US1537682A - Telegraphic receiving system - Google Patents

Telegraphic receiving system Download PDF

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Publication number
US1537682A
US1537682A US419778A US41977820A US1537682A US 1537682 A US1537682 A US 1537682A US 419778 A US419778 A US 419778A US 41977820 A US41977820 A US 41977820A US 1537682 A US1537682 A US 1537682A
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US
United States
Prior art keywords
current
tube
receiver
grid
amplitudes
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
US419778A
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English (en)
Inventor
Krause Georg
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens Corp
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 DES49013A priority Critical patent/DE388771C/de
Priority to AT93372D priority patent/AT93372B/de
Priority to CH92009D priority patent/CH92009A/de
Priority to FR509380A priority patent/FR509380A/fr
Priority to GB17047/20A priority patent/GB146122A/en
Application filed by Siemens Corp filed Critical Siemens Corp
Priority to US419778A priority patent/US1537682A/en
Application granted granted Critical
Publication of US1537682A publication Critical patent/US1537682A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/20—Repeater circuits; Relay circuits
    • H04L25/24—Relay circuits using discharge tubes or semiconductor devices

Definitions

  • an amplification of such kind has
  • the small amplitudes can be amplified sufiiciently to secure the actuation of the receiver without this latter being endangered by the great secondary amplitudes produced by stronger current impulses.
  • This is effected accordmg to the present invention by employing an amplifier having its current amplitudes limited in such a way that tlroseamplitudes which extend to its current limits, suflice to secure the actuation of the receiver, while the secondary amplitudes transgressing such limits are cut otl at the permissible current limits.
  • Amplification of this sort can be carried out in an especially efiective manner with the aid of glow cathode relays with pure electron emission, whose current limits can easily be predetermined by selecting suit able potentials for the electrodes, a suitable surface area and temperature of the glow cathode.
  • One may however employ as well other vacuum tube amplifiers and devices of a difl'erent kind which may for instance be connected with current limiting means such as-a highly tempered iron wire, or devices provided with mechanical current limiting means such as for instance a Brown relay provided with stops.
  • a steep- Figure-2 shows a receiving system according to the invention to be used in connection with a double line
  • FIG. 3 shows the connections for keeping the closed circuit current off the relay
  • Figure 4 shows a transformer
  • Figure 5 shows a condenser connected in series with the amplifier
  • -Fi ure 6 shows a system embodying two amplifiers connected in series.
  • a receiving system according to the present invention designed for a, double line is illustrated in Fig. 2.
  • a receiving telegraphic signals consisting of direct current impulses it is desirable in many cases to preserve in the received signal the form of the impulses arriving at the receivingstation as truly as possible.
  • the customary inductive coupling as shown for instance in Fig. 4 exerting a strongly distorting action upon the direct current impulses arrlving at the end of the line.
  • Even a direct connec tion of the line with the grid and the cathode of the amplifier tube does not furnish the result desired on account of wave reflections.
  • the system illustrated in Fig. 2- allows to obtain a true reproduction of the si nals arriving at the end of the line by an o mic resistance of suitable dimensions bridged across the line, such resistance at the same time serving to adjust the zero potential of the grid.
  • This continuous current grid potential is mas preferably chosen such that it corresponds to the middle of'the linear or straight portion of the characteristic curve of the am- ,plifier.
  • a cathode ray tube V having a hot cathode or filament F, a grid G and a plate or anode P, the filament F being heated by a battery A.
  • the secondary or anode current of the tube may serve to actuate some suitable receiving device such as a polarized relay R whose contacts are marked in the drawing.
  • a polarized relay R whose contacts are marked in the drawing.
  • the secondary current impulses generated by this system further allow the use of any suitable kind of receiving device since the arriving impulses resemble in form the transmitted ones.
  • the receiver R receives its current from the amplifying device over a capacity K, a resistance R being inserted in the anode circuit in parallel with the receiver.
  • B is the anode battery.
  • the relay R is only affected on changes, but as positive and negative waves are succeeding one another, the armature is only reversed once for each impulse.
  • care must be taken to make the time of dying away of the discharge current of the condensor as long as possible in order to prevent it from falling to zero before the end of the signal. This may be obtained by a sufliciently large capacity K, and a sufiiciently high resistance R.
  • the time of dying away of the capacity discharge current can be chosen such that there result only very quick and short current impulses which actuate the relay whose armature is reversed in every instance by the impulses following each other.
  • transformers and capacities further involves the advantage that in the partial transformation of the impulses the points and corners which coincide according to curves I, II and II (Fig. 1) and correspond to the reversals of current, also coincide with the lines of intersect-ionof the transformed impulses and thezero line. In the case of high amplification, therefor, ow-
