GB962352A - Control circuit for transmission lines - Google Patents

Control circuit for transmission lines

Info

Publication number
GB962352A
GB962352A GB4213061A GB4213061A GB962352A GB 962352 A GB962352 A GB 962352A GB 4213061 A GB4213061 A GB 4213061A GB 4213061 A GB4213061 A GB 4213061A GB 962352 A GB962352 A GB 962352A
Authority
GB
United Kingdom
Prior art keywords
line
amplifier
signals
transmission
applies
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
GB4213061A
Inventor
John Bernard Richardson
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.)
Pye Electronic Products Ltd
Original Assignee
Pye Ltd
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 Pye Ltd filed Critical Pye Ltd
Priority to GB4213061A priority Critical patent/GB962352A/en
Publication of GB962352A publication Critical patent/GB962352A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H04L5/16—Half-duplex systems; Simplex/duplex switching; Transmission of break signals non-automatically inverting the direction of transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Amplifiers (AREA)

Abstract

962,352. Two-way transmission systems; telegraphy. PYE Ltd. Nov. 14, 1962 [Nov. 24, 1961], No. 42130/61. Headings H4P and H4R. In a circuit for controlling the transmission and reception of signals over a transmission line, a first transistor presents a high impedance to the line in the receive condition and applies the signals to the line in the transmit condition while a second transistor prevents the receiver amplifier from operating during the transmission of signals. As shown, incoming signals from the line L are fed to amplifier A over primary P and secondary S2 of a transformer and resistor R3. Cold cathode tubes V1, V2, V3 are cut-off and TR1 is therefore cut-off presenting a high impedance to the line, while TR2 is conducting so that the current through R2 applies a power supply voltage to amplifier A. When signals are to be transmitted one of the tubes V1, V2, V3 is fired. This applies a positive voltage to the emitter of TR1 and the base of TR2 so that TR1 conducts presenting a low impedance to the line, and TR2 is cut-off so that the power supply to amplifier A is removed. If V2 conducts, for example, TONE 1 is applied to the base of TR1 where it is amplified and applied to line L over winding S1. It is stated that the cold cathode tubes may be replaced by other electronic switches, for example triggered transistor types, and control of the amplifier may be effected by variation of the bias to the first stage.
GB4213061A 1961-11-24 1961-11-24 Control circuit for transmission lines Expired GB962352A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4213061A GB962352A (en) 1961-11-24 1961-11-24 Control circuit for transmission lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4213061A GB962352A (en) 1961-11-24 1961-11-24 Control circuit for transmission lines

Publications (1)

Publication Number Publication Date
GB962352A true GB962352A (en) 1964-07-01

Family

ID=10422990

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4213061A Expired GB962352A (en) 1961-11-24 1961-11-24 Control circuit for transmission lines

Country Status (1)

Country Link
GB (1) GB962352A (en)

Similar Documents

Publication Publication Date Title
GB1025895A (en) A circuit arrangement for the connection of a video-signal producer to a television receiver
US2797261A (en) Carrier telegraph receiver
US4054837A (en) Bidirectional radio frequency amplifier with receiver protection
GB962352A (en) Control circuit for transmission lines
GB705023A (en) Improvements relating to carrier-current intercommunication apparatus
GB879606A (en) Improvements relating to inductive loop communication systems
GB1498190A (en) Deflection circuit for television receiver set or the lik
GB940452A (en) Electric signal circuits including repeaters
US3172960A (en) Symmetrical transistor amplifier
GB966755A (en) Improvements in or relating to circuit arrangements employed in telegraphy
JPS59205831A (en) Structure of remote switching circuit
US2044062A (en) Impulse telegraph repeater
GB857807A (en) Improvements relating to switching modulators
GB592917A (en) Improvements in or relating to volume control and mixing arrangements in broadcasting systems and the like
GB613741A (en) Improvements in or relating to radio and other transmitting and receiving systems
GB949748A (en) Improvements in or relating to transistor amplifier devices equipped with an ear phone and a loudspeaker
US1926082A (en) Signaling
GB948363A (en) Improvements in electronic apparatus
US2821571A (en) Communication system
GB668369A (en) Device for the retransmission of signals for a telephone line with two wires
GB1363553A (en) Telegraphic keying circuits
US2476313A (en) Control system
GB1070661A (en) Automatic gain control arrangements in transistor amplifiers
GB1039302A (en) Circuit arrangement for contrast control in television receivers
GB1062207A (en) Teleprinter line circuit