US2261327A - Receiving system - Google Patents

Receiving system Download PDF

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Publication number
US2261327A
US2261327A US249353A US24935339A US2261327A US 2261327 A US2261327 A US 2261327A US 249353 A US249353 A US 249353A US 24935339 A US24935339 A US 24935339A US 2261327 A US2261327 A US 2261327A
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United States
Prior art keywords
receiver
cable
inner conductor
capacity
antenna
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Expired - Lifetime
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US249353A
Inventor
Babik Ludwig
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Telefunken AG
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Telefunken AG
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Publication date
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Publication of US2261327A publication Critical patent/US2261327A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H2/00—Networks using elements or techniques not provided for in groups H03H3/00 - H03H21/00
    • H03H2/005—Coupling circuits between transmission lines or antennas and transmitters, receivers or amplifiers
    • H03H2/008—Receiver or amplifier input circuits

Definitions

  • connection cable is dimensioned as regards thickness, length and its dielectric, in such manner that its parallel capacity between the inner conductor and the envelope to be connected to the ground terminal of the receiver is approximately equal to the normal antenna capacity for which the receiver is designed (for instance, about 150-250 mmf.).
  • the advantage of the invention resides in that a receiver designed for ordinary radio reception can also be connected for high frequency wire transmission while obtaining the highest possible efficiency.
  • the potential transmitted through high frequency transmission by wire lies at the upper terminal K1 of the socket D.
  • the lower terminal K2 is grounded.
  • the cable K is used which consists of the metallic envelope M, the inner conductor J and the dielectric L.
  • the inner conductor is brought out from the cable at the end facing the socket D and then connected with a plug S1 inserted into the socket bushing K1.
  • the corresponding end of the envelope M has a wire soldered thereto which is connected with the plug S2.
  • the plug S2 is inserted into the grounded bushing K2 the cable envelope is thereby grounded.
  • the inner conductor is connected to the antenna bushing A across the plug S3, and the envelope is connected with the ground bushing E across the plug S4.
  • the dimensions are such that the capacity between the interior conductor and the outer envelope is 200 mmf.
  • the input circuit of the receiver P is likewise designed for the same capacity which in general is assumed as the mean antenna capacity.
  • the inner conductor is interrupted at the end facing the connection socket, by means of a block condenser of about -50 mmi. placed in the cable and designated by C.
  • This block condenser serves for attaining a loose coupling of the receiver with the voltage source existing between the terminals K1 and K2.
  • the cable part from the wire signal transmitter up to the connection socket D is in general terminated. by an ohmic resistance at the end facing the socket which resistance is ohms and which in case of a close coupling with the input circuit of the receiver would cause a high damping of v the latter.
  • the condenser C prevents this damping.
  • a shielded cable comprising an inner conductor, a condenser connected to said inner conductor and a metallic shield insulated from and surrounding the condenser and the inner conductor, means for connecting the inner conductor between one of the receiver terminals and one of the conductors of the transmission line, and means for connecting the metallic shield of said cable between the other receiver terminal and another conductor of the transmission line, said cable being arranged to have a capacity between its inner conductor and the shield which is approximately equal to said predetermined normal capacity.
  • a radio receiver for connecting the antenna and ground terminals of a radio receiver to a transmission line adapted to have impressed upon it signals desired to be received, said radio receiver being designed for operation with an antenna system having a predetermined normal capacity, a shielded cable having an inner conductor, a condenser connected to said inner conductor and a metallic shield insulated from and surrounding the condenser and the inner conductor, means connecting the inner conductor between the antenna terminal of the receiver and one of the conductors of the transmisison line, and means connecting the metallic shield of said cable between the ground terminal of the receiver and the other conductor of the transmission line, said cable being arranged to have a capacity between its inner conductor and the shield thereof which is of the order of said predetermined normal capacity.

