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Postcard Radio Signature Item


latvija
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I have been contemplating a signature item and am intrigued by making a geocaching-themed postcard radio kit like those sold at Bletchley Park here.

 

Anyone know where a basic set of instructions and parts can be found. My Googling for "postcard radio" and browsing through several xtal set sites didn't turn up anything.

 

Thanks.

 

latvija

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