US2215774A - Combined wired radio and space radio receiving system - Google Patents

Combined wired radio and space radio receiving system Download PDF

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Publication number
US2215774A
US2215774A US260489A US26048939A US2215774A US 2215774 A US2215774 A US 2215774A US 260489 A US260489 A US 260489A US 26048939 A US26048939 A US 26048939A US 2215774 A US2215774 A US 2215774A
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US
United States
Prior art keywords
radio
circuits
receiving system
coils
space
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
US260489A
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English (en)
Inventor
Andreatta Alfons
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Application granted granted Critical
Publication of US2215774A publication Critical patent/US2215774A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves

Definitions

  • the invention relates to an attachment for connecting radio receiving apparatus to the line conductors of a wired radio system or alternatively to a space radiofrequency energy collecting system.
  • the transmissions are carried out ordinarily on several fixed carrier waves, preferably on three or four carrier waves.
  • circuit according to the present invention may be arranged as explained in the following in connection with the drawing wherein the single figure discloses a preferred embodiment.
  • D1, D2 are the connection terminals for the broadcast wire line.
  • the apparatus contains three oscillating circuits L1-C1, L2C2 and L3--C3 which are tuned to these carrier frequencies, whereby C1, C2, C3 are fixed condensers.
  • the coils L1, L2, L3 are preferably higlnfrequency iron coils whose self inductance can be set for the desired value by moving the iron core.
  • the three oscillating circuits are coupled to the broadcast wire network across the coils S1 to S6 whereby the coils S1 to S6 are placed in series such that each oscillatory circuit is coupled always across two respective coils which are symmetrical to the wire net and to the ground point of the coil circuit.
  • the coils L1, L2, L3 of the oscillating circuits have tappings 131,132 and B3 which are connected to a switch U1.
  • the switch U1 is'grounded across a potentiometer P whose tapping is connected across a switch U2 to the input E1 of the radio receiver.
  • the switch U1 affords the selective connection of one of the three oscillating circuits L1-C1, L2C2 and L3Cs with the input terminal 121-122 to the receiver.
  • the switch U2 affords switching to broadcast reception by means of the antenna A.
  • the circuit shown inside the rectangle drawn in dash lines may serve with equal advantage as input circuit for wire broadcast receivers, or for the connection of measuring instruments or control apparatus to the broadcast wire net.
  • the center of the coil arrangement S1 to S6 may be grounded as shown in the drawing so that disturbances appearing symmetrically on the two broadcastwires D1 and D2 can be suppressed to a great extent.
  • This coil arrangement has the further advantage that it is possible to obtain a favorable matching or an excessive matching of the apparatus with the broadcast wire net without the necessity of using special preliminary coils which 2: as such would represent a loss in energy.
  • the setting of the attached apparatus for the various wire broadcast waves is done simply by setting the switch U1 which may, if desired, be designed as a press bar.
  • the attachment device according to the invention distinguishes itself by the fact that owing to the absence of a variable condenser it requires comparatively little space.
  • a further advantage on account of the absence of a variable condenser is seen in that the tuning of the apparatus can be rendered independent of temperature influences to a wide degree, because the fixed condensers C1, C2, C3 can be rendered greatly independent of the temperature without difficulties for instance by suitable choice of the dielectric, and the iron core coils to be employed can likewise be rendered insensitive to the temperature to a wide degree.
  • a radio receiving system comprising wire line conductors for conveying carrier frequency energy, a plurality of oscillation circuits each resonant to a different carrier frequency coupled to said conductors, low potential points of said circuits being connected together and to ground, high potential points of said circuits each connected to a terminal switch contact, a switch contact arm cooperatively related to said contacts,
  • a load impedance connected between the contact arm and ground, said contact arm adapted to selectively connect the load impedance to one of the oscillation circuits, a connection from the load impedance to a terminal contact, a space radio frequency energy collecting system connected to an additional contact, a receiver of carrier frequency energy, and a switch contact arm adapted to selectively connect said receiver to one or the other of the two last mentioned terminal contacts.
  • a radio receiving system defined in claim 1 wherein the oscillation circuits each comprise a high frequency coil provided with an adjustable iron core and a shunt fixed condenser.
  • a radio receiving system comprising a balanced transmission line for conveying carrier frequency energy, an equal number of coils serially connected between each line and ground, an equal number of oscillation circuits each resonant to a different carrier frequency coupled to a pair of said line coils which are symmetrically disposed with respect to ground, low potential points of said circuits being connected together and to ground, high potential points of said circuits each connected to a terminal switch contact, a switch contact arm cooperatively related to said contacts, a load impedance connected between the contact arm and ground, said contact arm adapted to selectively connect the load impedance to one of the oscillation circuits, a connection from the load impedance to a terminal contact, a space radio frequency energy collecting system connected to an additional contact, a receiver of carrier frequency energy, and a switch contact arm adapted to selectively connect said receiver to one or the other of the two last mentioned terminal contacts.
  • a radio receiving system comprising a balanced transmission line for conveying carrier frequency energy, an equal number of coils serially connected between each line and ground, an equal number of oscillation circuits each resonant to a different carrier frequency coupled to a pair of said coils which are symmetrically disposed with respect to ground, low potential points of said circuits being connected together and to ground, intermediate points on the inductances of said circuits each connected to a terminal switch contact, a switch contact arm cooperatively related to said contacts, a potentiometer resistance connected between the contact arm

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
US260489A 1938-08-08 1939-03-08 Combined wired radio and space radio receiving system Expired - Lifetime US2215774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2215774X 1938-08-08

Publications (1)

Publication Number Publication Date
US2215774A true US2215774A (en) 1940-09-24

Family

ID=7990548

Family Applications (1)

Application Number Title Priority Date Filing Date
US260489A Expired - Lifetime US2215774A (en) 1938-08-08 1939-03-08 Combined wired radio and space radio receiving system

Country Status (2)

Country Link
US (1) US2215774A (enrdf_load_stackoverflow)
BE (1) BE435888A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2601467A (en) * 1948-08-31 1952-06-24 Rca Corp Triode mixer construction
US2687514A (en) * 1948-08-27 1954-08-24 Rca Corp Two-band tuning network

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2687514A (en) * 1948-08-27 1954-08-24 Rca Corp Two-band tuning network
US2601467A (en) * 1948-08-31 1952-06-24 Rca Corp Triode mixer construction

Also Published As

Publication number Publication date
BE435888A (enrdf_load_stackoverflow)

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