US2201337A - Circuit arrangement for reducing interference - Google Patents

Circuit arrangement for reducing interference Download PDF

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Publication number
US2201337A
US2201337A US196312A US19631238A US2201337A US 2201337 A US2201337 A US 2201337A US 196312 A US196312 A US 196312A US 19631238 A US19631238 A US 19631238A US 2201337 A US2201337 A US 2201337A
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US
United States
Prior art keywords
cathode
potential
grid
circuit arrangement
reducing interference
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
US196312A
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English (en)
Inventor
Franke Ernst
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.)
Telefunken AG
Original Assignee
Telefunken AG
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
Application filed by Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2201337A publication Critical patent/US2201337A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the stray or interfering potentials picked up by the auxiliary antenna are in phase with those picked up by the downlead of the main antenna, while the latter has an excess of signal energy, it follows that the amplitudes of the potentials fed to the transformer may be so balanced that only the useful or signal potential will arise at the secondary end.
  • tential are separately impressed on distinct electrodes of a multi-electrode tube designed to control the current issuing from the cathode, the said electrodes controlling in push-pull relation the current flowing to a third electrode in the presence of co-phase voltage variation.
  • the iallv of alternating potential which is'occasioned by the current of the said third electrode across a load resistance, is used as the signal voltage.
  • control electrodes are two control grids comprised in a multi-electrode tube between which a third grid is interposed which has a positive biasing poten tial, and whose current intake in the presence of co-phase voltage variation, will therefore be in phase opposition at the two control grids.
  • the present invention offers the advantage that compensation or neutralization is made independent of the frequency.
  • the cathode could be grounded for A. C., in other words, directly heated electron tubes could be employed.
  • a very marked anti-regeneration reverse generation or feedback
  • This scheme would be impracticable in the circuit arrangement hereinbefore mentioned and suggested in the prior art for the reason that in that case there acts across the cathode resistance the compensation potential picked up by the auxiliary antenna and including the strays.
  • FIG. 1 An exemplified embodiment of the invention is illustrated in Fig. 1.
  • the antenna N of Fig. 1 and the auxiliary antenna H are connected by way of the two voltage dividers R1, R2 with the control grids GI, G2 of the tube V.
  • the said voltage dividers are so set that the current of the screen grid S is essentially free from stray components.
  • the plate A, just as the cathode K, could be grounded for RF.
  • the fall of potential occasioned by the screengrid current across the outer resistance R of the screen-grid lead may be taken off at point P and be impressed upon the RF amplifier.
  • a radio receiving. system comprising a vacuum tube having a cathode, a plurality of control grids, a screen grid and an anode, a main aerial connected to one of said control grids, an auxiliary aerial connected to another of said control grids, a source of high positive potential and connections therefrom to both the screen grid and anode, a load resistor included in the screen grid control grids, a source of high positive to cathode circuit, and output connections across said resistor for leading off the tube output.
  • a radio receiving system comprising a vacuum tube having a cathode, a first control grid, a screen grid, a second control grid and an anode arranged in the order named, a main aerial circuit coupled toone of said controlgrids, an auxiliary aerial circuit coupled to the other of said potential and connections therefrom to both the screen grid and anode, and a load resistor included in said connection to the screen grid.
  • a radio receiving system comprising. a vacuum tube having a cathode, a plurality of control grids, a screen grid and an anode, a main aerial circuit including a potentiometer and a variable connection therefrom to one of said control grids, an auxiliary aerial circuit including a potentiometer and a variable connection therefrom to another of said control grids, a source of high positive potential and connections therefrom to both the screen grid and anode, and a load resistor included in the screen grid to cathode circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
US196312A 1937-03-19 1938-03-17 Circuit arrangement for reducing interference Expired - Lifetime US2201337A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202118X 1937-03-19

Publications (1)

Publication Number Publication Date
US2201337A true US2201337A (en) 1940-05-21

Family

ID=5769877

Family Applications (1)

Application Number Title Priority Date Filing Date
US196312A Expired - Lifetime US2201337A (en) 1937-03-19 1938-03-17 Circuit arrangement for reducing interference

Country Status (4)

Country Link
US (1) US2201337A (en)van)
BE (1) BE427038A (en)van)
CH (1) CH202118A (en)van)
NL (1) NL51901C (en)van)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734944A (en) * 1956-02-14 Differential amplifier method of cancelling ripple pick-up
US3047804A (en) * 1962-07-31 Apparatus for removing spurious signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2734944A (en) * 1956-02-14 Differential amplifier method of cancelling ripple pick-up
US3047804A (en) * 1962-07-31 Apparatus for removing spurious signals

Also Published As

Publication number Publication date
BE427038A (en)van)
NL51901C (en)van)
CH202118A (de) 1938-12-31

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