I have a copy of " Understanding Amateur Radio" published by the ARRL
in 1963. One of the appendixes is titled "Changing Crystal Frequencies"
and talks about grinding crystals from FT-243 holders.
Just google on < "ft-243" crystal grinding > and you'll find lots of web
pages and at least one YouTube hit.
Ed
On 6/20/2013 8:06 PM, Hal Murray wrote:
n...@lazygranch.com said:
A common scheme in metal deposition measurement is to measure the frequency
of a crystal prior to starting the deposition process, then monitoring the
frequency shift of the crystal as the metal is sputtered.
I was told crystals are tuned this way at the factory, but don't know this
for a fact.
I don't have any good references, but I've seen that story several times, and
at least some of them were credible enough so that my opinion changed from
sounds-good to really-works.
-------
Many years ago (50+), I remember stories of grinding or leading crystals. I
remember taking one apart. It was only a few screws. Does anybody have an
ARRL handbook from that era?
Does anybody have any estimates on what the performance of a hermetically
sealed crystal is compared to an old non-sealed mounting? (Do they still
make the old non-sealed mounting?)
I also remember getting several crystals cut to order, one each for me and a
few friends. That was through the local radio/TV fixit parts store, a block
or two from the high school.
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