GB599299A - Equaliser for telephonic repeaters - Google Patents

Equaliser for telephonic repeaters

Info

Publication number
GB599299A
GB599299A GB29589/45A GB2958945A GB599299A GB 599299 A GB599299 A GB 599299A GB 29589/45 A GB29589/45 A GB 29589/45A GB 2958945 A GB2958945 A GB 2958945A GB 599299 A GB599299 A GB 599299A
Authority
GB
United Kingdom
Prior art keywords
resistance
same
loaded
equalized
series
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
GB29589/45A
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.)
Societe Anonyme de Telecommunications SAT
Original Assignee
Societe Anonyme de Telecommunications SAT
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 Societe Anonyme de Telecommunications SAT filed Critical Societe Anonyme de Telecommunications SAT
Publication of GB599299A publication Critical patent/GB599299A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/14—Control of transmission; Equalising characterised by the equalising network used
    • H04B3/143—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers
    • H04B3/145—Control of transmission; Equalising characterised by the equalising network used using amplitude-frequency equalisers variable equalisers

Landscapes

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

Abstract

599,299. Two-way transmission. SOC. ANON. DE TELECOMMUNICATIONS. Nov. 6, 1945, No. 29589. Convention date, Sept. 23, 1942. [Class 40 (iv)] [Also in Group XL] In an equalizer 7 for telephonic repeaters, in which a tapped resistance 8 enables the attenuation to be adjusted for lines of different lengths, the same setting of the resistance 8 can be used for heavily loaded as for lightly loaded lines. To this end the resistance 8 is formed as a series of T-sections between terminals 14, 20, Fig. 2, and a switch 15 is closed or open according as the line to be equalized is loaded with 88 or 177 mH per 1800 metres. The resistances are so calculated that the settings of the wiper 16 are the same in both cases for the same lengths of time. In this way, the repeater is equalized for frequencies above the resonant frequency, 800 c/s., of the network. If distortion results at the lower frequencies, a similar resistance 18 with shunt condenser 19 is inserted in series.
GB29589/45A 1942-09-23 1945-11-06 Equaliser for telephonic repeaters Expired GB599299A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR952393T 1942-09-23

Publications (1)

Publication Number Publication Date
GB599299A true GB599299A (en) 1948-03-09

Family

ID=9486587

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29589/45A Expired GB599299A (en) 1942-09-23 1945-11-06 Equaliser for telephonic repeaters

Country Status (2)

Country Link
FR (1) FR952393A (en)
GB (1) GB599299A (en)

Also Published As

Publication number Publication date
FR952393A (en) 1949-11-16

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