1. 
   KDKA
   (from the article `Pennsylvania`) ...and Country Gentleman. Andrew Carnegie of Pittsburgh was noted for the establishment of libraries throughout the country. The world`s first ... ...in the number of listeners in turn justified the establishment of stations especially for the purpose of broadcastin...
   Found op http://www.britannica.com/eb/a-z/k/17
   
   
2. 
   KDKA
   [AM] KDKA (1020 kHz) is a radio station licensed to Pittsburgh, Pennsylvania, USA. Created by the Westinghouse Electric Corporation on November 2, 1920, it is the world`s first commercial radio station, a distinction that has also been challenged by other stations, although it has claimed to...
   Found op http://en.wikipedia.org/wiki/KDKA_(AM)
   
   
3. 
   kdka
   1) First commercial u.s. radio station, located in pittsburgh
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/kdka/1
   
   

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