Wow, what a beautiful piece of work! And a fascinating story behind it, with hints of wartime romance… Thanks to Mike AA1TJ whose very eclectic reading (Czech tech mags!) led us to this. Thanks also the Crypto Museum. Here is the link:
http://www.cryptomuseum.com/spy/sweetheart/index.htm
With more info here:
http://antiqueradios.com/forums/viewtopic.php?t=96007
And here:
http://antiqueradios.com/forums/viewtopic.php?t=96057
Our book: “SolderSmoke — Global Adventures in Wireless Electronics”http://soldersmoke.com/book.htmOur coffee mugs, T-Shirts, bumper stickers: http://www.cafepress.com/SolderSmokeOur Book Store: http://astore.amazon.com/contracross-20
I love these little clandestine radios – ingenious solutions in a neat little package. Would love to see some kits based on the Sweetheart & the other radios like the postwar German FE-8 Receiver and the FS-7 Transmitter.
1T4s are in stock at $2.80 at Antique Electronic supply…They have 100 pf variables too.