From: "Poul-Henning Kamp" <[EMAIL PROTECTED]> Subject: Re: [time-nuts] Thought experiment on a low cost timing board Date: Sat, 25 Feb 2006 19:11:15 +0000 Message-ID: <[EMAIL PROTECTED]>
> In message <[EMAIL PROTECTED]>, 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. Cheers, Magnus _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
