Tikker

Tikker

A tikker was a device that allowed early crystal radio circuits to detect continuous-wave telegraphy. Ordinary crystal detectors cannot demodulate continuous waves; the direct current (DC) signal is inaudible in headphones.[1] One form of the tikker consisted of a fine wire resting on a rotating drum, which interrupted the DC voltage to produce an audible tone.[2]

The tikker was invented in 1908 by Valdemar Poulsen and Peder Oluf Pedersen. Poulsen also experimented with using the tikker to send speech with spark gap transmitters such as the arc converter. [3] Poulsen is perhaps best known for developments in magnetic recording.

References

  1. ^ K. G. Beauchamp,History of telegraphy, IET, 2001 ISBN 0852967926, page 201
  2. ^ Popular Science Apr 1916 page 627
  3. ^ Carroll W. Pursell, Technology in America: a history of individuals and ideas, page 195

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • tikker — noun or ticker ˈtikə(r) ( s) Etymology: tikker alteration of ticker (I) : a form of interrupter used in the early days of radio as a detector of continuous waves consisting of a rapidly rotating wheel and a fine wire brush with the current made… …   Useful english dictionary

  • tikker — tik·ker …   English syllables

  • Kriegstelegraph [3] — Kriegstelegraph. Bei Beginn des Weltkrieges hielt man die technische Entwicklung des Nachrichtengerätes der deutschen Truppen im allgemeinen für abgeschlossen. Man ging von der Annahme aus, daß man mit dem Fernsprecher und der drahtlosen… …   Lexikon der gesamten Technik

  • Telegraph [1] — Telegraph (Fernschreiber), Vorrichtung zur Nachrichtenbeförderung, welche den an einem Orte zum sinnlichen Ausdruck gebrachten Gedanken an einem entfernten Orte wahrnehmbar wieder erzeugt, ohne daß der Transport eines Gegenstandes mit der… …   Lexikon der gesamten Technik

  • Continuous wave — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Peder Oluf Pedersen — Born 19 June 1874(1874 06 19) Sig …   Wikipedia

  • Detector (radio) — Passband modulation v · d · e Analog modulation AM · …   Wikipedia

  • Heine-Velox — was an extremely expensive and massive luxury car made by Gustav Heine. Heine Piano Company was originally Bruenn Piano Company before Heine became owner. All were based in San Francisco. Piano Business Gustav Otto Ludolf Heine was born near… …   Wikipedia

  • Bill Davis (artist) — William Robert Davis, aka Bill Davis (b. May 1949 in Venice, California) is an American illustrator, animation director and designer, graphic designer and painter. Davis is the founder and creative director of Mother Productions, a graphic design …   Wikipedia

  • Jan Siebelink — Infobox Writer name = Jan Siebelink imagesize = caption = pseudonym = birthname = birthdate = 13 February 1938 birthplace = Velp, Netherlands occupation = Teacher, author nationality = Dutch ethnicity = citizenship = education = alma mater =… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”