[Boatanchors] Testing a crystal

[Gary Schafer]

The network analyzer may miss it depending on how much spread you have it
set to. Most analyzers go in steps.

73
Gary  K4FMX

> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
> bounces at mailman.qth.net] On Behalf Of Tom B
> Sent: Sunday, July 08, 2018 1:40 PM
> To: Ian Wilson
> Cc: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Testing a crystal
> 
> 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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