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Roy Frettsome, G4WPW

Roy Frettsome's reproduction Bijouphone crystal radio.


Roy Frettsome's reproduction Bijouphone crystal radio, close-up view.





Roy Frettsome's Australian mystery crystal radio, front.


Roy Frettsome's Australian mystery crystal radio, side.


Roy Frettsome's 1925 Popular Wireless design crystal radio.


How to Make a Variometer Crystal Set - Popular Wireless 1925, Page 1
How to Make a Variometer Crystal Set - Popular Wireless 1925, Page 2


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Copyright 2009, Geoff Roberts, geoff.beltane@btopenworld.com