US2050598A - Short wave detector system - Google Patents

Short wave detector system Download PDF

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Publication number
US2050598A
US2050598A US2141A US214135A US2050598A US 2050598 A US2050598 A US 2050598A US 2141 A US2141 A US 2141A US 214135 A US214135 A US 214135A US 2050598 A US2050598 A US 2050598A
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United States
Prior art keywords
conductors
antenna
filaments
electrodes
circuit
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Expired - Lifetime
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US2141A
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English (en)
Inventor
Rene A Braden
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RCA Corp
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RCA Corp
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Publication date
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Priority to US2141A priority Critical patent/US2050598A/en
Priority to DER95220D priority patent/DE664275C/de
Application granted granted Critical
Publication of US2050598A publication Critical patent/US2050598A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D1/00—Demodulation of amplitude-modulated oscillations
    • H03D1/26—Demodulation of amplitude-modulated oscillations by means of transit-time tubes

Definitions

  • This invention relates to ultra short wave receiving apparatus and has particular reference to means for detecting the received radio frequency energy.
  • an electron tube may be so constructed asto operate efliciently when its grid is maintained at high direct current potential in relation both to the cathode and to the plate.
  • Another object of my invention is to provide apparatus of the class hereinbefore mentioned in which the balancing of impedances in different portions of the system may be greatly facilitated.
  • Another object of my invention is to provide suitable tuning devices in association with a two-wire transmission line whereby an electron discharge tube having two sets of triode electrodes may be operated as the equivalent of two .Barkhausen-Kurz tubes when connected in a push-pull manner.
  • Fig. 2 shows also diagrammatically another Referring to Fig. 1, I- show an electron discharge tube of special construction having an envelope I within which are mounted two cylindrical anodes 3, two grids 5 and two filaments Each. of the triode sets of electrodes may be so constituted as to operate in the manner of a Barkhausen-Kurz tube, that is to say, with a high direct current potential impressed upon the grid and with a small difference of potential between the cathode'and the plate suchras to 6 bias the latter either positively or negatively, according to circumstances.
  • a Barkhausen-Kurz tube that is to say, with a high direct current potential impressed upon the grid and with a small difference of potential between the cathode'and the plate suchras to 6 bias the latter either positively or negatively, according to circumstances.
  • the two plates 3 may be mounted adjacent one another.
  • the plate lead 8 is, therefore, conveniently made 3) common to the two plates.
  • This lead is shown connected to an external circuit which includes an adjustable tap 2! on a potentiometer 23 the voltage drop across which'rnay be derived from a low voltage power supply '25, the latter being if? also connected to the two conductors ill of a Lecher-wire system comprehending in one part thereof the filaments l.
  • the grids 5 are also connected in parallel through a lead 19 to a circuit which includes the primary 9 of a suit- 20 able transformer l i and thence to a tap 13 on a potentiometer i5 across which a high direct current voltage may be impressed from any suitable power supply such as that represented at ll.
  • the secondary of the transformer H may 5 be connected to any desired utilization circuit.
  • Connections between the low voltage power supply and the Lecher-wire system may include a rheostat '29 and two radio frequency chokes 3
  • the conductors 0 27 are preferably disposed quite close to and parallel with one another. As they enter the envelope of the tube, they diverge sufficiently to permit of running the filaments each exactly through the center of its triode system. The filament leads again converge so as to be brought out at the top of the tube into an extension of the Lecher-wire system indicated at 33.
  • a bridging member 35 is adjustably connected across the conductors 33 in such manner that tuning of the circuit may be accomplished.
  • a further means for tuning the circuit is provided by a capacitive bridge including the capacitor 31.
  • the points of connection 39 are also adjustable along the conductors 21.
  • Any suitable antenna system such as a dipole 4
  • High frequency energy collected on the antenna and impressed out of phase upon the filaments 1 may be detected through the well known action of the Barkhausen-Kurz tube elements.
