History of radio ( 21 ) :

• Recognizing Some of the Many Contributions to the Early Development of Wireless Telegraphy: a valuable and well balanced analysis of the controversial early years of radio by Leonid Kryzhanovsky and James P. Rybak.
• Chapter I: A Brief Historical Review from The Outline of Radio by John V. L. Hogan -- a very informative history written in 1923 and edited by John H. Dilks for the New Jersey Antique Radio Club.
• 100 Years of Radio: a history which emphasizes the role of Marconi in radio.
• Hammond Museum of Radio Home Page: links to an interesting collection of radio memorabilia.
• Radio Museum Rottenburg -Radio Pictures: the museum's collection radio pictures.
• Radio Museum Rottenburg - Links to Radios:  links to other radio web sites.
• Surfing the Aether-Radio & Broadcasting Technology History:
• Adventures in CyberSound:  Russell Naughton's outstanding collection of links, radio pictures and biographies.
   
• World of Wireless - History:
   
• Wireless Communication:
• FLIWH - Friends of Long Island Wireless History: home page an organization dedicated to preserving the historic Sayville (Telefunken) Wireless Station.  There are lots of links to other radio history web sites.
• NDT (Non-ducting Tropospheric Propagation): The history of VHF propagation beyond line of sight by Howard Oakley.

Spark gap transmitters

• Early Wireless -- Spark Coils: an explanation of how spark coils formed the heart of the earliest radio transmitters.
• Spark - Gap: a brief history by Art Marshall (WLFJI) in Tallahassee, Florida
• A "Quenched" Spark Gap of Unknown Make: a excellent discussion of spark gap transmitters linked from The Telegraph Office.
• Spark Keys: a review of solutions to a difficult problem linked from The Telegraph Office.
• Amalgamated Wireless Australasia (AWA) 1/2KW Spark Gap Transmitter and Receiver
   

Arc transmitters

• The Poulsen Arc Transmitter: is an abtract of a thesis by Hans Buhl which describes the invention and development of the Poulsen System in Denmark, England and the United States.

Early wireless detectors

• Detectors of Electric Oscillation
• The Coherer:  is a brief introduction to coherer technology.
• Marconi Coherer (1895 - 1905) see also Guglielmo Marconi Il Coesore o Coherer e l'antenna.

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