PSN-L Email List Message
Subject: Re: Gain problem
From: "Michael Kimzey" mckimzey@...........
Date: Wed, 28 Feb 2007 06:41:14 -0500
Jon,
>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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