[time-nuts] Lead acid battery noise levels

[Max Robinson]

Ed.  I for one am getting all of your messages.  Perhaps your spam filter is 
taking them out for some reason.

Regards.

Max.  K 4 O DS.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "ed breya" <eb at telight.com>
To: <time-nuts at febo.com>
Sent: Thursday, July 11, 2013 11:39 AM
Subject: Re: [time-nuts] Lead acid battery noise levels


> Third attempt at emailing again:
>
> 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
> >
>
>
>
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