  • the high positive potential which is im- 55 pressed upon the grid produces an oscillatory action upon the electrons which are emitted from the filaments.
  • Those of the electrons which have suflicient velocity to be projected through the mesh of the grid are thereafter retarded so that many of them do not reach the inner wall of the plate but are attracted back again to the grid and to the cathode.
  • the radio frequency energy impressed upon the cathode produces a varying difference of potential between the cathode and the other electrodes such that the direct current component between the grid and the cathode is likewise varied.
  • the plates are caused to operate substantially at grounded radio-frequency potential. Demodulation of the received energy is obtained in the output circuit, which includes the primary 9 of the transformer The detected signal may, therefore, be utilized in any desired manner.
  • Fig. 2 I show a modification of my invention in which the two triode systems though mounted side by side within one envelope are sufficiently separated from one another so that complete independence of one triode from the other may be maintained.
  • the cylindrical plates 45 may be mounted in any suitable manner in accordance with conventional tube design. Within the plates and symmetrically disposed are the usual electrodes including grids 5 and filaments the same as are shown in Fig. 1. In this instance, however, I have shown by way of illustration how the filaments may be connected in parallel instead of in series.
  • the filament potential is here derived from a battery 41, one side of which is grounded and the other side of which is connected to a rheostat 29. From the rheostat direct current is fed to the filaments through a suitable choke 3
  • the Lecher-wire system of which the filal ments are component parts extends transversely across the cylindrical walls of the vacuum tube envelope.
  • is adjustably connected to the wires 21.
  • are arranged to be moved into proper position for tuning the circuit so as to produce loops of radio frequency waves on the filaments 1.
  • the return circuit for the filament heating current is led through a center tap on the bridge member 5
  • the high voltage power supply for the grids may be obtained from the source I1, the two sides of which are connected respectively to the terminals of a potentiometer 5a.
  • This potentiometer has two taps
  • the taps 3a and I31), being independent of one another, may be so adjusted as to impress any desired voltages upon the grids 5 independently of one another.
  • the plate voltages impressed upon the two plates 45 may be adjusted each independently of the other, the taps 2
  • the potentiometer 23a is connected between the positive side of the battery 41 and ground and hence supplies any suitable positive or negative bias with respect to the mean potential of 5 the filaments.
  • Two grounded by-pass condensers 43a and 43b are used in connection with the respective plate circuit leads to provide a balanced push pull anode circuit. These serve the same purposes as that of the capacitor 43 10 indicated in Fig. 1.
  • the secondary of the transformer 53 is connected to any desired utilization circuit.
  • the action of the receiving system for detecting ultra high frequency modulated waves or in- 15 termittent waves is substantially the same whether the diagram of Fig. 2 or that of Fig. 1 is followed.
  • along the Lecher-wire system facilitates the matter of building up radio frequency voltage loops upon the filaments.
  • the impedance matching is further facilitated by the adjustable connections of the antenna system along the Lecher-wire system.
  • a short wave radio receiving system comprising an antenna, a thermionic push-pull detector and a utilization circuit, said detector having all of its electrodes enclosed in one envelope, said electrodes comprising independent 65 cylindrical anodes and each anode having in cooperation therewith an accelerating electrode and an electron emitting cathode, an electric heating source connected with said cathodes, means including independent connections between each of said cathodes and separate portions of said antenna whereby said cathodes are included in said antenna and radio frequency energy may be impressed on said cathodes in out of phase relation, and means including a 7 suitable energy source for so polarizing said electrodes with respect to one another as to cause said system to detect and to utilize theenergy impressed on said antenna.
  • an electron tube comprising a plurality of independent sets of cooperating electrodes each set including a cathode, an anode and an accelerating electrode, a radio energy collecting device, meansincluding a bi-filar transmission line for supplying energy from said collecting device in out of phase relation to the respective cathodes of two of said sets and for causing said sets to operate in a push-pull manner, an output circuit connected to both of said accelerating electrodes jointly, means for supplying operating potentials across said electrodes, means for operating said anodes at substantially a grounded radio-frequency potential, and means for supplying heating energy through said transmission line to said cathodes.
