GB352401A - Improvements in or relating to reception of telegraph signals - Google Patents

Improvements in or relating to reception of telegraph signals

Info

Publication number
GB352401A
GB352401A GB1057130A GB1057130A GB352401A GB 352401 A GB352401 A GB 352401A GB 1057130 A GB1057130 A GB 1057130A GB 1057130 A GB1057130 A GB 1057130A GB 352401 A GB352401 A GB 352401A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
circuit
resistances
current
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
GB1057130A
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.)
LAUNCELOT EDGAR CURRAH
STC PLC
Original Assignee
LAUNCELOT EDGAR CURRAH
Standard Telephone and Cables 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
Application filed by LAUNCELOT EDGAR CURRAH, Standard Telephone and Cables PLC filed Critical LAUNCELOT EDGAR CURRAH
Priority to GB1057130A priority Critical patent/GB352401A/en
Publication of GB352401A publication Critical patent/GB352401A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
    • 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
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Fuel Cell (AREA)

Abstract

352,401. Multiplex code telegraphy. STANDARD TELEPHONES & CABLES, Ltd., SANDEMAN, E. K., CHANTER, A. J., and CURRAH, L. E., Columbia House, Aldwych, London. April 3, 1930, No. 10571. [Class 40 (iii).] Multiplex telegraph receiving equipment comprises a distributer and in each channel, for the purpose of distending the received signals, an arrangement comprising two thermionic valves having electrically symmetrical grid and plate circuits. The plate circuit of each valve is connected to the grid circuit of the other valve so that an electric impulse applied to the grid of either valve causes a charge in the plate circuit current in that valve to be applied to the grid of the other valve whereby the anode current of one valve is reduced and that in the other increased until a condition of stable equilibrium is reached and maintained. The circuit is restored to normal by an extra brush and set of segments on the distributer. The circuit shown in Fig. 3 has two states of equilibrium, viz. (a) when current is flowing through the valve 1 and produces in a resistance 14 sufficient voltage so to bias the grid 21 of the valve 2 that no current passes through it, and (b) when current flows through the valve 2 and not through the valve 1. Signal voltages from a line 61 are applied by amplifiers 71, 72 to resistances 17, 27 so that positive signals produce one state of equilibrium and negative signals the opposite state. Recorders mav be connected across resistances 14, 24, or, if it is desired to avoid inductance in the plate circuits, the receiving relay is connected in the plate circuit of a valve with its grid connected to that of one of the valves of the shaping circuit, Fig. 9 (not shown). According to modifications, the effect of earth capacity in batteries 16, 26 is avoided by connecting them in series with a pair of resistances in parallel with a condenser, Fig. 4 (not shown) ; the effects of small variations in the batteries are obviated by connecting resistances 18, 28, Fig. 7, to a potentiometer, Fig. 6 (not shown), or as shown.
GB1057130A 1930-04-03 1930-04-03 Improvements in or relating to reception of telegraph signals Expired GB352401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1057130A GB352401A (en) 1930-04-03 1930-04-03 Improvements in or relating to reception of telegraph signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1057130A GB352401A (en) 1930-04-03 1930-04-03 Improvements in or relating to reception of telegraph signals

Publications (1)

Publication Number Publication Date
GB352401A true GB352401A (en) 1931-07-03

Family

ID=9970296

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1057130A Expired GB352401A (en) 1930-04-03 1930-04-03 Improvements in or relating to reception of telegraph signals

Country Status (1)

Country Link
GB (1) GB352401A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461120A (en) * 1944-11-02 1949-02-08 Hazeltine Research Inc Signal generator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461120A (en) * 1944-11-02 1949-02-08 Hazeltine Research Inc Signal generator

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