KE9EX wrote:
I read here or somewhere about how to translate the numbers stamped on
a FT-243 Crystal
to be able to tell the Crystal's Frequency. I have some with these
numbers stamped on them,
and want to be certain of the frequency, since the ink with the exact
Frequency has long since faded. TNX ex 73, Mike


Hi,

I wouldn't trust the crystal holder channel number to determine the
operating frequency.
It was very common after the war to reuse holders with different
crystal blanks. I've got a few here with paper labels giving
the actual crystal frequency, which has nothing to do with
the channel number embossed on the crystal holder.

Many surplus crystals were reground and mounted in the old holders,
here is a web site showing the technique used:
http://www.subdevo.com:82/n4jvp/crys...alGrinding.htm

73,
Ed Knobloch