  • a short wave radio receiving system comprising an antenna, a two-conductor transmission line connected to separate portions of said antenna and proportioned to derive energy therefrom which is impressed upon the respective conductors in out of phase relation, an electron discharge tube of the Barkhausen-Kurz type and having two independent sets of electrodes, each set including a cathode, a plate and a grid, the cathode of each set being connected to one of said conductors respectively, means for supplying heating energy through said conductors to said cathodes, an output circuit connected to both of the two accelerating electrodes in common, capacitive coupling means for causing said anodes to be maintained substantially at grounded radio frequency potential, and means including a short circuiting conductor disposed across said conductors at one point and a capacitor disposed thereacross at another point for so tuning the circuit of said antenna, said cathode and said two-conductor transmission line as to establish a voltage loop at substantially the middle of each cathode.
  • a short wave radio receiving system comprising an antenna, a Lecher-wire transmission device connected to said antenna, an electron discharge tube comprising two independent sets of electrodes, each set including a cathode, a plate and a grid, each of said cathodes being serially connected into said transmission device, means for so bridging said transmission device conductively near one end thereof and capacitively near the other end thereof as to produce standing waves of energy derived from said antenna and so that loops of said standing waves are maintained on said cathodes, and means for so polarizing the electrodes of said electron discharge tube with respect to one another that said tube iscaused to function as a detector.
  • a short wave radio receiving system comprising an antenna, a thermionic balanced de tector and a utilization circuit, said detector comprising two sets of electrodes within one envelope, each filament of said electrodes being disposed axially of its set and having lead-in conductors providing circuit connections for the terminals thereof exteriorly of said envelope, a Lecher-wire system connecting said antenna with two of said lead-in conductors, and means including a shorting bar tunably disposed in contact with two others of said lead-in conductors for setting up standing loops of radio waves at points midway of each filament.
  • a short wave radio receiving system comprising in combination, an electric discharge device having a pair of spaced substantially parallel straight-wire filaments, a pair of Lecherwire conductors each including one of said filaments and extending therefrom at opposite ends, filter means for supplying filamentary heating current through said wires, means providing adjustable bridging current paths directly between said conductors on opposite sides of said filaments, at least one of said paths being conducting, and a dipole antenna adjustably connected with said conductors on one side of the filaments.
  • a short wave radio receiving system the combination of a pair of Lecher-wire conductors, each of said conductors including a straight-wire filament, an anode electrode associated with each filament and a grid electrode interposed between each filament and its anode whereby a pair of triodes is provided, means for operating said triodes as an oscillator with relatively high positive grid bias and low anodecathode potential, means providing an adjustable bridging connection between said conductors on opposite sides of said filaments whereby said Lecher-wire system is tunable, and a dipole antenna having portions connected each with one of said conductors at adjacent points on the one side of said filaments.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
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US2141A 1935-01-17 1935-01-17 Short wave detector system Expired - Lifetime US2050598A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US2141A US2050598A (en) 1935-01-17 1935-01-17 Short wave detector system
DER95220D DE664275C (de) 1935-01-17 1936-01-15 Gegentakt-Bremsfeldempfangsschaltung fuer ultrakurze Wellen

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US2141A US2050598A (en) 1935-01-17 1935-01-17 Short wave detector system

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US2050598A true US2050598A (en) 1936-08-11

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DE (1) DE664275C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516990A (en) * 1942-09-14 1950-08-01 Rca Corp Ultra high frequency mixer circuits

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516990A (en) * 1942-09-14 1950-08-01 Rca Corp Ultra high frequency mixer circuits

Also Published As

Publication number Publication date
DE664275C (de) 1938-08-24

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