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
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.
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
> 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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