[time-nuts] Using Allan Plots, was(LPRO-101 with Brooks Shera's GPS locking circuit)

Magnus Danielson cfmd at bredband.net
Mon Dec 18 06:29:56 EST 2006


From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
Subject: Re: [time-nuts] Using Allan Plots, was(LPRO-101 with Brooks Shera's GPS locking circuit) 
Date: Mon, 18 Dec 2006 11:09:42 +0000
Message-ID: <41089.1166440182 at critter.freebsd.dk>

> In message <20061218.112305.1155416385.cfmd at bredband.net>, Magnus Danielson wri
> tes:
> 
> >The quickest way to disclose crosstalk as an issue is to
> >have two stable sources be near beating while logging the timings. One of these
> >may be the time-base.
> 
> I have used such a "vernier" setup to measure stuff in the FreeBSD kernel
> and once you get the setup right, the reproducibility is very good.
> But until then your numbers will look very random.

Indeed. This also explains why I had an extra 5 MHz OCXO with me to the summer
house. I had a counter to debug and could just not leave it alone for two
weeks.

Come to think of it, my summer house doesn't have a GPS antenna yeat. It's
quite close to you actually.

Cheers,
Magnus



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