[time-nuts] Lead acid battery noise levels
tholmes at woh.rr.com
Thu Jul 11 14:21:19 EDT 2013
All three got through; don't know why you are having trouble seeing them.
Tom Holmes, N8ZM
Tipp City, OH
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of ed breya
> Sent: Thursday, July 11, 2013 12:25 PM
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Lead acid battery noise levels
> NiCd batteries should have the lowest noise for their size due to low
> 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
> temperature variation response can appear as very low frequency noise
> independent of the other noise sources and operating conditions. Hg
> so stable that they were commonly used as voltage references or to power
> circuits without any additional regulation needed.
> >Mike Feher wrote:
> A long time ago, when I was concerned about a phase noise issue, I found
> NBS article. It was on measuring phase noise and included a schematic of
> ultra-low noise amplifier. In that amplifier they used Mercury batteries.
> I also glanced at the referenced article, stating NiCad is the lowest
> NiCads were available for a long time, yet they used Mercury. Regards
> - Mike
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