US1906501A - Arrangement for valve transmitters connected with a load-equalizing tube - Google Patents

Arrangement for valve transmitters connected with a load-equalizing tube Download PDF

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Publication number
US1906501A
US1906501A US312074A US31207428A US1906501A US 1906501 A US1906501 A US 1906501A US 312074 A US312074 A US 312074A US 31207428 A US31207428 A US 31207428A US 1906501 A US1906501 A US 1906501A
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United States
Prior art keywords
load
tube
discharge device
resistance
grid
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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
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US312074A
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English (en)
Inventor
Urtel Rudolf
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Telefunken AG
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Telefunken AG
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Publication date
Application filed by Telefunken AG filed Critical Telefunken AG
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Publication of US1906501A publication Critical patent/US1906501A/en
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    • 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

  • valve transmitters whose working potential is supplied from a network, with load-compensating circuit means.
  • the purpose of the latter is to cause the potential sourceto operate upon a separate circuit during the spacing periods to prevent load fluctuations of the supply when signalling.
  • load-compensating circuit means For it will ,be understood that such variations of the load are liable to occasion overvoltages, and this might endanger the operation of the transmitter equipment, not to mention this further circumstance that the working potential variations associated with-such load fluctuations often affect the frequency of the transmitter wave. Such frequency alterations will arise when the transmitter valve connected with the supply line is operated in what is known as a self-excitation scheme.
  • the load compensating circuits customarily provided in practice to preclude load fluctuations consist usually of one ormore dis charge tubes which are connected in parallel with the same network, and whose internal resistance is controlled in dependence upon the keying in such a way that during the keying intermissions or spaces the decrease in the load of the network due to the interruption of the transmitter wave is compensated by an increase in the load due to the load-compensator tube.
  • the control of the load-compensator tube is to be effected automatically by the variation of the grid direct current in the transmitter tube.
  • the said load-compensator tube consists of a triode
  • the controlling action is produced by varying the grid biasing potential of this load-compensating tube in accordance with the variations in the direct current in the grid circuit of the transmitter valve.
  • Proper control of the load on the source by the variations in the biasing potential results from thefact that the grid of the load-compensating tube is given a more negative biasing potential when the transmitter valve is oscillating, and that the said bias is less negative or more positive whenever the oscillations cease.
  • B the load-compensator tube.
  • These two tubes are connected with the supply source net work terminals/H1 H2. Keying is effected by the aid of key T which interrupts; the supply line to the transmitter tube S.
  • the load-compensating tube B is suitably united with the supply network by way of a re-' sistance R.
  • the grid of the load-compensating tube is connected with a resistance R which is included in the grid circuit of the transmitter valve.
  • an electron discharge tube having an input circuit and an output circuit, a power supply system for supplying energy to said tube, a second electron discharge tube having an input circuit and an output circuit said second mentioned tube being also connected to said power supply system and means common to and both said input circuits for affecting the conductivity of said second mentioned tube in accordance with conditions in said first mentioned tube.
  • an oscillation generator comprising a space discharge device having input and output circuits, a power supply circuit for said space discharge device, a load compensator means, comprising a second space discharge device having input and output circuits, and means common to said mentioned input circuits for aflecting said second named space discharge device in opposite sense toconditions in said first mentioned electron discharge device.
  • an electron discharge device having an input circuit and an output circuit, a power supply system for supplying energy to said device, a
  • variable loading device shunted across said power supply system and means in said in put circuit for controlling said variable loading device in accordance with the load placed upon said power supply system by said electron discharge device in opposite senses whereby the total load on said system remains constant.
  • means for generating high frequency oscillations comprising an electron discharge device having an input circuit and an output circuit, a resistance in said input circuit, a power supply system for said space discharge device, a load compensator means comprising a second electron discharge device having its anode and cathode circuit connected across said power supply system and its grid and cathode circuit connected across said resistance, signal modulating means assooiated with said oscillation generator and means controlled thereby for affecting the conductivity of said second electron discharge device.
  • an electron discharge device having high frequency input and output circuits, a resistance in series with the grid of said device, a condenser across said resistance for preventing the flow of high frequency currents in said resistance, a source of potential connected to other electrodes of said device, a vacuum tube connected across said source, and means connecting said resistance to said vacuum tube whereby the conductivity of said tube is varied in accordance with the unidirectional potential difference across said resistance.
  • an electron discharge device having an anode a cathode and a grid
  • said device having in addition high frequency input and output circuits, a resistance in series with the grid of said device, a relatively large capacity condenser shunting said resistance, a source of potential for supplying anode potential to the anode of said device, a tube having an anode a cathode and a grid connected across said source, said last mentioned. grid being connected to said resistance whereby the conductivity of said tube is varied in accordance with the potential difference across said resistance thereby maintaining the anode potential applied to said electron discharge device substantially constant despite variations in high trequenc load thereon.
  • an electron dis charge device having input and output electrodes and input and output circuits connected therewith, means for connecting the output electrode of said discharge device to a source of energizing current including a key, and means for maintaining a constant load on said source irrespective of the conductivity of said tube as determined by the position of said key
  • a second a discharge device having its anode to cathode impedance connected in parallel with said source, said second discharge device having a control electrode, and means connected with said control electrode and with one of said circuits to apply energy from one of said circuits to said control electrode, the amount of which is determined by the position of said key.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Transmitters (AREA)
US312074A 1927-10-17 1928-10-12 Arrangement for valve transmitters connected with a load-equalizing tube Expired - Lifetime US1906501A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE298959X 1927-10-17

Publications (1)

Publication Number Publication Date
US1906501A true US1906501A (en) 1933-05-02

Family

ID=6091131

Family Applications (1)

Application Number Title Priority Date Filing Date
US312074A Expired - Lifetime US1906501A (en) 1927-10-17 1928-10-12 Arrangement for valve transmitters connected with a load-equalizing tube

Country Status (3)

Country Link
US (1) US1906501A (enrdf_load_html_response)
GB (1) GB298959A (enrdf_load_html_response)
NL (1) NL25713C (enrdf_load_html_response)

Also Published As

Publication number Publication date
NL25713C (enrdf_load_html_response)
GB298959A (en) 1929-08-15

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