GB531556A - Improved arrangements for suppressing the carrier frequency on transmission systems - Google Patents

Improved arrangements for suppressing the carrier frequency on transmission systems

Info

Publication number
GB531556A
GB531556A GB19568/39A GB1956839A GB531556A GB 531556 A GB531556 A GB 531556A GB 19568/39 A GB19568/39 A GB 19568/39A GB 1956839 A GB1956839 A GB 1956839A GB 531556 A GB531556 A GB 531556A
Authority
GB
United Kingdom
Prior art keywords
valve
carrier frequency
carrier
potential
voltage
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
GB19568/39A
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.)
GURNEY OLIVER PROBERT
RICHARD ADNEY MEERS
STC PLC
Original Assignee
GURNEY OLIVER PROBERT
RICHARD ADNEY MEERS
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 GURNEY OLIVER PROBERT, RICHARD ADNEY MEERS, Standard Telephone and Cables PLC filed Critical GURNEY OLIVER PROBERT
Priority to GB19568/39A priority Critical patent/GB531556A/en
Priority to FR867237D priority patent/FR867237A/en
Publication of GB531556A publication Critical patent/GB531556A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

531,556. Wireless transmitting systems. STANDARD TELEPHONES & CABLES, Ltd., MEERS, R. A., PROBERT, G. O., and RATTUE, E. A. July 5, 1939, No. 19568. [Class 40 (v)] In a carrier wave telephone or telegraph transmission system having means for transmitting the carrier frequency only during the transmission of signals D.C. voltages derived from the signal currents are arranged to remove a blocking potential on a grid of a valve in the carrier path. Speech currents applied to transformer T<SP>1</SP> are rectified by a double diode V<SP>1</SP> to produce a voltage across resistance R<SP>1</SP>, which voltage applied to grid G<SP>21</SP> serves to block valve V<SP>2</SP>. This causes the anode potential to rise so as to remove a blocking bias from valve V<SP>3</SP> which thus serves to partially short circuit resistance R<SP>11</SP> and hence to reduce the positive bias of cathode of valve V4 due to voltage drop across R<SP>10</SP>, R<SP>11</SP>. This valve V4 in the carrier path becomes conductive and the carrier frequency is transmitted. A condenser C<SP>1</SP> gives a hangover time sufficient to cover intersyllabic pauses. For telegraphic working keying is effected across A, B, the positive potential for marking being applied at B.
GB19568/39A 1939-07-05 1939-07-05 Improved arrangements for suppressing the carrier frequency on transmission systems Expired GB531556A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB19568/39A GB531556A (en) 1939-07-05 1939-07-05 Improved arrangements for suppressing the carrier frequency on transmission systems
FR867237D FR867237A (en) 1939-07-05 1940-09-19 Carrier wave transmission systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB867237X 1939-07-05
GB19568/39A GB531556A (en) 1939-07-05 1939-07-05 Improved arrangements for suppressing the carrier frequency on transmission systems

Publications (1)

Publication Number Publication Date
GB531556A true GB531556A (en) 1941-01-07

Family

ID=33031448

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19568/39A Expired GB531556A (en) 1939-07-05 1939-07-05 Improved arrangements for suppressing the carrier frequency on transmission systems

Country Status (2)

Country Link
FR (1) FR867237A (en)
GB (1) GB531556A (en)

Also Published As

Publication number Publication date
FR867237A (en) 1941-10-07

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