PSN-L Email List Message
Subject: Re: Noobie Greetings
From: Larry Cochrane lcochrane@..............
Date: Wed, 17 Jan 2007 02:11:30 -0800
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.
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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