Hi Mike, Congratulations on a nice design,   I build two Lehman's and a 
Vertical,  email me if you would like to see pictures as I have no way to 
post them.   Your Lehman should work great.  My Lehman is in the basements 
and I pick up Earthquakes fine, but also pick up road construction, digging 
in the earth.  I do not pick up any traffic, not even trucks, just weather, 
cold fronts, and the city daytime noises.
I also used a ball bearing on my arm, but retained it between two drill bit 
shanks.  The ball ride in between the two cylinders so it does not move up 
or down out of the small "V" formed by the shanks.   Let us know when you 
record your first event and maybe you will post them on .PSN
EVENTS.   Ted
----- Original Message ----- 
From: "Michael Kimzey, D.O." 
To: 
Sent: Tuesday, January 16, 2007 6:51 PM
Subject: Noobie Greetings


> 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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