GB540888A - Improvements in keying arrangements for radio and like systems - Google Patents

Improvements in keying arrangements for radio and like systems

Info

Publication number
GB540888A
GB540888A GB6057/40A GB605740A GB540888A GB 540888 A GB540888 A GB 540888A GB 6057/40 A GB6057/40 A GB 6057/40A GB 605740 A GB605740 A GB 605740A GB 540888 A GB540888 A GB 540888A
Authority
GB
United Kingdom
Prior art keywords
resistance
grid
anode
keying
cathode
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
GB6057/40A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi Co 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB6057/40A priority Critical patent/GB540888A/en
Priority to US390505A priority patent/US2283724A/en
Publication of GB540888A publication Critical patent/GB540888A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)
  • Circuits Of Receivers In General (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

540,888. Wireless transmitting systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and COOPER, V. J. April 3, 1940, No. 6057. [Class 40 (v)] A keying circuit for radio and like transmitters, designed to prevent key clicks, comprises a valve V1 with a resistance-shunted capacity R2C2 in its grid-cathode circuit to which the keying-voltage is supplied through a resistance R3 by a voltage source and keying-contacts across the terminals Vin. When the key is closed negative potential is gradually applied to the grid owing to the retarding effect of the resistance R3 and condenser C2. The anode and screen-grid currents fall to zero, and the cathode resistance R1 becomes ineffective in biasing the grid. When the key is opened the condenser C2 discharges gradually through the resistance R2, the valve current gradually rises, and the cathode resistance R1 tends to bias the grid negatively, thus further delaying the rise of anode current. The screen grid G2 is supplied from the anode source by a potentiometer R5 or through a series resistance. The rounded output impulses are taken off across a resistance R4 in the anode circuit, and applied to interrupt the carrier.
GB6057/40A 1940-04-03 1940-04-03 Improvements in keying arrangements for radio and like systems Expired GB540888A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB6057/40A GB540888A (en) 1940-04-03 1940-04-03 Improvements in keying arrangements for radio and like systems
US390505A US2283724A (en) 1940-04-03 1941-04-26 Keying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6057/40A GB540888A (en) 1940-04-03 1940-04-03 Improvements in keying arrangements for radio and like systems

Publications (1)

Publication Number Publication Date
GB540888A true GB540888A (en) 1941-11-04

Family

ID=9807623

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6057/40A Expired GB540888A (en) 1940-04-03 1940-04-03 Improvements in keying arrangements for radio and like systems

Country Status (2)

Country Link
US (1) US2283724A (en)
GB (1) GB540888A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332036A (en) * 1964-04-17 1967-07-18 Ohio Crankshaft Co High frequency electrical power source with pulsating control

Also Published As

Publication number Publication date
US2283724A (en) 1942-05-19

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