GB501028A - Improvements in or relating to electric signalling systems - Google Patents

Improvements in or relating to electric signalling systems

Info

Publication number
GB501028A
GB501028A GB2290337A GB2290337A GB501028A GB 501028 A GB501028 A GB 501028A GB 2290337 A GB2290337 A GB 2290337A GB 2290337 A GB2290337 A GB 2290337A GB 501028 A GB501028 A GB 501028A
Authority
GB
United Kingdom
Prior art keywords
equipment
pentode
signal
transformer
shd
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
GB2290337A
Other languages
English (en)
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.)
PHILIP ROBERT THOMAS
STC PLC
Original Assignee
PHILIP ROBERT THOMAS
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
Priority to NL50376D priority Critical patent/NL50376C/xx
Application filed by PHILIP ROBERT THOMAS, Standard Telephone and Cables PLC filed Critical PHILIP ROBERT THOMAS
Priority to GB2290337A priority patent/GB501028A/en
Priority to FR842319D priority patent/FR842319A/fr
Publication of GB501028A publication Critical patent/GB501028A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/14—Arrangements providing for calling or supervisory signals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
GB2290337A 1937-08-20 1937-08-20 Improvements in or relating to electric signalling systems Expired GB501028A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
NL50376D NL50376C (enrdf_load_stackoverflow) 1937-08-20
GB2290337A GB501028A (en) 1937-08-20 1937-08-20 Improvements in or relating to electric signalling systems
FR842319D FR842319A (fr) 1937-08-20 1938-08-19 Appareils de signalisation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2290337A GB501028A (en) 1937-08-20 1937-08-20 Improvements in or relating to electric signalling systems

Publications (1)

Publication Number Publication Date
GB501028A true GB501028A (en) 1939-02-20

Family

ID=10186920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2290337A Expired GB501028A (en) 1937-08-20 1937-08-20 Improvements in or relating to electric signalling systems

Country Status (3)

Country Link
FR (1) FR842319A (enrdf_load_stackoverflow)
GB (1) GB501028A (enrdf_load_stackoverflow)
NL (1) NL50376C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
NL50376C (enrdf_load_stackoverflow)
FR842319A (fr) 1939-06-09

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