Re: xtals


From: Alan Kaul (
Date: Sun Feb 11 1996 - 14:00:24 EST

Many, many years ago when I was a novice (KN7EHW---1958) and had to use
crystals, I remember altering the frequency: making them
increase in frequency by grinding, and making them decrease in frequency
by adding a thin layer of pencil lead. The xtal types were FT243 as I
recall (made by Texas Xtals, Petersen Radio, and various surplus houses).
They had three Philips-type screws on the case which could
be removed. One had to be very careful when handling the quartz wafer.
(If I remember correctly, the abrasive used for grinding was a little
bit of Bon-Ami powdered cleanser!)
Good luck and and if you try it, let us know how it works!

                     [<Alan Kaul, W6RCL>]

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