[time-nuts] Interesting looking crystal on ebay

[Bob Camp]

Hi

Ok, so you have what may be anti-resonance about 23 ppm above 10 MHz. Exactly what that works out to in a circuit depends a lot on the stray C in your fixture. 

The next step would be to look at ~ 3.333 MHz to see if it's a third overtone crystal.

Bob

On Mar 12, 2013, at 1:49 AM, Robert Darlington <rdarlington at gmail.com> wrote:

> I ended up buying this as I've wanted one for a while.  It arrived today
> and I swept it with the network analyzer. At whatever temperature my shop
> was at the time I took the measurement, it had a sharp insertion loss at
> 10.000233MHz.  Pretty cool.   I can post plots if there is any interest or
> just email to individuals off list.
> 
> -Bob
> 
> 
> On Thu, Mar 7, 2013 at 3:50 AM, David Kirkby <david.kirkby at onetel.net>wrote:
> 
>> This is certainly not time-nut standard, but I've never personally
>> seen a crystal like this.
>> 
>> 
>> http://www.ebay.com/itm/BLILEY-QUARTZ-BG6-GLASS-ENVELOPE-RESONATOR-FREQUENCY-10-MHz-AT-cut-/251231707166
>> 
>> I guess it has so many pins so it fits in a valve base.
>> 
>> Dave
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