US2116696A - Thermionic tube compensator for aerials - Google Patents

Thermionic tube compensator for aerials Download PDF

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Publication number
US2116696A
US2116696A US60712A US6071236A US2116696A US 2116696 A US2116696 A US 2116696A US 60712 A US60712 A US 60712A US 6071236 A US6071236 A US 6071236A US 2116696 A US2116696 A US 2116696A
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Prior art keywords
aerial
grid
cathode
elements
valve
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Expired - Lifetime
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US60712A
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English (en)
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Monge Gerard De
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1009—Placing the antenna at a place where the noise level is low and using a noise-free transmission line between the antenna and the receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements

Definitions

  • THERMIONIC TUBE COMPENSATOR FOR AERlALS Filed Jan. 24, 1936 Patented May 10, 1938 UNITED STATES Search PATENT FFICE THERDIIONIC TUBE- COMPENSATOR FOR AERIALS Gerard de Monge, Flostoy, Belgium Application January 24, 1936, Serial No. 60,712 In Belgium January 24, 1935 8 Claims.
  • the invention essentially consists in applying thermionc valve circuits, including, for example, triodes and the like, for the suppression or reduction of interference.
  • Diierent systems have been proposed for screening or shrouding the down-lead of the aerial or to counter-balance the action of this down-lead in order to reduce the eiect of interference.
  • a system of compensation or counter-balance which is eiective with minimum loss of eiciency and without having recourse to any inductive action by using in the first stage of the receiver an ordinary thermionic valve ampliiier circuit arranged in such a way as to be operable at the same time by its grid and by its cathode, whereby one of the collectors, for example the aerial, is connected to the grid, while the other, for example the down-lead compensator, is connecte to the cathode.
  • the cathode must in relation to the return point of the current, for instance the earth, have a high impedance, and, moreover, between the grid and (Cl. Z50-20) earth there should be a resistance of the same magnitude.
  • An appropriate potential can be given to the grid in such a way that the valve is in good working condition irrespective of the potential 1 which will be applied to the cathode from the resistance between this latter and the anode current return point, e. g. the earth.
  • the grid and the cathode resistances can be so regulated or arranged as to give to each branch of reception (the aerial on the one hand and the down-lead compensator on the other) appropriate values for the achievement of the best result.
  • control for the secondary collector or compensator can be regulated to a greater extent than that of the aerial.
  • a simple way of realizing this condition is to make the impedance determining the amplitude of the approaching potentials variable by means of a small condenser operating by its reaction without influencing the potential between the cathode and the grid.
  • the extent of action can be established, either by constant means or by a part of the constant impedance and a variable part, which can operate in a differential sense upon both elements, for example by disposing resistances in the cathode and grid circuits, and in having between these resistances a potentiometer the sliding contact of which can be connected to earth.
  • the means for controlling the impedances can be adjusted but it is preferable that they are aperiodic in order to avoid any trouble which might be caused by resonance.
  • Fig. 1 is a circuit diagram showing the application of the invention to the neutralization of an aerial down-lead
  • Fig. 2 is a circuit diagram representing a modication of the circuit shown in Fig. 1;
  • Fig. 3 is a circuit diagram illustrating yet a further modification.
  • Fig. 1 the aerial l, situated at a considerable height in a region relatively sheltered from .the industrial interference, is connected to the grid G of the valve T. This aerial is also connected to earth through the medium of the rheostat 2.
  • a rheostat 4 similarly allows the amplitude of the gathered potentials to be regulated by varying the resistance between the cathode C and earth.
  • the plate P of the same valve T receives the high tension current by the choke 5 and transmits to the point l, through the condenser 6, the amplified high frequency currents resulting from the variations of the relative potentials between the grid G and the cathode C.
  • valve e. g. a screen-grid, pentode or the like.
  • the circuit represented in Fig. 2 is such that the regulation of the impedances determining the balance of the two operating electrodes can be realized without inuencing the potential given to the grid with reference to the cathode.
  • the grid G and the cathode C are each connected to the earth by fixed resistances 2 and 4 respectively and by the variable condensers 9 and I0 respectively which allow the variation of the total impedance constituting a point of balance of these electrodes as regards high frequency currents without influencing their xed potential.
  • the circuits of the electrodes G and C each contain a xed resistance 2 and 4 respectively and a differential control in the form of a potentiometer Il of which the sliding contact is connected to earth.
  • a triode valve including a cathode element and a grid element, and an effective high-frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, a secondary aerial connected to the other of said elements, and a high frequency impedance between the grid element and the neutral point of the receiving circuit.
  • a triode valve including a cathode element and a grid element, and an effective high-frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, and a secondary aerial connected to the other of said elements, and a high-frequency aperiodic impedance between the grid element and the neutral point of the receiving circuit.
  • a triode valve including a cathode element and a grid element, and an effective high-frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, a secondary aerial connected to the other of said elements, and a highfrequency impedance between the grid element and the neutral point of the receiving circuit, and means for varying said irnpedances.
  • a triode valve including a cathode element and a grid element, and an effective high-frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, and a secondary aerial connected to the other of said elements, means for controlling the degree of action of the secondary aerial on the receiver with a voltage higher than that of the main aerial for compensating not only the interference collected in the zone common to the two aerials but also the interference collected by the part not common to the main aerial.
  • a thermionic tube including a cathode element and a grid element, an effective high-frequency impedance interposed between the cathode element and an earth equivalent point of the receiving circuit, a main aerial connected to one of said elements and a second aerial connected to the other of said elements, and said second aerial extending in a spaced relation along the main aerial.
  • a thermionic tube including a cathode element and a grid element, an effective high frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, a secondary aerial connected to the other of said elements and extending adjacently along the main aerial, and means for controlling the amplitude of high frequency potentials applied to said cathode and grid elements.
  • a thermionic tube including a cathode element and a grid elemreniguan effective high frequency. impedacewint between the cathode element and. a neu mal of the receiving circuit, a mainq aerial coni'ietdI to one of said elements, a secondary aerialwgonnected to the other of saiiu'elements'and exigenci--- ing along a portion of the main aerial in a spaced relation, and independent means fci controlling the amplitude of high' frequency potentials applied to said cathode 4and grid'elen'ientsfMv u 8.
  • a thermionic tube including a cathode element and a grid element, an eifective high frequency impedance interposed between the cathode element and a neutral point of the receiving circuit, a main aerial connected to one of said elements, a secondary aerial connected to the other of said elements and extending in a spaced relation along the main aerial, and means for controlling the amplitude of high frequency potentials applied to said cathode and grid elements comprising variable condensers.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
US60712A 1935-01-24 1936-01-24 Thermionic tube compensator for aerials Expired - Lifetime US2116696A (en)

