US1819596A - Wireless transmitter - Google Patents

Wireless transmitter Download PDF

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Publication number
US1819596A
US1819596A US61556A US6155625A US1819596A US 1819596 A US1819596 A US 1819596A US 61556 A US61556 A US 61556A US 6155625 A US6155625 A US 6155625A US 1819596 A US1819596 A US 1819596A
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Prior art keywords
source
resistance
potential
amplifier
electrode
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US61556A
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English (en)
Inventor
Davis Norman Eustace
Ditcham William Theodore
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RCA Corp
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RCA Corp
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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

  • the present invention relates toan improved method and means for signaling by means of vacuum tube transmitters, and is particularly applicable to such transmitters when large. power is employed and when it is required to transmit signals at high speed.
  • t is a further object of thisinvention to provide an adjustable means for controlling the amplitude of employed oscillations in a transmitting circuit in which high voltages are used in the transmitting device.
  • FIG. 1 is a diagrammatic view of the circuits and triodes arranged according to the preferred form of the present invention.
  • Fig. 2 shows a modification of the inventi-on shown inliig. 1.
  • Like letters and like characters are used throughout the specification and drawings to describe like parts of the circuits and apparatus.
  • Vacuum tube transmitters of high power are usually operated according to the socalled independent drive principle, that is, the main oscillatory power is. generated by means of ai number of vacuum tubes or tri odes, the grids of which are excited from a lowpower vacuum tube (generally termed the independent drive).
  • the independent drive is supplied from the same source of power, but more commonly it is supplied from aseparate source.
  • a resistance is inserted in the lead from the high voltage generator to the intermediate and in Great Britain October 13, 1924. Renewed 18, 1931.
  • a vacuum tube or a number of vacuum tubes hereinafter called the absorber, is connected in such a manner as to be in series with the resistance and across. the source of high voltage, and means are providedfor applying to the grid of the absorber either a positive or a negative potential as desired.
  • Fig. 1 of the draw ings, 1) represents an independent drive, source .of high frequency oscillations, generator of high frequency, energy, or oscillator circuit coupled to the grid circuit of an intermediate amplifier or electroirdischarge device V1, the plate circuit of which is coupled to the grid circuit ,ofthe final amplifier or. electron discharge device V2.
  • A is an aerial which is energized by induction from the plate circuit of the amplifier, V2.
  • G is a generator supplying the plate potentials of the amplifiers V1 andV2, the latter directly, and the former through a resistanceRL;
  • an absorber comprising tube V3, batteries B1 and B2, resistance R2 and modulating means in the form of switch K, which may conveniently be the usual type of telegraph key, arranged and connected as shown so that operation of the said switch K will apply modulating potentials to the rid, or in other words, will change the potential of the grid of the tube V3 from positive to negative, or vice versa, as will be more fully explained below.
  • B3 is a battery connected in the grid lead of the main amplifier V2, so as to apply a desired degree of negative bias in V2.
  • This fixed negative bias is so chosen that when the absorber is rendered conductive and the oscillations of the intermediate amplifier are thereby reduced to zero, the anode current of the main tube will cease, that is, the tube is normally biased to cut off, as is usual in operating power amplifiers.
  • any required fraction of the full direct current load may be taken from the high voltage source and used up in the resistance during the time the absorber grid is positive, at which time the main amplifier takes no direct current, thus preventing voltage surges and variations in the direct current supply circuits when signaling.
  • the switch is opened at K and due to the battery B2, thegrid is positively charged and there is a considerable flow of current through the resistance R1, which in turn causes a substantial potential drop across this resistance and consequently a lower plate voltage in the tube V1.
  • the action of the tube Vl as an amplifier is materially reduced and, in fact, may be reduced to zero.
  • an amplifier having input and output electrodes, means for impressing oscillations on the input electrodes, a circuit connecting the output electrodes and including a resistance and a current source serially connected, a variable impedance connected acrosssaid source and said resistance, and telegraphic keying means for rendering said impedance either high or low, whereby when said impedance is low the voltage drop in said resistance is high and the voltage across said output electrodes is substantially reduced.
  • an amplifier having input and output electrodes, means for impressing oscillations on the input electrodes, a circuit connecting the output electrodes and including a resistance and a current source serially connected, an electron discharge device having its output circuit connected across said source and said resistance, a source of relatively positive potential, a source of relatively negative potential, and keying means for connecting either of said sources to a control electrode of the electron discharge device in order to lie lit;
  • a transmitter comprising a master oscillator, first and Second electron emission tube amplifiers, a common source of direct anode potential for both of said amplifiers, a fixed impedance connected between the source and the tube anodeof one of said amplifiers and a modulating circuit of variable impedance connected in shunt with the source and fixed impedance for varying the anode potential applied to one of the amplifiers and means for simultaneously and appropriately varying the anode current supplied to the other amplifier.
  • a transmitter comprising a master oscillator, an intermediate electron emission tube amplifier stage, apower amplifier stage, a common source of direct anode potential for both of said amplifier stages, a fixed impedance connected between the source and the tube anode of the intermediate amplifier stage, a modulator tube having its anode circuit in shunt with the source and fixed impedance, and modulating means for vary ing the potential of the control electrode of the modulator tube in order to vary the anode potential applied to the intermediate amplifier stage and means to simultaneously and appropriately vary the anode current supplied to the power amplifier stage.
