US1762744A - Retardation coil for composite sets - Google Patents

Retardation coil for composite sets Download PDF

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Publication number
US1762744A
US1762744A US230219A US23021927A US1762744A US 1762744 A US1762744 A US 1762744A US 230219 A US230219 A US 230219A US 23021927 A US23021927 A US 23021927A US 1762744 A US1762744 A US 1762744A
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United States
Prior art keywords
coils
telegraph
coil
signals
windings
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
US230219A
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English (en)
Inventor
Ernest L Schwartz
Jr Albert J Williams
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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 BE354197D priority Critical patent/BE354197A/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US230219A priority patent/US1762744A/en
Priority to FR660640D priority patent/FR660640A/fr
Application granted granted Critical
Publication of US1762744A publication Critical patent/US1762744A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data

Definitions

  • This invention relates to composite sets used in conjunction with superposing telegraph channels and telephone channels upon the same line circuits and especially to retardation coils utilized in connection with composite sets.
  • Some means must be provided in a composite set for directing telephone and telegraph signals into their respective channels.
  • Such means may comprise a condenserin the telephone circuit for separating the telegraph signals from the telephone .lines while an impedance which is high to voice frequencies and which readily passes the telegraph signals may be provided in the telegraph circuits to prevent the voice currents from reaching the telegraph instrument.
  • the impedance thus provided is known as a retardation coil.
  • One object of this invention is to maintain theimpedance of both sides of the telephone line forming one branch of the phantomcircuit balanced, when telegraph instruments are associated with both sides of the line through composite sets.
  • a related object of the invention is to eliminate cross-fire between two telegraph instruments which are connected to a telegraph line through the same composite set.
  • Another object is to eliminate the coupling between coils having a common core and still maintain the ratio which the .impedances of the coils bear to each other constant for different frequency and current.
  • a feature-of the invention resides in a retardation coil system comprising two coils which have the same flux paths and in which the windings of the coils are arranged so that a voltage individual to either of the coils will not induce any voltage in its associated coil, but wherein an inductance change in one will create a corresponding change in the inductance of the other.
  • Fig. 1 shows one half of a phantom circuit having telegraph sounders associated therewith which are connected to a telephone circuit by the means of the invention.
  • Fig. 2 shows the invention used to bypass telegraph signals around a voice frequency repeater.
  • a composite set C is shown associating two telegraph instruments 1 and 2 which may either be senders or receivers with different sides of telephone lines 3 and 4 forming one branch of a phantom circuit.
  • a complete phantom circuit is not shown since circuits of this type are well known in the art.
  • Such a circuit is shown in the U. S. patent to J. Mills, No. 1,351,863, granted September 7, 1920, if it be considered that the repeater therein shown be replaced by telephone terminal sets.
  • the other side of the phantom circuit may be identical with that shown.
  • the lead 5 from the phantom repeating coil (not shown) is connected at the midpoint 6 of one winding of the repeating coil 7. This connection must always be at the electrical midpoint of the line comprising wires 3 and 4 to prevent cross-talk.
  • the telegraph instruments 1 and 2 are connected to the line wires 3 and 4 through the coils comprising the windings 9 and 10 in series and windings 11 and 12 in series respectively, which together form the retardation coil system 8.
  • the condensers 13 and 14 and the coils 9, 10 and 11, 12 in series therewith, provide a high impedance to the passage of voice frequency currents while each coil readily permits the passage of the telegraph signaling current to the sounders 1 and 2.
  • Two cores 15 and 16 are each wound with equal portions of each coil.
  • the three windings 9, ,11, and 12 are poled in the same direction while the winding 10 is poled direction. 5
  • a similar retardation coil 8 is provided to drain the charges accumulated in the condensers-19 and 20 from the telegraph signals.
  • FIG. 2 shows the manner in which the telephone lines aremaintained balanced where the telegraph circuits bridge the telephone repeater.
  • a two-way repeater for amplifying telephone signals is shown comprising the west to east repeater-WE, the east to west repeater EW and hybrid coils and 31 of well known type for separating the oppositely directedspeech 'signals..
  • coil system 32 is provided around the repeater for thetelegraph. signals which are excluded from the repeater circuit'bythe condensers 33, 38 34 and 34 and the retardation coil systems 35 and 36, which furnish a. pathto ground for any of the tele raph charges which might collect on the aforementioned condensers.
  • the retardation "coil system '32 in turn precludes any possibility of the voice signals being shunted around the re peater.
  • the coil 32 is in all respects similar to that described in Fig 1 andprovides for balancing both sidesof a telegraph; line regardless of the telegraph signa ls, in either side of the line. i f
  • a transmission circuit means for simultaneously superposing speech signals and telegraph signals on said circuit, and means for separating said signals, said means comprising a retardation coil system having a plurality of cores with a plurality ioo of coils disposed thereon, one of said cores 7 having a portion of each "of said coils piosed thereon, sa1d cores prov1d1ng common.
  • a retardation coil system having two coils and two cores, half of each of said coils being disposed on each of said cores, the windings ofone of said cores being in the Same direction, and the windings of the other of said cores being in opposite directions.
  • a composite set for directing the signals into their respective channels said composite set comprising a retardation coil system having a coil associated with each of said telegraph instruments, said coils having flux paths wholly in common and poled so as to prevent mutual coupling therebetween.
  • a composite set for directing the signals into their respective channels, said composite set comprising two coils serially bridged across said line circuit, each of said coils having windings disposed equally on a pair of cores such that the flux paths of the coils are common, said windings being poled so that the voltage induced in the windings of one coil due to a voltage impressed upon the other coil is negligible, said coils also being adapted so that a change in inductance of one coil results in a corresponding change in inductance of the other.
  • means for simultaneously superposing voice signals and telegraph signals on said circuit and means comprising a retardation coil system for separating said signals, said system comprising a plurality of coils having common flux linkage and portions of their windings poled so as to practically eliminate mutual coupling between any of the coils.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US230219A 1927-11-01 1927-11-01 Retardation coil for composite sets Expired - Lifetime US1762744A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BE354197D BE354197A (enrdf_load_stackoverflow) 1927-11-01
US230219A US1762744A (en) 1927-11-01 1927-11-01 Retardation coil for composite sets
FR660640D FR660640A (fr) 1927-11-01 1928-09-19 Bobines de retardation pour systèmes électriques composés, tels que des systèmes téléphoniques et télégraphiques combinés

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US230219A US1762744A (en) 1927-11-01 1927-11-01 Retardation coil for composite sets

Publications (1)

Publication Number Publication Date
US1762744A true US1762744A (en) 1930-06-10

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ID=22864369

Family Applications (1)

Application Number Title Priority Date Filing Date
US230219A Expired - Lifetime US1762744A (en) 1927-11-01 1927-11-01 Retardation coil for composite sets

Country Status (3)

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US (1) US1762744A (enrdf_load_stackoverflow)
BE (1) BE354197A (enrdf_load_stackoverflow)
FR (1) FR660640A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
FR660640A (fr) 1929-07-13
BE354197A (enrdf_load_stackoverflow)

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