US2253189A - Transmission device - Google Patents

Transmission device Download PDF

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Publication number
US2253189A
US2253189A US314506A US31450640A US2253189A US 2253189 A US2253189 A US 2253189A US 314506 A US314506 A US 314506A US 31450640 A US31450640 A US 31450640A US 2253189 A US2253189 A US 2253189A
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US
United States
Prior art keywords
terminal
ground
primary winding
primary
transformer
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
US314506A
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English (en)
Inventor
Eugene B Mechling
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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
Priority to BE442075D priority Critical patent/BE442075A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US314506A priority patent/US2253189A/en
Application granted granted Critical
Publication of US2253189A publication Critical patent/US2253189A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0123—Frequency selective two-port networks comprising distributed impedance elements together with lumped impedance elements

Definitions

  • This invention relates to transmission devices and more particularly to an input transformer for use in vacuum tube amplifier or repeater circuits.
  • An object of the invention is the improvement of transmission over a line which includes an amplifier or arepeater.
  • a more specific object of the invention is the reduction of distortion and other deleterious effects arising from the fiow of currents in the longitudinal circuit of a; transmission line.
  • a feature of the present invention comprises means readily appliedto existing components of the communication circuit whereby the eifects of longitudinal voltages therein are nullified and noise and distortion are prevented.
  • a path to ground through a suitable network which may bea variable condenser, is connected to an external terminal of the primary winding of the input transformer asso-
  • a suitable network which may be a variable condenser
  • Terminal S2 of the secondary winding of input transformer II is connected to ground 21.
  • the windings of input transformer II are in series aiding relationship when connected P1 to P2 to Ps'to P4 to S2 to S1.
  • Signaling currents receivedover incoming line L1 are applied to amplifier l2 through input transformer H and are applied in amplified form through output transformer I3 to outgoing line L2 in the usual manner.
  • Terminal P4 of the primary winding of input transformer H is connected to ground 22 over a path which includes variable condenser 23, this path to ground throughthe variable condenser constituting the corrective means of the ciated with a vacuum tube amplifier or re- V peater; Provision of this path to ground results in setting up in the primary winding 2.
  • current which is effective to establish a voltage rise in the secondary which offsets the voltage drop therein resulting from the action of longitudinal currents passing through the interwinding capacitance of the transformer to ground.
  • Fig. 1 shows a vacuum tube repeater circuit the input transformer of which is provided with corrective means in accordance with features of the present invention
  • Fig. 2 shows a vacuum tube amplifier circuit the input transformer of which likewise is provided with corrective means in accordance with features of the present invention.
  • Condenser 23 should be of relatively small capacity in order that the high frequency signaling currents will not. be affected appreciably by this path to ground.
  • a vacuum tube amplifier circuit including vacuum tube amplifier III, input transformer H2 and-output transformer H3.
  • Amplifier tube III is provided with cathode H4, grid H5 and anode H6.
  • Cathode II 4 is energized by battery III- over a path traced from battery I I1, conductor I2I, cathode H4, resistance I22 to ground 523; when the amplifier is in operation battery I I I also supplies potential to anode I I 6 over a path traced from battery I I1, conductor I2I, cathode H4, through the space charge path of the vacuum tube to anode H6, primary winding I24 of output transformer I I3, choke coil I25 to ground I23.
  • the windings of input transformer II 2 are in series aiding relationship when connected P1 to P2 to S1 to S2. Signaling currents received over incoming line L1 are applied to amplifier tube III through input transformer I I2 and are applied in amplified form through output transformer I I 3 to outgoing line L2 in the usual manner.
  • Wire-to-ground capacitance of the incoming line is represented by condensers MI and I42 and ground I43.
  • Terminal P2 of input transformer I I2 is connected to ground I44 over a path which includes variable condenser I45, switch I46 and contact I41, this path to ground through the variable condenser constituting the corrective means of the embodiment of the invention illustrated in Fig. 2.
  • Condenser I45 should be of relatively small capacity in order that the high frequency signaling currents will not be affected appreciably by this path to ground.
  • the vacuum tube circuit may be subjected both to longitudinal voltages of the nature discussed above in reference to Fig. 1 and noise current of the nature discussed in reference to Fig. 2.
  • switch I46 (Fig. 2) may be operated to contact I55 whereupon condenser I45 will obtain ground through battery H1.
  • the windings of input transformer H2 should be rearranged to be in series aiding relationship when connected P1 to- P2 to S2 to'S1.
  • An input transformer for coupling a line to a vacuum tube repeater having a primary winding and a secondary winding, said primary winding having a firstexternal terminal and a second external terminal, said secondary winding having a first external terminal corresponding to said first terminal of the primary winding and a second external terminal corresponding to said second terminal of the primary winding, said windings being in series-aiding relationship when connected from said first terminal of the primary to said second terminal of the primary to said second terminal of the secondary to said first terminal of the secondary, a connection to ground for an element of the vacuum tube repeater and said second terminal of the secondary winding and a connection to ground through a capacitance for said second terminal of said primary, said last-mentioned connection to groundbeing independent of said first-mentioned connection to ground.
