PSN-L Email List Message

Subject: Re: WinSDR settings for Mark Products 4.5 Hz 3 Component L15B Sensor
From: Larry Cochrane lcochrane@..............
Date: Sat, 23 Dec 2006 15:03:21 -0800


Hi Dave,

There is no need to use a high-pass filter with a 4.5Hz sensor since there is no low 
frequency information that you should need to filter out. For the low-pass filter you 
could use a 4 pole 2 or 3 hz filter to filter out some of the local ground noise.

Regards,
Larry Cochrane
Redwood City, PSN


Dave Willey wrote:
> Hi Everyone,
> 
> After spending way too much time beating myself up trying to setup the 
> WinSDR's filters, I want to ask the group for pointers.
> 
> My setup includes 3 axis Mark L15B 4.5Hz sensors, Larry's A/D & filter 
> boards.
> 
> Where I'm at is in the suburbs of Santa Rosa California, with some 
> local  street traffic a few hundred feet, and some nearby highway 
> traffic  1/2 mile away.  (So I know it's not ideal.  But that's what 
> I've got to work with.)
> 
> What I'm aiming for is local activity around 200 miles out. No 
> teleseismic stuff yet. (I have an unused 4th channel on the board 
> earmarked for this someday.)  I'm just about 25 miles south from the 
> geothermal fields here in Northern California,  So there's just about 
> always something to watch everyday. (Besides auto traffic!  If I can get 
> this dialed in better.)
> 
> Specifically. How do folks have their low / hi pass filters set? 
> (Specific freq & number of poles would be a REAL help.)  Just as a 
> starting point.
> 
> Anything I missed in the setup I should be concerned with?
> 
> Any other questions about my setup please feel free to ask.
> 
> 
> Thanks for the help in advance.
> 
> 
> Dave Willey
> 
> 
> 
> 
> 

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