Here's a new medium-length article on construction, listening, & contesting over at The SWLing Post blog. I had no idea that there is currently all of this activity around design and long-distance listening with crystal radios. Requiring no power beyond what the antenna gathers, they continue to amaze and fascinate.
Interior pic of Marcellus Wallace's briefcase.
Related topics previously covered here at the 'swamp: 100 Years of KDKA (with an amusing story), Crystal Radio Build, and Minimalist Radio.
ps: Some time back a research group used – of course – a genetic algorithm to optimize a basic crystal radio design. Paper from 2008 here. Very little on the resulting radio, mostly it's about the GA algorithm developed and how it performed. The circuit just seem to have been a convenient test case.
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