magnetrons 1 and 2.
  • the current which flows between cathode 3 and anode 4: through these coils 9 produces a constant polarizing magnetic field in the space between the electrodes which is in a direction parallel to the axis of the tubes, or at right angles to the electrostatic field between the electrodes. Coils 9 and source 5 are so proportioned that this constant magnetic field will have a predetermined desired value.
  • the inductance 7 is coupled to an inductance 10 in series with the antenna 11 and coils 12, which are also in series with the antenna, surround the magnetrons 1 and 2.
  • the coils 12 produce a second magnetic field in the magnetrons, which is superimposed upon the constant magnetic field produced by the coils 9.
  • I provide additional coils 14 around the magnetrons in the arrangement shown in Fig. 1 to supply the coils with current throu h a telegraph key 15 from a source 16.
  • the field produced in this way may be comparatively weak, but sufficient to stop the roduction of oscillations without entirely lnterrupting the current in the plate circuit.
  • the field produced in this way should be made strong enough to entirely interrupt the current in the plate circuit.
  • windings 17 around the magnetrons are employed which are in series with the windings 9. These windings are so proportioned that normally the magnetizing field produced will be so greatas to prevent oscillations from being produced.
  • windings 17 are short circuited and the magnetic field is thereby reduced to such an extent that oscillations will be produced and supplied to the antenna as long as the key 18 is closed.
  • a transmitting circuit which is supplied with current from said oscillating circuit and which also includes a winding for producing a magnetic field for controlling current through said magnetron and causing the production of oscillations and means for producing a supplemental field of sufiicient value tointerru t the production of oscillations in accor ance with telegraphic signals, and cause the current through said magnetron to fall to substantially zero.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Microwave Tubes (AREA)
US567029A 1920-08-25 1922-06-09 Signal-transmitting system Expired - Lifetime US1475164A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB2468820A GB169889A (en) 1920-08-25 1920-08-25 Improvements in and relating to vacuum tube devices especially such devices in which an electron current is controlled by a magnetic field
US567029A US1475164A (en) 1922-06-09 1922-06-09 Signal-transmitting system
GB15050/23A GB199038A (enrdf_load_stackoverflow) 1922-06-09 1923-06-08
FR567167D FR567167A (fr) 1922-06-09 1923-06-08 Système émetteur de signaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US567029A US1475164A (en) 1922-06-09 1922-06-09 Signal-transmitting system

Publications (1)

Publication Number Publication Date
US1475164A true US1475164A (en) 1923-11-27

Family

ID=24265440

Family Applications (1)

Application Number Title Priority Date Filing Date
US567029A Expired - Lifetime US1475164A (en) 1920-08-25 1922-06-09 Signal-transmitting system

Country Status (3)

Country Link
US (1) US1475164A (enrdf_load_stackoverflow)
FR (1) FR567167A (enrdf_load_stackoverflow)
GB (1) GB199038A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB199038A (enrdf_load_stackoverflow) 1923-09-13
FR567167A (fr) 1924-02-26

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