Hi Mike,

Welcome to the group. When setting the gain you should use the raw data from the A/D 
converter, so you should use the unfiltered data.

Regards,
Larry Cochrane
Redwood City, PSN

Michael Kimzey, D.O. wrote:
> Hi all.
> 
>    I'm new to the group and just wanted to get my feet wet with a post, 
> observations and some questions.  After many years of indecision, I finally 
> made the plunge and built a Lehman.  It is currently operating in a crawl 
> space under the family room.  I thought that it would be somewhat quiet 
> there, but it seems that some poured concrete over dirt isn't that quiet.  
> Additionally, I am 50 feet from a fairly busy road...but I'll take what I 
> can get.
>      With the help of Larry (very helpful and patient with questions), I got 
> the electronics up and running and the rest of the story with pictures can 
> be viewed at http://www.mckimzey.com/seismology.html     I haven't seen any 
> activity yet, but did get a teaser with the recent Alaska quake...would have 
> recorded it but that was the 12 hours that the system was down for some 
> early modifications....hummf.
> 
> Right now I'm oil damped, but hope to make the metal damper.  I have seen 
> that both copper and aluminum are used.  Is either better than the other?  I 
> don't have ready access to copper plate (is it available at Home Depot or 
> Lowes?) so I was going to use a pipe that I flattened.  What kind of 
> thickness is needed?
> 
> I'm running WinSDR and I fiddled around with the gain on the board.  Is 
> there a baseline count that I should aim for...I think that someone put it 
> at around 100 or 200 (boy, that 4th quarter list archive was looong).  Also, 
> does it matter if I display raw or filtered data?  I'm using the default 
> WinSDR settings for alarms and filters.
> 
> Finally,  now that I've got the bug, of course I want more instruments.  I 
> was thinking about the SG sensor, but the volksmeter has my interest piqued. 
>   I heard that it might only be ready-made, but maybe it wouldn't be too 
> difficult to build one.  The upright(s) of aluminum; shaft of aluminum 
> (although the PDF looks like it was made of brass).  The plates could be 
> made of PCB board, etched if needed.  It would just be the electronics that 
> I would need to buy.  One of the things that I find neat about that design 
> is that it probably could be minimized to a size where it could fit in a 6 
> inch tube and be sunk several feet/meters in the ground (with remote motor 
> leveling and such)
> 
> Ok, enough of my ideas.  My ignorance of seismology betrays me.  Any 
> thoughts or ideas would be welcome.  Thanks!
> 
> - Mike

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