Roy Frettsome, G4WPW

Bijouphone Replical Crystal Radio

Roy Frettsome's reproduction Bijouphone crystal radio.

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

Australian Style Crystal Radio

Roy Frettsome's Australian mystery crystal radio, front.

Roy Frettsome's Australian mystery crystal radio, side.

Australian Style Crystal Radio

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