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The famous radio designer and radio amateur V. Polyakov RA3AAE is known for his original developments. The video tells about a simple receiver for medium and long waves, the supply voltage for which is taken from the energy of the signal itself. http://archive.radio.ru/web/2000/07/021/ http://archive.radio.ru/web/2000/07/022/ http://www.irls.narod.ru/pru/pru33.htm