[time-nuts] On some pitfalls of the dual mixer time differencemethod of h...

Magnus Danielson cfmd at bredband.net
Mon Oct 2 19:17:39 UTC 2006


From: Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz>
Subject: Re: [time-nuts] On some pitfalls of the dual mixer time differencemethod of h...
Date: Mon, 02 Oct 2006 12:25:46 +1300
Message-ID: <45204E7A.8020406 at xtra.co.nz>

Bruce,

> Interesting as the techniques employed may be, the resultant performance 
> is still inadequate for characterising state of the art oscillators.
> The instrument phase noise floor is higher than that specified for 
> current low noise (but not necessarily low drift) crystal oscillators.
> 
> The Allan deviation of current state of the art cryogenic sapphire 
> oscillators is more than an order of magnitude lower than the noise 
> floor of these instruments.

Yes, but remember that we still have 99.99999% or so of oscillators covered
with these methods. There ain't no such thing as a free lunch, and any aspect
of precission timing fits the bill perfectly.

Cheers,
Magnus




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