[time-nuts] Thought experiment on a low cost timing board

Magnus Danielson cfmd at bredband.net
Sat Feb 25 22:30:23 EST 2006

From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
Subject: Re: [time-nuts] Thought experiment on a low cost timing board 
Date: Sat, 25 Feb 2006 19:11:15 +0000
Message-ID: <5374.1140894675 at critter.freebsd.dk>

> In message <20060225.120955.29271924.cfmd at bredband.net>, Magnus Danielson writes:
> >> Consider adding a D/A converter for tweaking OCXO.  Using the two-tier
> >> trick which SRS uses in the PRS10 may be a good and cheap way.
> >
> >two-tier trick? Lacking the PRS10 schematics/service manuals...
> They have two 12 bit D/As which are summed through a 1:1000 network
> to give around 20 bits of effective resolution at the cost of some
> discontinuities.
> Because the ratio is only a quarter of the full ratio of the individual
> D/A's, they can always center the interresting range in the lower D/A's
> range.

OK, thanks. Now I know what you mean.

After a round of calibration it should work pretty well.


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