The thunderbolts produce status information and error estimates about how
they are doing.  If you are willing to trust that, you can remove the one
that is falling out of tolerance.  If you aren't willing to trust that, then
I'm pretty sure you'll need a third frequency standard to compare each to.

Thanks,
-JP
On Wed, Oct 19, 2011 at 3:46 PM, David VanHorn <[email protected]
> wrote:

>
> I have two thunderbolts, set up so that I can switch over to the backup
> unit if the primary fails.
> All is well with that, but what could I do to detect a less obvious
> failure, like 9.999999 MHz output?
>
> If they disagree, I don't know how to resolve which is correct.
>
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