HI Ed... All three got through; don't know why you are having trouble seeing them.
Tom Holmes, N8ZM Tipp City, OH EM79 > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of ed breya > Sent: Thursday, July 11, 2013 12:25 PM > To: [email protected] > Subject: Re: [time-nuts] Lead acid battery noise levels > > NiCd batteries should have the lowest noise for their size due to low resistance, > but if you look at ever-lower frequency, the Hg should be superior since it has the > most stable voltage with time and temperature. Drift (including self-discharge) and > temperature variation response can appear as very low frequency noise > independent of the other noise sources and operating conditions. Hg batteries are > so stable that they were commonly used as voltage references or to power small > circuits without any additional regulation needed. > > Ed > > > >Mike Feher wrote: > > A long time ago, when I was concerned about a phase noise issue, I found an old > NBS article. It was on measuring phase noise and included a schematic of an > ultra-low noise amplifier. In that amplifier they used Mercury batteries. > I also glanced at the referenced article, stating NiCad is the lowest noise, and, > NiCads were available for a long time, yet they used Mercury. Regards > - Mike > > > > > > > > > > > > _______________________________________________ > 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.
