GB240034A - Improvements in signalling systems - Google Patents

Improvements in signalling systems

Info

Publication number
GB240034A
GB240034A GB2933624A GB2933624A GB240034A GB 240034 A GB240034 A GB 240034A GB 2933624 A GB2933624 A GB 2933624A GB 2933624 A GB2933624 A GB 2933624A GB 240034 A GB240034 A GB 240034A
Authority
GB
United Kingdom
Prior art keywords
cable
impedance
ohms
western electric
thermionic
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
GB2933624A
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
Western Electric Co 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 US734580A priority Critical patent/US1654328A/en
Application filed by Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to GB2933624A priority patent/GB240034A/en
Publication of GB240034A publication Critical patent/GB240034A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

240,034. Western Electric Co., Ltd., (Western Electric Co., Inc.). Dec. 6, 1924. Thermionic receivers for line telegraphy. - A submarine cable is terminated at the receiving end in a high impedance so that the voltage component of the signal predominates. The reduction in signal response due to an artificial line in duplex systems or to a balancing circuit is thus eliminated. The Figure shows a cable 8 with a balancing circuit consisting of a length 10 of cable, a resistance 11 and earth 13 simulating the impedance of the cable. The cable terminates in a high impedance 15 and is connected thereto by a condenser 20 of low impedance to signalling frequencies. The impedance 15 is connected across the grid and filament of a thermionic valve amplifier A which reconverts the voltage into current for operating a siphon recorder 16. The impedance 15 is from 3,000 to 6,000 ohms for a cable with an impedance of 400 ohms. A switch 9 enables either the receiving circuit or a transmitter T to be connected to the cable.
GB2933624A 1924-08-28 1924-12-06 Improvements in signalling systems Expired GB240034A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US734580A US1654328A (en) 1924-08-28 1924-08-28 Submarine signaling
GB2933624A GB240034A (en) 1924-12-06 1924-12-06 Improvements in signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2933624A GB240034A (en) 1924-12-06 1924-12-06 Improvements in signalling systems

Publications (1)

Publication Number Publication Date
GB240034A true GB240034A (en) 1925-09-24

Family

ID=10289932

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2933624A Expired GB240034A (en) 1924-08-28 1924-12-06 Improvements in signalling systems

Country Status (1)

Country Link
GB (1) GB240034A (en)

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