US1767200A - Line balance for loaded telephone circuits - Google Patents

Line balance for loaded telephone circuits Download PDF

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Publication number
US1767200A
US1767200A US178458A US17845827A US1767200A US 1767200 A US1767200 A US 1767200A US 178458 A US178458 A US 178458A US 17845827 A US17845827 A US 17845827A US 1767200 A US1767200 A US 1767200A
Authority
US
United States
Prior art keywords
line
cable
impedance
capacity
balance
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
US178458A
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English (en)
Inventor
Bartlett Albert Charles
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.)
General Electric Company PLC
Original Assignee
General Electric Company PLC
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 NL15826D priority Critical patent/NL15826C/xx
Priority claimed from GB854624A external-priority patent/GB232762A/en
Priority to FR595893D priority patent/FR595893A/fr
Priority to US19421A priority patent/US1767199A/en
Priority claimed from US19421A external-priority patent/US1767199A/en
Priority to DEG63919D priority patent/DE504876C/de
Application filed by General Electric Company PLC filed Critical General Electric Company PLC
Priority to US178458A priority patent/US1767200A/en
Application granted granted Critical
Publication of US1767200A publication Critical patent/US1767200A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/40—Artificial lines; Networks simulating a line of certain length

Definitions

  • This invention relates to line balances for loaded telephone'circuits.
  • the problem of making satisfactory line balances is that of devising some comparatively simple and cheap combination of impedance elements which shall have at all telephonic frequencies an impedance nearly the same as the sending end impedance of the actual line.
  • the object of the invention is to provide improved line balances the impedance of which can be made to simulate closely over the range'of telephonic frequencies the impedance of a periodically, loaded cable which is terminated at half cable section or over a considerable range of fractional cable section terminations.
  • a cable section is meant the length of cable between two loading coils.
  • a line balance according to the present invent-ion consists of a new arrangement of elements having inductance, capacity and resistance, the values of which may be determined in terms of the constants of the line I fully described.
  • the line balance described in this specification is primarily a mid-cable sect-ion balance, yet it can be adapted to balance the line over a considerable range of fractional cable section terminations;
  • the problem thenis tomake 1 up b1) and has the value .9
  • KL A (approximately)
  • Kr 2.3 96A.
  • 11 K and 1' are now all determined in terms of constants of the cable.
  • the reactance of the network of Fig. I is. from (4) y L p( 2(- P 2) 1 (1 p KL +12 K r Substituting values from above in the second term of this expression, the term becomes (0.905r /Z+0.6451-A 1+0.4p A +pA In practice this is approximately equal to .0.905 .r.JZ
  • a line balance the impedance of which over the range of telephonic frequencies simulates closely the, sendin end impedance of a periodically loaded cine terminated at half cable section, comprisinga number of elements including one capacity arranged in parallel with a group of elements comprehending an inductance .in series with a resistance and a second capacity connected in parallel with the resistance and a third capacity'placed in series with the parallel circuits afforded by the one capacity and the group of elements, the values of-the several elements being determined in terms of the constants of the line to be balanced, sub;
  • Aline balance the impedance of which over the range of telephonic frequencies simulates closely the sending end impedance of a periodically loaded cable terminated at a fractional cable section termination comprising-a number of elements including one ca acity adjusted to the desired fractional ca le termination, and arranged in parallel with a group of elements comprising an inductance in series with a resistance and a second capacity connected in parallel wv'iththe resistance, and a third capacity placed 'in series with the parallel circuits afiorded by the one capacity and the group of elements, the values of the several elements of the balance first bein determined in terms of the constants of t e line to be balanced, substantially as described.
  • a linebalance the impedance of which over the range of telephonic frequencies simulates closely the sendin end impedance of a periodically loaded ca le terminated at a small fractional cable section termination
  • the said capacity% ing an inductance in series with a resistance and a second capacity connected in parallel with the resistance, and a third capacity conzero as one limit eing. arranged in parallel with a group of elements comprisnected in series with the paraillel circuits afiorded by the one capacity and the group of e1ements,the values of the several ele-' ments of the balancefirst being determined in terms of the constants of the line to be balanced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
US178458A 1924-04-04 1927-03-25 Line balance for loaded telephone circuits Expired - Lifetime US1767200A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL15826D NL15826C (en:Method) 1924-04-04
FR595893D FR595893A (fr) 1924-04-04 1925-03-28 Perfectionnements aux dispositifs d'équilibrage pour circuits téléphoniques chargés
US19421A US1767199A (en) 1924-04-04 1925-03-30 Line balance for loaded telephone circuits
DEG63919D DE504876C (de) 1924-04-04 1925-03-31 Nachbildung fuer pupinisierte Fernsprechleitungen
US178458A US1767200A (en) 1924-04-04 1927-03-25 Line balance for loaded telephone circuits

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB854624A GB232762A (en) 1924-04-04 1924-04-04 Improvements in line balances for loaded telephone circuits
US19421A US1767199A (en) 1924-04-04 1925-03-30 Line balance for loaded telephone circuits
US178458A US1767200A (en) 1924-04-04 1927-03-25 Line balance for loaded telephone circuits

Publications (1)

Publication Number Publication Date
US1767200A true US1767200A (en) 1930-06-24

Family

ID=27255219

Family Applications (1)

Application Number Title Priority Date Filing Date
US178458A Expired - Lifetime US1767200A (en) 1924-04-04 1927-03-25 Line balance for loaded telephone circuits

Country Status (4)

Country Link
US (1) US1767200A (en:Method)
DE (1) DE504876C (en:Method)
FR (1) FR595893A (en:Method)
NL (1) NL15826C (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523453A (en) * 1947-11-12 1950-09-26 James H Starr Calculating table and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523453A (en) * 1947-11-12 1950-09-26 James H Starr Calculating table and the like

Also Published As

Publication number Publication date
DE504876C (de) 1930-09-24
NL15826C (en:Method)
FR595893A (fr) 1925-10-10

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