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Description

Nov. 4, 1941. BABIK 2,261,327
RECEIVING SYSTEM Filed Jan. 5, 1959 INVENTOR wow/c; B/K
BY M
ATTORNEY Patented Nov. 4 194i RECEIVING SYSTEM Germany Application January 5, 1939, Serial No. 249,353 In Germany January 8, 1938 2 Claims.
It is already known in a receiver for high frequency transmission across wire to connect the antenna terminal of the receiver through a shielded connection cable with the locally fixed connection terminal for the potential transmitted with high frequency across wire.
In accordance with the present novel feature this connection cable is dimensioned as regards thickness, length and its dielectric, in such manner that its parallel capacity between the inner conductor and the envelope to be connected to the ground terminal of the receiver is approximately equal to the normal antenna capacity for which the receiver is designed (for instance, about 150-250 mmf.).
The advantage of the invention resides in that a receiver designed for ordinary radio reception can also be connected for high frequency wire transmission while obtaining the highest possible efficiency.
An example embodying the novel feature is shown in the accompanying drawing.
The potential transmitted through high frequency transmission by wire lies at the upper terminal K1 of the socket D. The lower terminal K2 is grounded. In order to connect the terminals K1 and K2 with the antenna socket A and the ground bushing E of the receiver P the cable K is used which consists of the metallic envelope M, the inner conductor J and the dielectric L. The inner conductor is brought out from the cable at the end facing the socket D and then connected with a plug S1 inserted into the socket bushing K1. The corresponding end of the envelope M has a wire soldered thereto which is connected with the plug S2. When the plug S2 is inserted into the grounded bushing K2 the cable envelope is thereby grounded. At the otherend of the cable the inner conductor is connected to the antenna bushing A across the plug S3, and the envelope is connected with the ground bushing E across the plug S4. As regards the length and thickness of the cable as well as its dielectric the dimensions are such that the capacity between the interior conductor and the outer envelope is 200 mmf. The input circuit of the receiver P is likewise designed for the same capacity which in general is assumed as the mean antenna capacity.
The inner conductor is interrupted at the end facing the connection socket, by means of a block condenser of about -50 mmi. placed in the cable and designated by C. This block condenser serves for attaining a loose coupling of the receiver with the voltage source existing between the terminals K1 and K2. The cable part from the wire signal transmitter up to the connection socket D is in general terminated. by an ohmic resistance at the end facing the socket which resistance is ohms and which in case of a close coupling with the input circuit of the receiver would cause a high damping of v the latter. The condenser C prevents this damping.
I claim:
1. In an arrangement for connecting the antenna and ground terminals of a radio receiver which is designed for operation with an antenna system having a predetermined normal capacity, to a transmission line which is adapted to have impressed upon it signals desired to be received, a shielded cable comprising an inner conductor, a condenser connected to said inner conductor and a metallic shield insulated from and surrounding the condenser and the inner conductor, means for connecting the inner conductor between one of the receiver terminals and one of the conductors of the transmission line, and means for connecting the metallic shield of said cable between the other receiver terminal and another conductor of the transmission line, said cable being arranged to have a capacity between its inner conductor and the shield which is approximately equal to said predetermined normal capacity.
2. In an arrangement for connecting the antenna and ground terminals of a radio receiver to a transmission line adapted to have impressed upon it signals desired to be received, said radio receiver being designed for operation with an antenna system having a predetermined normal capacity, a shielded cable having an inner conductor, a condenser connected to said inner conductor and a metallic shield insulated from and surrounding the condenser and the inner conductor, means connecting the inner conductor between the antenna terminal of the receiver and one of the conductors of the transmisison line, and means connecting the metallic shield of said cable between the ground terminal of the receiver and the other conductor of the transmission line, said cable being arranged to have a capacity between its inner conductor and the shield thereof which is of the order of said predetermined normal capacity.
LUDWIG BABIK.
US249353A 1938-01-08 1939-01-05 Receiving system Expired - Lifetime US2261327A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2261327X 1938-01-08

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US2261327A true US2261327A (en) 1941-11-04

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US249353A Expired - Lifetime US2261327A (en) 1938-01-08 1939-01-05 Receiving system

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