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.
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----- Original Message -----
From: "ed breya" <[email protected]>
To: <[email protected]>
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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