US1653971A - Duplex method for telegraph cables - Google Patents

Duplex method for telegraph cables Download PDF

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Publication number
US1653971A
US1653971A US86955A US8695526A US1653971A US 1653971 A US1653971 A US 1653971A US 86955 A US86955 A US 86955A US 8695526 A US8695526 A US 8695526A US 1653971 A US1653971 A US 1653971A
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United States
Prior art keywords
cable
frequencies
duplex method
frequency
duplex
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Expired - Lifetime
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US86955A
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English (en)
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Salinger Hans
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Individual
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Individual
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    • 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
    • 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
    • H04L5/1407—Artificial lines or their setting

Definitions

  • Figure 1 represents an artificial cable whilst Figures 2 to 4 are explanatory diagrams
  • the transmitting currents may be considered as a superposition of sinusoidal alternating currents and consequently the reproduction of the artificial line need be exact 0111 as regards that range of frequency whic corresponds to the frequency of these currents.
  • Figure 2 shows the curve of the amplitudes of a single sign, viz, of a Morse dot. This curve shows the relative amplitudes of the various frequencies. Only the part of the curve to the left of the dotted line belongs to the required band of frequencies. (See for instance Milnor, Journal A. I. E. E. 41, pages 118136 of 1922.)
  • Figure 3 shows similarly the curve correspondlng to a method of telegraphy in which a single Morse dot consists ofa tive rectangle as indicated inthe figure.
  • the leakage of the cable depends to a large extent on the frequency,,and as regards continuous current it is much smaller than, for instance, for alternating currents of 5 to 10 periods Moreover, as a rule, as regards the medium frequency of telegraphic transmission the cable has to be considered electrically so long that only its wave resistance need be artificially reproduced. On the other hand, as regards the lowest frequencies and permanent current, electrically considered the cable is not long, so that now the important factor is not the wave resistance, but the impedance, which in that case is different therefrom The impedance, however, depends to a very large extent upon the apparatus which are connected at the far end.
  • FIG. 1 One arrangement for carrying the invention intoeffect is illustrated by way of example in Figure 1, in which B is the transmitting battery, K, and K are the arms of the bridge, L is the cable and N the artificial line.
  • a network of filtering circuits is inserted before the receiver, the object of which filtering circuits is to keep away from.
  • th1s network of filtering circuits may also be arranged in series with the .battery B.
  • the artificial line N which has been illustrated in the figure is an arrangedotted line). Howa These frequencies are positive and a nega that considerably increases the difficulty of balancing, since towards the very low frequencies the properties of thearrangement which has proved to be successfulin the experiments that have been carried out in connection with-a cable having a high inductance.
  • w 'w Q03, w are ohmic resistances, s and s, are self-inductance coils and" c c 0, and c, are condensers.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Communication Cables (AREA)
US86955A 1925-02-10 1926-02-08 Duplex method for telegraph cables Expired - Lifetime US1653971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE247545T 1925-02-10

Publications (1)

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US1653971A true US1653971A (en) 1927-12-27

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ID=31893633

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US86955A Expired - Lifetime US1653971A (en) 1925-02-10 1926-02-08 Duplex method for telegraph cables

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US (1) US1653971A (enrdf_load_stackoverflow)
GB (1) GB247545A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB247545A (enrdf_load_stackoverflow) 1927-01-13

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