  • a transmitter comprising a master oscillator, an intermediate electron emission tube amplifier stage, a power amplifier stage, means to negatively bias the power amplifier stage to cutoff, a common source of direct anode potential for both oi said amplifier stages, a fixed impedanceconnected between the source and the tube anode of the intermediate amplifier stage, a modulator tube having its anode circuit connected in shunt with the source and fixed impedance, a source of relatively positive potential, a source of relatively negative potential, and a key for impressing either the-positive or negative potential on the control electrode of the modulator tube according as the'key isopen or closed means controlled thereby for "decreasing the anode potential of the intermediate amplifier during key' open periods, and at the same'time to absorb the direct anode'cu-rrent which normally flows through'the power amplifier stage during the key closed periods;
  • an electron discharge device having an electron emitting cathode, a "grid, and another electrode, a-resistanceconnected atone end to said electrode and at another point to a potential terminal, an impedance coupled to said resistance, and means for varying the value of said impedance whereby the current flowing through said potential'terminal and resistance is varied thereby varying by virtue said amplifier comprising an evacuated conof the potential fall across said resistance, the potential on the electrode to which said resistance is connected.
  • electron discharge device having an electron trode of said first mentioned electron discharge device is varied.
  • an electron discharge device having within an hermetically sealed envelope an electron emitting cathode, a grid, and another electrode maintained at a relatively higher potential than said grid and cathode;
  • a resistance connected at one point to said electrode and at another point to a source of substantially unidirectional potential, an impedance associated with said resistance, a source of relatively high frequency energy coupled to said electron discharge device; and means for varying the value of said impedance in predetermined fashion whereby the current flowing through said resistance from said source'of substantially unidirectional potential is varied, thereby varying by virtue of the fall of potential acrosssaid resistance, the potential on the electrode to which said resistance is connected.
  • an electron discharge device having within an hermetically sealed envelope an electron emitting cathode, a grid and another electrode maintained at a resistance whereby the potential on said elecrelatively higher potential than said grid and cathode; a resistance connected at one point to said electrode and at another point to a source of substantially unidirectional;
  • tainer having therein an electron emitting cathode, a control electrode, and another elec trode maintained ata potential relatively higher than the other electrodes of said amplifier; and, a connection from said source of substantially unidirectional potential to an electrode of said amplifier for suitably polarizing said last mentioned electrode.
  • an electron discharge device having an hermetically sealed container wherein are contained an electron emitting cathode, a grid, and another electrode maintained at a substantially unidirectional potential higher than said grid and cathode; a resistance connected at one point to said electrode and at another point to a source of substantially unidirectional potential, an impedance comprising an electron discharge device associated'with said source of potential and resistance; and, means for varying in predetermined fashion the current flow through said last mentioned electron discharge device and thereby the current flowing through said resistance whereby the potential on said electrode of said first mentioned electron discharge device is varied.
  • an electron discharge device having an hermetically sealed container wherein are contained an electron emitting cathode, a grid,-and another electrode maintained at a substantially unidirectional potential higher than said gridand cathode; a resistance connected at one point to said electrode and at another point to a source of substantially unidirectional potential, an impedance comprising an electron discharge device associated with said source of potential and resistance; means for varying in predetermined fashion the current flow through said last mentioned electron discharge device and thereby the current 'fiowing through said resistance whereby the potential on said electrode of said first mentioned electron discharge device is varied; a source of high frequency oscillatory electrical energy coupled to the input side of said first mentioned electron discharge device; an amplifier comprising an evacuated container having therein a cathode a grid, and another electrode, coupled to the output side of said first mentioned electron discharge device in order to amplify the output thereof; a connection from said source of
  • a source of high frequency electrical oscillations comprising: an electron discharge device having input and output circuits, the input circuit of which is coupled to said source; an electron discharge device amplifier coupled to the output circuit of said first mentioned electron discharge device, said amplifier having an output circuit, a source of substantially unidirectional potential supplying potential to an electrode of said first mentioned electron discharge device; a resistance between said source and electrode; modulating means connected across said source and said resistance whereby the potential on said electrode is varied upon actuation of said modulating means; and a connection from said source to an electrode of said amplifier for polarizing the electrode so connected.
  • an amplifier having input electrodes and another electrode; means for impressing high frequency undulatory electrical energy on the input electrodes, a circuit connecting said other electrode of said device and one of the input electrodes thereof comprising a resistance and a unidirectional current source serially connected; and, modulating means associated with said resistance for varying the current flow therein and thereby the potential applied to said other electrode to which said resistance is connected.
