The Smaller The Bandwidth the lower the noise. Id recommend you try 4 seconds to your highest non-alising freq. But your electronics 
needs to match your
hardware and I do not know unless
you build your own how to deal with that.


----- Original Message ----- 
From: 
To: "psn" 
Sent: Monday, May 26, 2008 7:29 AM
Subject: Adjusting the period


Hi  Folks,  I have a Lehman set to 20 seconds..........It seems to be working okay and I don't think it needs any modifications.  It 
records the same as other Lehmans I have worked with.

I plan on changing the period from 20 seconds to another number, not sure what that number will be.   What I want to see, is how it 
records at different period settings.

I know the advantages of the 20 seconds.  The disadvantage is it misses many other smaller earthquakes.

My question:  Before I try other period numbers..........Have you tried this, and what were the results?

I really don't know what the result would be.

Thanks, Ted 

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