  • An input transformer for coupling a line to a vacuum tube repeater having a primary winding and a secondary winding, said primary winding having a first external terminal and a second external terminal, said secondary winding having a first external terminal corresponding to said first terminal of the primary winding and a second external terminal corresponding to said second terminal of the primary winding, said windings being in series-aiding relationship when connected from said first terminal of the primary to said second terminal of the primary to said second terminal of the secondary to said first terminal of the secondary, a connection to ground for an element of the vacuum tube repeater and said second terminal of the secondary winding and a variable condenser, one terminal of said variable condenser being connected to ground independently of said connection to ground for the repeater element and said second terminal of the secondary winding and the other terminal of said variablecondenser being connected to said second terminal of the primary winding.
  • a transformer having a primary winding and a secondary winding, said primary winding having a first external terminal and a second external terminal, said secondary winding having a first external terminal corresponding to said first terminal of the primary winding and a second external terminal corresponding to said second terminal of the primary winding, said windings being in series-aiding relationship when connected from said first terminal of the primary to said second terminal of the primary to said second terminal of the secondary to said first terminal of the secondary, and means for neutralizing the effect on said secondary winding of said longitudinal currents, said means comprising a connection to ground through a network ior said second external terminal of said primary winding, said connection to ground being independent of said secondary winding.
  • a transformer having a primary winding-and a secondary winding, said primary winding having a'first external terminal and a second external terminal, said secondary windinghaving ax first external terminal corresponding'to said first terminal of the primary winding and a second external terminal corresponding to said second terminal of the primary winding, said windings being in series-aiding relationship when connected from said first terminal of the primary to said second terminal of the primary to said second terminal of the secondary to said first terminal of the secondary, and means for neutralizing the efiect on said secondary winding of said longitudinal currents, said means comprising a path to ground through a variable condenser connected to said second external terminal of said primary winding, said path to ground being independent of said secondary winding.
  • a transformer having a primary winding, a secondary winding and an inherent interwinding capacitance, said interwinding capacitance resulting in passage of longitudinal currents from the primary winding to the secondary winding thereby causing a voltage drop in the secondary winding, means for establishing an independent flow of longitudinal currents through the primary winding to ground effective through transformer action to establish a voltage rise in the secondary of a magnitude and phase angle ,sufiicient to offset said voltage drop therein.
  • a transformer having a primary winding and a secondary winding, one of said windings being subjected to the passage of noise currents therethrough resulting in an impedance drop therein, means for establishing an independent flow of noise currents through the other of said windings to ground resulting in an impedance drop therein, the magnitude of said last-mentioned impedance drop being substantially the same as that of the first-mentioned impedance drop and its direction being opposite to that of the first-mentioned impedance drop.
  • a transformer having a primary winding and a secondary winding, said secondary winding being subjected to the passage therethrough of longitudinal currents resulting in an impedance drop therein, means for establishing an independent fiow of longitudinal currents through said primary winding to ground resulting in an impedance drop therein, the magnitude of said last-mentioned impedance drop being substantially the same as that of the first-mentioned impedance drop and its direction being opposite to that of the first-mentioned impedance drop.
  • a transformer having a primary winding, a secondary winding and an inherent interwinding capacitance, said interwinding capacitance resulting in passage of noise currents from one of said windings to the other, a first external terminal and a second external terminal for said primary winding, a first external terminal for said secondary winding corresponding to said first external terminal of said primary, a second external terminal for said secondary winding corresponding to said second terminal of said primary, and means for neutralizing the effect on one of said windings of passage of noise currents through the other of said windings, said means comprising a path to ground through a variable condenser connected to said second terminal or said primary winding, said windings being arranged to be in seriesconnected from said first terminal of said primary to said second terminal of said primary to said first terminal of said secondary to said second terminal of said secondary when said noise currents first occur insaidsecondary winding.

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  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US314506A 1940-01-18 1940-01-18 Transmission device Expired - Lifetime US2253189A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE442075D BE442075A (en(2012)) 1940-01-18
US314506A US2253189A (en) 1940-01-18 1940-01-18 Transmission device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US314506A US2253189A (en) 1940-01-18 1940-01-18 Transmission device

Publications (1)

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US2253189A true US2253189A (en) 1941-08-19

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US314506A Expired - Lifetime US2253189A (en) 1940-01-18 1940-01-18 Transmission device

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BE (1) BE442075A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406265A (en) * 1964-12-14 1968-10-15 Bell Telephone Labor Inc Repeater with power separation filters and with neutralization networks connected to a common terminal of signal and power channels
US3731234A (en) * 1971-12-27 1973-05-01 Bell Telephone Labor Inc Combined voice frequency transmission and dc signaling circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3406265A (en) * 1964-12-14 1968-10-15 Bell Telephone Labor Inc Repeater with power separation filters and with neutralization networks connected to a common terminal of signal and power channels
US3731234A (en) * 1971-12-27 1973-05-01 Bell Telephone Labor Inc Combined voice frequency transmission and dc signaling circuit

Also Published As

Publication number Publication date
BE442075A (en(2012))

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