Hi The +12 volts is what you want to keep stable. You would like to keep them all reasonably clean. That's not to hard for -12 since there's next to no current on it. +5 is mostly digital logic, it generates it's own suprs and noise. +12 runs the OCXO and it's internal regulators, it's likely all analog.
The issue here isn't as much ultra clean as stable. A well regulated supply on the +12 will give you better performance out of the TBolt. The OCXO does indeed change frequency when the +12 changes. I posted some data a while back. Bob On Feb 15, 2011, at 7:40 AM, Brendan Minish wrote: > On Tue, 2011-02-15 at 10:47 +0100, Magnus Danielson wrote: > >> This has gone overboard. The T-bolt generates digital noise all by >> itself. It's the OCXO which would benefit most from a clean supply and >> isolation from the rest of the T-bolt except that temp-sensor. > > Considering the T-bolt has 3 supplies which rail is the one that is most > important to keep clean > My main interest is the best possible phase noise and spur performance > as the 10MHz output is feeding a high quality SDR > >> Providing ultra-clean supplies to the digital logic would be overkill, >> as it would mess it up itself anyway. > > I guess what I am wondering, considering I already have a very low > noise, stable, battery backed 12V (13.8V really) system in the shack can > I use that along with a small dual rail DC-DC converter and still get > very good performance > > > -- > 73 > Brendan EI6IZ > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
