I think the TAPR supply was selected on cost and availabilty, not perfomance. I seem to recall reliability problems too. I'd test it with a good linear PSU before putting blame on the Tbolt! Robert G8RPI.
--- On Tue, 9/3/10, Christophe Huygens <christophe.huyg...@cs.kuleuven.ac.be> wrote: From: Christophe Huygens <christophe.huyg...@cs.kuleuven.ac.be> Subject: Re: [time-nuts] Realistic Tbolt phase noise To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Date: Tuesday, 9 March, 2010, 12:50 This is with the power supply as provided by TAPR so should be ok. Xtof. On 09/03/10 13:44, Bob Camp wrote: > Hi > > Power supply noise would be the first thought. > > Next up would be grounding inside the Thunderbolt (card to case, connectors > to case). > > Bob > > > On Mar 9, 2010, at 7:32 AM, Christophe Huygens wrote: > > >> Hi, >> >> I noticed several vendors on Ebay have the t-bolt on sale. >> >> However, the once showing their own PN plots seem to get only >> -115, -120 dBc/Hz at 100Hz. Yet, >> http://www.leapsecond.com/pages/tbolt/noise.htm seems >> to have mucht better results: up to -150 depending on >> power supply. >> >> By multiplying to 1GHz I also seem to be getting something >> like -75 or - 80 rather than -110. >> >> Any thoughts? >> >> Christophe >> on4iy >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.