On 3/13/17 11:29 AM, Tim Shoppa wrote:
With a chunk of raw crystal material and a lapidary saw, blanks can be cut.
Typical FT-243/U crystal construction technology up through the 1950's:
http://www.rfcafe.com/references/popular-electronics/after-class-Quartz-Crystals-january-1957-popular-electronics.htm
It was very common for hams to regrind crystals for other nearby
frequencies at home:
http://www.bliley.net/XTAL/docs/misc/XTAL_grinding/grinding.html
"Grinding your own crystals can be lots of fun, and you can have the
freedom of a v.f.o. without the danger of a pink ticket."
why, it's as simple as spinning the knob on the VFO<grin>
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