GB145869A - Improvements in or relating to telephonic repeaters - Google Patents

Improvements in or relating to telephonic repeaters

Info

Publication number
GB145869A
GB145869A GB8163/19A GB816319A GB145869A GB 145869 A GB145869 A GB 145869A GB 8163/19 A GB8163/19 A GB 8163/19A GB 816319 A GB816319 A GB 816319A GB 145869 A GB145869 A GB 145869A
Authority
GB
United Kingdom
Prior art keywords
transformer
windings
line
repeaters
limbs
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
Application number
GB8163/19A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB8163/19A priority Critical patent/GB145869A/en
Priority to US338861A priority patent/US1429634A/en
Publication of GB145869A publication Critical patent/GB145869A/en
Priority to FR528916A priority patent/FR528916A/en
Expired legal-status Critical Current

Links

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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/36—Repeater circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

145,869. Robinson, C., and Chamney, R. M. April 1, 1919. Telephonic repeaters; phantomcircuit systems.-In telephonic repeaters of the kind in which a transformer has two sets of line windings and also additional windings connected respectively to the input and output circuits of an amplifier, the transformer is so designed that the amplified current in the output windings does not produce a flux in the core of the input winding. The transformer A, Fig. 1, has three limbs, of which the outer ones carry the line windings B, B<1>, and the central limb C carries the input winding connected to the grid circuit of the valve amplifier D, the plate circuit of which is connected to windings E, E<1> on the outer limbs. Speech currents over either line act through the coil C on the grid circuit, the plate current producing magnified effects in both line circuits, but equal and opposite effects upon the coil C and input circuit. Two such repeaters may be cross-connected so that the magnified current from the amplifier fed by one transformer is supplied to the other transformer, and one of the line windings of each transformer is connected to an artificial line. The invention is also applicable to the repeaters described in Specifications 131,113 and 131,114; and to phantomcircuit working. The transformer is formed of a number of E-shaped stampings of two kinds arranged alternately so as to form a core which is continuous with the exception of two narrow air-gaps H, Fig. 8, in the outer limbs of the core. The one kind of stamping has all its limbs of the same length and long enough to reach from one side of the core to the other; the other kind is made with two body parts, each having two short outer limbs and a central limb which is integral with the other. The stampings are clamped by bolts between wood blocks, and the whole enclosed in a sheet-iron case. An additional winding may be provided on the transformer to listenin at the repeater station.
GB8163/19A 1919-04-01 1919-04-01 Improvements in or relating to telephonic repeaters Expired GB145869A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB8163/19A GB145869A (en) 1919-04-01 1919-04-01 Improvements in or relating to telephonic repeaters
US338861A US1429634A (en) 1919-04-01 1919-11-18 Telephonic repeater
FR528916A FR528916A (en) 1919-04-01 1920-12-22 Improvements to telephone translators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8163/19A GB145869A (en) 1919-04-01 1919-04-01 Improvements in or relating to telephonic repeaters
US338861A US1429634A (en) 1919-04-01 1919-11-18 Telephonic repeater

Publications (1)

Publication Number Publication Date
GB145869A true GB145869A (en) 1920-07-02

Family

ID=26241989

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8163/19A Expired GB145869A (en) 1919-04-01 1919-04-01 Improvements in or relating to telephonic repeaters

Country Status (3)

Country Link
US (1) US1429634A (en)
FR (1) FR528916A (en)
GB (1) GB145869A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR881084A (en) * 1941-04-09 1943-04-14 Philips Nv Low frequency amplifier assembly
US2895019A (en) * 1954-02-26 1959-07-14 Fairchild Camera Instr Co Single-tube amplifier with transformer output

Also Published As

Publication number Publication date
US1429634A (en) 1922-09-19
FR528916A (en) 1921-11-21

Similar Documents

Publication Publication Date Title
GB958175A (en) Improvements in or relating to negative impedance circuits
GB148952A (en) Improvements in inductances
GB145869A (en) Improvements in or relating to telephonic repeaters
GB617642A (en) Improvements in or relating to electrical transformers with regulating choke coils
GB829307A (en) A negative impedance amplifier with separate input and output particularly for telephone systems
GB129659A (en) Improvements in or relating to Audion or Lamp Relay or Amplifying Apparatus.
US1442130A (en) Telephone system
GB279967A (en) Improvements in or relating to windings for transformers
US1600274A (en) Telephone-transmission circuits
SU91598A2 (en) Differential System for Duplex Telephone Amplifiers
GB222850A (en)
GB542864A (en) Improvements in and relating to transformers
GB735228A (en) Improvements in or relating to laminated cores for electric transformers, inductances and the like
GB388183A (en) Improvements in and relating to electric transformers
GB317423A (en) Improvements in or relating to electric signalling systems
GB857915A (en) Improvements in or relating to laminated electromagnetic cores
GB131114A (en) Improvements in Telephone Repeater Systems.
GB252128A (en) Improvements in thermionic valve amplifier circuits
GB291014A (en) Improvements relating to high frequency signal amplification systems
GB204708A (en) Improvements in telephone repeater systems
GB190378A (en) Improvements in or relating to electrical transformers
GB191512434A (en) Improvement in Loaded Telephone Line System.
GB615044A (en) Improvements in and relating to electric induction apparatus
GB592031A (en) Electric coupling circuit
GB149466A (en) Improvements in and relating to the use of electron discharge devices in signalling systems