[time-nuts] Bye-Bye Crystals

[Tim Shoppa]

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

I have a large assortment of 50's/60's/early 70's FT-243 crystals and they
are uniformly crummy from a Q or frequency accuracy perspective. Sometimes
opening the holder and cleaning the electrodes and crystal helps a bit -
there's some attempt at sealing, like a rubber grommet, in some of the
FT-243 holders but mostly there's no attempt at sealing. It's possible the
rubber grommets just made things worse through outgassing.

Tim N3QE



On Mon, Mar 13, 2017 at 11:01 AM, Adrian Godwin <artgodwin at gmail.com> wrote:

> The article mentions that the business started in his father's garage.
>
> What minimal equipment would you need to make your own crystals ?
>
>
> On Mon, Mar 13, 2017 at 2:11 PM, Van Horn, David <
> david.vanhorn at backcountryaccess.com> wrote:
>
> >
> > Probably true for many things.   My current design has six crystals, and
> > exactly none of them could be replaced by an oscillator module.
> > Power and space considerations mostly.
> >
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