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
Mike B. Feher, EOZ Inc. 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 office 908-902-3831 cell -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of David Kirkby Sent: Thursday, July 11, 2013 10:25 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lead acid battery noise levels On 11 July 2013 05:47, Mark Spencer <[email protected]> wrote: > Eric: > > http://tf.nist.gov/general/pdf/1133.pdf > > discusses the noise levels of various batteries. > > Regards > Mark S Sod's Law comes into play here. From a quick read of that, it seems NiCd are best, but they are being phased out. I was told they were banned in Europe, but I don't know if that is true. I'm pretty sure I've seen NiCd tools in the local DIY store, so I doubt it is true. Dave _______________________________________________ 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.