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BE2116696X 1935-01-24

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US2116696A true US2116696A (en) 1938-05-10

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US60712A Expired - Lifetime US2116696A (en) 1935-01-24 1936-01-24 Thermionic tube compensator for aerials

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US (1) US2116696A (US06368395-20020409-C00036.png)
BE (1) BE407478A (US06368395-20020409-C00036.png)
FR (1) FR801136A (US06368395-20020409-C00036.png)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415810A (en) * 1943-10-22 1947-02-18 Cohen Louis Radio receiving system
US2533803A (en) * 1945-08-13 1950-12-12 Cornell Dubilier Electric Audio controlled limiter
US2646500A (en) * 1947-03-15 1953-07-21 Rca Corp High-frequency tuner
US2657310A (en) * 1950-12-05 1953-10-27 Avco Mfg Corp Antenna coupling network
US3047804A (en) * 1962-07-31 Apparatus for removing spurious signals
US3234547A (en) * 1962-07-10 1966-02-08 Katzin Martin Polarization diversity system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971913C (de) * 1948-10-02 1959-04-16 Elektronik G M B H Deutsche Verfahren und Anordnung zum Abgleich von symmetrisch ausgebildeten Antennenanordnungen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047804A (en) * 1962-07-31 Apparatus for removing spurious signals
US2415810A (en) * 1943-10-22 1947-02-18 Cohen Louis Radio receiving system
US2533803A (en) * 1945-08-13 1950-12-12 Cornell Dubilier Electric Audio controlled limiter
US2646500A (en) * 1947-03-15 1953-07-21 Rca Corp High-frequency tuner
US2657310A (en) * 1950-12-05 1953-10-27 Avco Mfg Corp Antenna coupling network
US3234547A (en) * 1962-07-10 1966-02-08 Katzin Martin Polarization diversity system

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Publication number Publication date
FR801136A (fr) 1936-07-28
BE407478A (US06368395-20020409-C00036.png)

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