Hi Gary,

Congratulations on your efforts.  I always admire good workmanship and 
that is what is displayed here on several fronts.  Thanks for making the 
web site available.

I am curious about your FFTs.  I assume that the source data was not 
filtered with software.  Did you use WinQuake to generate the FFT 
displays?  Your sample rate must have been near 100 sps?

Roger

On 02-26-2010 12:00 AM, psn-l-digest-request@.............. wrote:
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> Subject: Another FBV Seismometer
> From:    "Gary Lindgren"
> Date:    Thu, 25 Feb 2010 20:11:31 -0800
>
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> In August of 2008 I started to get interested in the Force Balance Vertical
> Seismometer design that Dave Nelson and Brett Nordgren were putting
> together. I completed my version of this fabulous seismometer in early
> December of last year. I put together a web site that describes the process
> I went through to achieve the end result. See
> http://sites.google.com/site/seismicsensorinfo/Home  Any feedback is most
> welcome.
>
> Gary
>
>
>
>    
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