Hi Roger,
The FFT used the tool in WinQuake. And for the FFT plot I simply selected
the trace that was displayed, so I did use filtered data (I'm assuming
WinQuake uses the data displayed). The filter I'm using is a low pass of
..08Hz and a high pass of .02Hz. I am using 100 sps. 



-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of RSparks
Sent: Friday, February 26, 2010 5:19 AM
To: psn-l@..............
Subject: Re: Digest from 02/25/2010 00:00:36

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:
> .------ ------ ------ ------ ------ ------ ------ ------ ------ ------.
> | Message 1                                                           |
> '------ ------ ------ ------ ------ ------ ------ ------ ------ ------'
> Subject: Another FBV Seismometer
> From:    "Gary Lindgren"
> Date:    Thu, 25 Feb 2010 20:11:31 -0800
>
> This is a multi-part message in MIME format.
>
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> 	charset="us-ascii"
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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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