US1834279A - Telegraph circuits - Google Patents

Telegraph circuits Download PDF

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Publication number
US1834279A
US1834279A US489997A US48999730A US1834279A US 1834279 A US1834279 A US 1834279A US 489997 A US489997 A US 489997A US 48999730 A US48999730 A US 48999730A US 1834279 A US1834279 A US 1834279A
Authority
US
United States
Prior art keywords
line
auto
relay
current
signalling
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
US489997A
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English (en)
Inventor
Jarvis Frederick William
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.)
Creed and Co Ltd
Original Assignee
Creed and Co Ltd
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 Creed and Co Ltd filed Critical Creed and Co Ltd
Application granted granted Critical
Publication of US1834279A publication Critical patent/US1834279A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/18—Automatic changing of the traffic direction

Definitions

  • the main advantage of this arrangement is as duplexthattheton'gue of the auto relay closes the I dur ng'slgnalhng, It lSJlSllfll tovmsert a shunted capacity at the receiving end of te1e graph .lines to improve the speed of working by minimizing theflefiect of self induction ofthe receiving'app'aratus.
  • the effect of this shunted capaciity in series with the rectifier andthe transmitting relay is to increase the unidirectional holding current in the auto relay during signalling reversals to an extent dependent on' the relative values of the capacity and re sistance and the electrical characteristics of the remainder of the line circuit, -.-
  • the dis tinguishing feature of the invention is that thecontact on; the ,auto relayis now firmly maintained at high signalling speeds,-where-' as previouslythe duration of contact of the tongue with the limiting contactstops was considerably reducedby the: transittime and contact bounce periodwhich increases with the speed of signalling. Further and conse quent. advantages will be apparent such. as
  • the currentrectifier maybe of any convenient form but is preferably of the bridge type in which dry metal oxide rectifier elements are inserted in the armsof the bridge.
  • the accompanying figure shows diagram inatically the connections at an intermediate repeating station in a simplex telegraph circuit according to the present invention.
  • a line 1 from a terminal station isconnected to the armature of an auto switch 2, the normal or back contact of which is. connected through the winding of a. transmittingrelay 3, a shunted capacity 4,
  • the contacts of transmitting relay 3 are connected to a split battery of, whichthe junctionis earthed, and the tongue to the operated contactof auto switch 6, forthe other section 7foftheline.
  • a relay 8 is inserted in the bridge of the rectifier 5 and whenop ⁇ erated closes the circuit through the winding of auto switch 6, which operates on the current from battery 9.
  • the connections for the other section 7 of the line to the second terminal station are similar to those for the first section.
  • Line 7 is normally earthed through the winding of transmitting relay 10, shunted capacity 11 and rectifier 12.
  • Relay 13 in the bridge circuit of rectifier 12 controls auto switch 2 for section 1 of the line, and the tongue of transmitting relay 10' is connected to the operated contact of the auto switch 2 of this section of the line.
  • lV-hen a terminal station, for example the terminal station connected to section 1, deslres totransmit, the switch at that terminal station is turned to send and a spacing current is, therefore, put on the line.
  • relay 8 At the repeat ing station relay 8 thereupon operates and closes the circuit of auto switch 6 which operates and connects the tongue of transmitting relay 3' tothe second section 7 to. the line.
  • the transmitting relay 3 responds to signal"- ling currents over section 1 oi theline-and therelayed signals are retransmitted over the second section 7 to the second terminal eta-- tion.
  • the reversals of signalling currents are-rectified by rectifier 5 and maintains relay 8 in anoperated position, due to the efite'ct of the shunted capacity 4 in series in the line circuit, the holding current through the relay 8 is even increased during periods of signalling compared with the steady spacing current during pauses.
  • a double current telegraph system a, line circuit, switch means actuated to an operated position by signalling currents received over said line, means to rectify said signalling currents to actuate said switch means by unidirectional current and hold said switching means actuated during reception of signals, and a retransmitting relay responsive to signals received over the line circuit to repeat signals into a line controlled by the actuated switching means.
  • a bridge rectifier, a shunted capacity and a winding of a signal retransmitting relay together connected? in series: in each of two'secti'ons of a line, an auto relay connected in the bridge circuit of said rectifier and actuated to an operated position by signalling currents rectified thereby, and. an auto send receive switch controlled by each of said auto relays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Radio Relay Systems (AREA)
US489997A 1930-03-26 1930-10-20 Telegraph circuits Expired - Lifetime US1834279A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9639/30A GB351487A (en) 1930-03-26 1930-03-26 Improvements in telegraph circuits

Publications (1)

Publication Number Publication Date
US1834279A true US1834279A (en) 1931-12-01

Family

ID=9875866

Family Applications (1)

Application Number Title Priority Date Filing Date
US489997A Expired - Lifetime US1834279A (en) 1930-03-26 1930-10-20 Telegraph circuits

Country Status (3)

Country Link
US (1) US1834279A (fr)
FR (1) FR700201A (fr)
GB (1) GB351487A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941034A (en) * 1954-06-28 1960-06-14 Cie Ind Des Telephones Translating device for telegraph system comprising a two-wire line used for both directions of transmission
US3103647A (en) * 1959-07-01 1963-09-10 Bell Telephone Labor Inc Transmitter and receiver signaling circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941034A (en) * 1954-06-28 1960-06-14 Cie Ind Des Telephones Translating device for telegraph system comprising a two-wire line used for both directions of transmission
US3103647A (en) * 1959-07-01 1963-09-10 Bell Telephone Labor Inc Transmitter and receiver signaling circuits

Also Published As

Publication number Publication date
GB351487A (en) 1931-06-26
FR700201A (fr) 1931-02-26

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