GB842442A - Improvements in means for receiving low frequency signals from submarine cables - Google Patents

Improvements in means for receiving low frequency signals from submarine cables

Info

Publication number
GB842442A
GB842442A GB2702855A GB2702855A GB842442A GB 842442 A GB842442 A GB 842442A GB 2702855 A GB2702855 A GB 2702855A GB 2702855 A GB2702855 A GB 2702855A GB 842442 A GB842442 A GB 842442A
Authority
GB
United Kingdom
Prior art keywords
amplifier
audio
frequency
modulator
signals
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
GB2702855A
Inventor
Kenneth Eric Latimer
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.)
Submarine Cables Ltd
Original Assignee
Submarine Cables 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 Submarine Cables Ltd filed Critical Submarine Cables Ltd
Priority to GB2702855A priority Critical patent/GB842442A/en
Priority to FR1160750D priority patent/FR1160750A/en
Publication of GB842442A publication Critical patent/GB842442A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

842,442. Transmission systems for submarine cables. SUBMARINE CABLES Ltd. Sept. 18, 1956 [Sept. 21, 1955], No. 27028/55. Class 40 (4). A telegraph cable is provided with a submerged repeater and modulator for converting the incoming D.C. telegraph signals into audiofrequency signals for transmission where the water is shallow and the signals are liable to lowfrequency interference due e.g. to atmospherics, power supply systems or other telegraphic cables converging in that area. As shown, the submerged cable 1 feeds an equalizer 3a, followed by a D.C. amplifier 3, a modulator 4, a band-pass filter 5 and an audio repeater 6 whose output may feed further submerged repeaters 8. At the shore station filters are provided for separating the incoming audio frequency from the outgoing D.C. supply for the repeaters. The audiofrequency signal is preferably frequency modulated. The modulator and audio amplifiers are preferably transistorized and the D.C. amplifier may be a magnetic amplifier whose supply frequency may be obtained from a transistor oscillator. Switching arrangements (not shown) may be provided to provide a through D.C. connection for transmission in the opposite direction. More than one audio-frequency amplifier may be provided.
GB2702855A 1955-09-21 1955-09-21 Improvements in means for receiving low frequency signals from submarine cables Expired GB842442A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2702855A GB842442A (en) 1955-09-21 1955-09-21 Improvements in means for receiving low frequency signals from submarine cables
FR1160750D FR1160750A (en) 1955-09-21 1956-09-20 Method of transferring signals from a submarine cable to a coast station and equipment for implementing said method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2702855A GB842442A (en) 1955-09-21 1955-09-21 Improvements in means for receiving low frequency signals from submarine cables

Publications (1)

Publication Number Publication Date
GB842442A true GB842442A (en) 1960-07-27

Family

ID=10252986

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2702855A Expired GB842442A (en) 1955-09-21 1955-09-21 Improvements in means for receiving low frequency signals from submarine cables

Country Status (2)

Country Link
FR (1) FR1160750A (en)
GB (1) GB842442A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157133A (en) * 1984-04-05 1985-10-16 Philips Electronic Associated Closed circuit television system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157133A (en) * 1984-04-05 1985-10-16 Philips Electronic Associated Closed circuit television system

Also Published As

Publication number Publication date
FR1160750A (en) 1958-07-29

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