GB1537557A - Telegraph transmission - Google Patents

Telegraph transmission

Info

Publication number
GB1537557A
GB1537557A GB3506976A GB3506976A GB1537557A GB 1537557 A GB1537557 A GB 1537557A GB 3506976 A GB3506976 A GB 3506976A GB 3506976 A GB3506976 A GB 3506976A GB 1537557 A GB1537557 A GB 1537557A
Authority
GB
United Kingdom
Prior art keywords
filter
amplifier
telegraph
coupler
nolton
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
GB3506976A
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.)
NOLTON COMMUNICATIONS Ltd
Original Assignee
NOLTON COMMUNICATIONS 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 NOLTON COMMUNICATIONS Ltd filed Critical NOLTON COMMUNICATIONS Ltd
Priority to GB3506976A priority Critical patent/GB1537557A/en
Publication of GB1537557A publication Critical patent/GB1537557A/en
Expired legal-status Critical Current

Links

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
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
    • H04L25/0268—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling with modulation and subsequent demodulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

1537557 Telegraphy NOLTON COMMUNICATIONS Ltd 23 Nov 1977 [23 Aug 1976] 35069/76 Heading H4P A telegraph (telex) transmitter incorporates a known optical coupler 12 (LED-phototransistor) to isolate telegraph apparatus (not shown) operating at voltage levels 0, 12 V. from the line levels Π85 V. Bootstrap integrator 14, R5-R7, Cl, C2, acts as a second order Butterworth filter to control pulse flank slope to give trapezoidal pulses. An amplifier comprising a push-pull phase splitter and driver stage follows the filter. A buffer amplifier (not shown) may be interposed between the coupler, and filter. The input signal is of bipolar rectangular form. The arrangement shown is intended to replace a relay/filter isolator circuit, and may be encapsulated. The amplifier may incorporate negative feedback (not shown).
GB3506976A 1977-11-23 1977-11-23 Telegraph transmission Expired GB1537557A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3506976A GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3506976A GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Publications (1)

Publication Number Publication Date
GB1537557A true GB1537557A (en) 1978-12-29

Family

ID=10373433

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3506976A Expired GB1537557A (en) 1977-11-23 1977-11-23 Telegraph transmission

Country Status (1)

Country Link
GB (1) GB1537557A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019920A1 (en) * 1979-05-31 1980-12-10 The Boeing Company Digital data communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0019920A1 (en) * 1979-05-31 1980-12-10 The Boeing Company Digital data communication system

Similar Documents

Publication Publication Date Title
CA1294012C (en) Optical transmitter driver with current peaking
JPS57121345A (en) Pulse noise eliminating circuit
ES285176A1 (en) Transmitter installation for the transmission of pulse signals in a transmission band (Machine-translation by Google Translate, not legally binding)
GB1537557A (en) Telegraph transmission
US5311179A (en) Method for amending the effect of offset voltage variations from the output voltage in a D/A converter
GB1339866A (en) Transmission system
GB935024A (en) Improvements in or relating to automatic correction arrangements for periodic integrators
GB611751A (en) Improvements in or relating to circuits for generating electrical impulses
US3778642A (en) Regenerative switching circuit
GB1225292A (en)
GB1267979A (en) Synchronizing separator circuits
US3358242A (en) Automatic phase control network
JPS57115049A (en) Pulse signal transmitting and receiving circuit
SU481117A2 (en) Low Frequency Pulse Power Amplifier
US2844651A (en) Modulation limiter for multiplex pulse communication systems
KR0175045B1 (en) Frequency Leak Canceller in Balanced Modulators
GB869581A (en) Improvements in or relating to transistor amplifiers
GB1416485A (en) Encoder guard circuit
AU529008B2 (en) Pin diode switches
JPS6448525A (en) Transmission panel
SU1405120A1 (en) Multilevel regenerator of bi-polar signals
SU1100545A1 (en) Receiver of frequency-pulse modulated signals
SU1394428A1 (en) Pulse-frequency modulator
SU1095352A1 (en) Two-step amplifier
SU1277403A1 (en) Device for protection against pulsed interference in receiving frequency-modulated signal

Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee