AF4K Early Radio Experiences
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CQ MAGAZINE for NOVEMBER 1955
A RECEIVER VARRIABLE SELECTIVITY ADAPTER
USING FT-241 SURPLUS CRYSTALS
*IF* YOU HAVE THE RIGHT ONES!
I hope this article is helpful. 73s to all!
Bry Carling, AF4K
Crystal Lapping Machines -typical of the kind I used to work with at Cathodeon Crystals.