[Boatanchors] Testing a crystal

Bry Carling af4k at hotmail.com
Mon Jul 9 06:47:14 EDT 2018


Tom

AF4K Crystals of course! We can help you with most of your Crystal needs.

If you need certain custom made crystals there’s a guy in Germany also manufacturing and selling them.

Best regards - Brian Carling, AF4K CRYSTALS, USA

http://af4k.com/crystals.htm

Tel: 321-262-5471




On Jul 8, 2018, at 2:39 PM, Tom B <tbryan at nova.org<mailto:tbryan at nova.org>> wrote:

Hi Ian,

Thanks.  I tried it on my network analyzer and got nothing so I think the crystal is absolutely dead.  I didn't want to try this test earlier because I wasn't sure if the crystal would take the power output from the network analyzer, which only goes down to -10 dBm, but is much happier at 0 dBm.  I tried this one another crystal and got exactly the response I would have expected from a good crystal.

Now to buy a crystal.  Too bad National is gone. Quartslab and Bomar are my best bet now.  I am inclined to go with Quartslab. Anybody got any other recommendations?


Tom

On 7/8/2018 9:29 AM, Ian Wilson wrote:
I would aim at keeping the power dissipated in the crystal at or below 10mW.
If the crystal is looking into something like a 50 ohm load then if you
keep the
drive voltage less than 1v or so then this should be safe.

Note that the Q of the crystal is so high that you will not be able to
'land' exactly
on it unless you are using a digital signal generator (and you may have to
watch
the scope trace very closely to see the blip).


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