[Milsurplus] Crystal History Book and tips on etching

[Dennis Monticelli]

Yes, Ken.  Re-squaring the edges (two adjoining) does help sometimes, but
not always.  I suspect as you say it's due to rounding of the edges. The
etch would of course preferentially attack those right angles.  The mode of
oscillation is sheer-thickness in an AT cut, which means the thickness
determines the frequency but the blank moves laterally (via shear force).
If something mechanically interferes with that shear, the Q will go down.
This is why the plates of the crystal holder have slightly raised corners.

Dennis AE6C

On Mon, Aug 1, 2022 at 1:33 PM <hwhall at compuserve.com> wrote:

> >
> I HAVE found that when activity of an etched crystal drops, that activity
> can be restored about
> 50% of the time by grinding all 4 edges, then recleaning.
> >
>
> Do you bevel the edges & if so, do you bevel on just one face or both?
>
> Wayne
> WB4OGM
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20220801/81851ce3/attachment.html>