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DF 40 Wired Radio Receiver



It was in 1881 that Clément Ader began trials in Paris to transmit theatre and opera performances via the telephone lines (Théâtrophone), one of the attractions at the 1889 Paris World Exhibition. This “telephone broadcast” quickly spread to many cities of Europe and America. By making a telephone connection to the exchange, it was possible to hear music or news. Tivadar Puskás launched a commercially successful “pay radio” (“Telefon Hirmondó” or “Telephone Herald”) service in Budapest that ran from 1893 to 1944, with around 1200 km of wires and 9107 subscribers at its peak. The system was modified following the rise of high-frequency radio technology. A radio signal was fed into the lines that could be separated using a filter (as with DSL) and heard on a radio receiver.

 
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