PSN-L Email List Message

Subject: Re: Gain problem
From: "Michael Kimzey" mckimzey@...........
Date: Wed, 28 Feb 2007 06:41:14 -0500


>I am not sure how I can turn the gain up properly, so I
>can have my system more sensitive to earthquakes. Since I don't have
>geophones are low gains. I don't know what direction to turn this to get
>the gain up, but not to get it too high and since this turns full circle,
>it is hard for me to tell when I am at minimum and when I am at fairly
>high gain.

  I had the same questions when I received my board.  You can try the 
following:  take a small screwdriver (a jewelers screwdriver) and set the 
pot nearest the jumper to minimum by turning counter-clockwise gently.  The 
pots are 20-turn, and when you reach the end, you will feel a 
click-click-click to know that you reached the end.  I then adjusted the 
pots up until the max and min were around +100 / -100.  This is a very 
unscientific way that I did it.  I think that Larry has directions for 
accurately determining the gain, but I don't have access to the test 
equipment required.

While I'm posting - two questions for the group:

1) does anyone know of the status of the Volksmeter.  I had heard that maybe 
sometime early in 2007 there might be it's debut.  Is there a release date?

2) I have been reading about the STM-8 vertical at the site and in the 
aggregate emails at PSN.  How specific does one have to be with the voice 
coil?  I can't fine the Radio Shack models.  Would any subwoofer work, or 
would there be significant electronic modifications needed if one used 
another subwoofer?

- Mike


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