  • the receiving relay is actuated almost exactly in conformation with the corners, this being of paramount importance for all devices working in synchronism.
  • the connection illustrated in Fig. 6 is preferably employed.
  • the first amplifying tube is selected so that all impulses of the amplified cable end current lie within the current limits of the amplifying tube.
  • the first amplifier tube V is coupled with the second one V over a capacity K, and a resistance R which may be an inductance.
  • a resistance R which may be an inductance.
  • the current fluctuations in its secondary circuit cause fluctuations of voltage at the resistance R, and these fluctuations are transferred over the capacity K to the grid of the amplifier tube V
  • the grid of the latter receives its direct current potential from a battery I), over the resistance R which must be of sufiicient size to prevent a premature dying away of the condenser charge.
  • the receiver B may be connected to the secondary system of tube V in a manner similar to that shown in Fig. 3, i. e.. by connecting it to the ends of resistance R by way of condenser K All the arrangements described may of course be used also in single core cables with earth return line. They may further be employed with advantage for transferring the signals from one cable section to the other.
  • I claim 1 The method of receiving telegraphic signals formed of direct current impulses which consists in highly amplifying the signals to form steep current curves and suppressing the apexes of such secondary amplitudes as might disturb the operation of the receiver before the said amplitudes reach the receiver, in limitin the current of saturation of the amplifying tube for amplifying the signals so that the apexes-of said secondary amplitudes are cut off to obtain substantially rectangular current curves in said receiver.
  • Receiving system of the kind described comprising in combination a cathode ray tube having its primary circuit connected to the line, a receiving device connected in series with the secondary tube circuit, a secondary current in said tube being limited by the choice of an appropriated current of saturation, so that the apexes of such secondary amplitudes are cut oil, to obtain substantially rectangular current curves in said receiver.
  • a receiving system of the kind described comprising in combination an ohmic resistance placed across the ends of the receiving line, a cathode ray tube having its grid circuit connected to said resistance, a direct current source for impressing a potential to the grid, means for conducting also the direct current derived from said source over said resistance, said cathode tube adapted to amplify fully the lowest incoming waves, an ohmic resistance inserted in the secondary or anode circuit of said cathode ray tube, a second cathode ray tube having its grid circuit connected to the secondary system of said first mentioned cathode tube, a source of direct current potential applied to the grid of said second tube and a resistance in circuit therewith, a receiver connected to the secondary system of said second .llt)
  • the current of saturation of the said second tube being limited so as to cut off the apexes of such secondary amplitudes which might disturb the work of said receiver, a resistance inserted in the anode circuit of said second tube having the receiving apparatus connected to its ends, and a capacity inserted in the connection between the anode circuit of said first mentioned cathode ray tube and the grid circuit of said second cathode 10 ray tube, a capacity being also inserted in circuit with aforesaid connection of the receiving apparatus.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Geophysics And Detection Of Objects (AREA)
US419778A 1918-09-27 1920-10-26 Telegraphic receiving system Expired - Lifetime US1537682A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DES49013A DE388771C (de) 1918-09-27 1918-09-27 Verfahren zum Empfang von ueber Telegraphenleitungen gesandten Gleichstromstoessen gleicher oder verschiedener Polaritaet
AT93372D AT93372B (de) 1918-09-27 1919-09-24 Vorrichtung zum Empfang von über Telegraphenleitungen gesendeten Gleichstromstößen gleicher oder verschiedener Polarität.
CH92009D CH92009A (de) 1918-09-27 1919-10-27 Verfahren zum Empfang von über Telegraphenleitungen gesandten Gleichstromstössen gleicher oder verschiedener Polarität.
FR509380A FR509380A (fr) 1918-09-27 1920-02-03 Système de réception d'impulsions de courant continu, de meme polarité ou de polarité différente, transmises sur des lignes télégraphiques
GB17047/20A GB146122A (en) 1918-09-27 1920-06-23 Improvements in and relating to telegraphic reception
US419778A US1537682A (en) 1918-09-27 1920-10-26 Telegraphic receiving system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES49013A DE388771C (de) 1918-09-27 1918-09-27 Verfahren zum Empfang von ueber Telegraphenleitungen gesandten Gleichstromstoessen gleicher oder verschiedener Polaritaet
US419778A US1537682A (en) 1918-09-27 1920-10-26 Telegraphic receiving system

Publications (1)

Publication Number Publication Date
US1537682A true US1537682A (en) 1925-05-12

Family

ID=25995294

Family Applications (1)

Application Number Title Priority Date Filing Date
US419778A Expired - Lifetime US1537682A (en) 1918-09-27 1920-10-26 Telegraphic receiving system

Country Status (6)

Country Link
US (1) US1537682A (de)
AT (1) AT93372B (de)
CH (1) CH92009A (de)
DE (1) DE388771C (de)
FR (1) FR509380A (de)
GB (1) GB146122A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767308C (de) * 1936-05-15 1952-06-13 Lorenz A G C Verstaerker fuer eine Entfernungsmessanordnung
DE918151C (de) * 1942-02-20 1954-09-20 Krone Kg Anordnung fuer zeitgetreue Impulsverstaerkung

Also Published As

Publication number Publication date
DE388771C (de) 1924-01-22
CH92009A (de) 1921-12-01
AT93372B (de) 1923-06-25
FR509380A (fr) 1920-11-08
GB146122A (en) 1921-09-22

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