  • an electron discharge device comprising an evacuated container having therein input electrodes and another electrode maintained ata higher positive potential than any one of said input electrodes, means for subjecting said input electrodes to high frequency electrical oscillations, a circuit connecting said electrode maintained at a higher positive potential and one of said input electrodes including a resistance and a current source serially connected, another electron discharge device having its output circuit associated with said source and said resistance, a source of modulating potentials, and means for. varying the current flow through said resistance in accordance with said modulating potentials whereby the flow of current through the resistance is varied thereby varying the potential applied to said electrode maintained at a relatively high positive potential.
  • an electron discharge device comprising an hermetically sealed container wherein are contained a cathode, and a plurality of cold electrodes; an output circuit for said device; an input circuit for said device, means for subjecting a pair of electrodes of said devices to high frequency undulatory electrical potentials, and means for modulating the electrical potentials to which said electrodes are subjected comprising a source of substantially unidirectional electrical potential, a resistance in series therewith and in series with an electrode of said electron discharge device; and means for varying the current flow through said resistance in predetermined fashion, whereby the potential on the electrode to which said resistance is connected is varied in accordance with the predetermined variations in current flow through said resistance.
  • an electron discharge device comprising an hermetically sealed container having therein a cathode and a plurality of cold electrodes; a circuit connected across said cathode and one of said cold electrodes, a circuit connected across said cathode and another cold electrode, said cathode and one of said cold electrodes being subjected to high frequency potentials whereby high frequency energy appears in one of said clrcuits; and, means for producing modulation in the high frequency energy appearing in one of said circuits, comprising a resistance and a source of substantially unidirectional potential connected in series with one of said cold electrodes and an electron discharge device associated with said resistance and source to produce in predetermined fashion changes in current flow through said resistance whereby the potential on said electrode connected in series with said resistance and source of potential is varied thereby producing modulation in high frequency currents appearing in said circuit.
  • a transmitting arrangement comprising a source of high frequency currents, first and second electron discharge devices coupled thereto, a common source of direct potential for an electrode in each of said electron discharge devices, a fixed impedance connected between the source and an electrode of oneof said devices and a modulating-circuit of variable impedance associated with the source and fixed impedance for varying the potential applied to the electrode of one of said devices connected with said source and impedance.
  • a transmitting arrangement comprising a source of high frequency currents, first and second I coupled thereto, a common source of direct anode potential for both of said devices, an impedance connected between the source and the anode of one of said devices, a modulating circuit of variable impedance connected in shunt with the source and said impedance for varying the anode potential applied to, one of the devices; and means for polariz ing the other of said devices whereby in the absence of high frequency currents in the output circuit of said one of said devices, the unidirectional current fiow through said other device is reduced.
  • a source of high frequency potential In a system utilizing propagated electro-magnetic Waves derived from the How of signal modulated high frequency undulatory electrical currents, a source of high frequency potential, first and second electron emission tube amplifiers, a common source of direct anode potential for both of said amplifiers, animpedance connected between the source and the tube anode of one of said amplifiers, and, a modulating circuit of variable impedance connected in shunt with the source and impedance for varying the potential applied to one of said. amplifiers.
  • a transmitting arrangement comprising a source of high frequency potentials, first and second electron discharge device amplifiers, a common source of positive potential for an electrode in each of said amplifiers, a resistance connect-ed be twcenthe source and an electrode-of one of said amplifiers, and, a modulating circuit of variable impedance connected across the source and resistancefor varying the potential applied to the electrode to which said resistance is connected.
  • a master oscillator for generating high frequency oscillations
  • an amplifier coupled to said oscillator for amplifying the oscillations generated thereby, said amplifier comprising an hermetically sealed container wherein are contained an electron emitting cathode and a plurality of cold electrodes, an output circuit coupled to output electrodes of said amplifier; a vacuum tube having within an evacuated container an anode, a cathode and a grid, a resistance and a source of potential serially connected between said anode and cathode, means coupled to the grid and cathode of said vacuum tube for varying the current flow through said resistance, and, a connection from said resistance to one of the cold electrodes of said amplifier, for varying the high frequency oscillatory energy appearing in the output circuit of said amplifier.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Particle Accelerators (AREA)
  • Domestic Plumbing Installations (AREA)
US61556A 1924-10-13 1925-10-09 Wireless transmitter Expired - Lifetime US1819596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB24262/24A GB245829A (en) 1924-10-13 1924-10-13 Improvements in wireless transmitters

Publications (1)

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US1819596A true US1819596A (en) 1931-08-18

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US61556A Expired - Lifetime US1819596A (en) 1924-10-13 1925-10-09 Wireless transmitter

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US (1) US1819596A (online.php)
FR (1) FR599942A (online.php)
GB (1) GB245829A (online.php)
NL (1) NL17655C (online.php)

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FR599942A (fr) 1926-01-25
NL17655C (online.php)
GB245829A (en) 1926-01-13

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