GB479911A - Improvements in means of and apparatus for conducting telephony through long cables - Google Patents

Improvements in means of and apparatus for conducting telephony through long cables

Info

Publication number
GB479911A
GB479911A GB2218236A GB2218236A GB479911A GB 479911 A GB479911 A GB 479911A GB 2218236 A GB2218236 A GB 2218236A GB 2218236 A GB2218236 A GB 2218236A GB 479911 A GB479911 A GB 479911A
Authority
GB
United Kingdom
Prior art keywords
conductor
battery
over
signalling
resistance
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
GB2218236A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB2218236A priority Critical patent/GB479911A/en
Publication of GB479911A publication Critical patent/GB479911A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/42—Circuits for by-passing of ringing signals

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

479,911. Telephone transmission systems. ESTAUGH, W. Aug. 12, 1936, No. 22182. [Class 40 (iv)] For transmission over a, cable comprising a signalling conductor a separated from a concentric return conductor e by a further concentric shielding conductor b, the primary of the receiving transformer g is connected between the signalling. conductor a and the positive pole of a charging battery f, the receiving end of the shielding conductor b is connected over a resistance h to the same pole of battery f, the transmitting end of the signalling conductor a is connected through a resistance m and the secondary of a transformer j to the negative pole of an assisting battery i of lower voltage than battery f, and the positive pole of battery i is connected over a resistance n to the transmitting end of the shielding conductor b and over the return conductor e to the negative pole of battery f. Resistances m, n are independently adjusted to give the same fall of potential along conductors a, b so that signal impulses in conductor a are screened by similar impulses in conductor b thus ensuring transmission without retardation or distortion due to electrostatic effects. The receiver o may be connected to the secondary of transformer g over an amplifier 1.
GB2218236A 1936-08-12 1936-08-12 Improvements in means of and apparatus for conducting telephony through long cables Expired GB479911A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2218236A GB479911A (en) 1936-08-12 1936-08-12 Improvements in means of and apparatus for conducting telephony through long cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2218236A GB479911A (en) 1936-08-12 1936-08-12 Improvements in means of and apparatus for conducting telephony through long cables

Publications (1)

Publication Number Publication Date
GB479911A true GB479911A (en) 1938-02-14

Family

ID=10175273

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2218236A Expired GB479911A (en) 1936-08-12 1936-08-12 Improvements in means of and apparatus for conducting telephony through long cables

Country Status (1)

Country Link
GB (1) GB479911A (en)

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