## PSN-L Email List Message

Subject: How much gain?
From: tchannel1@............
Date: Mon, 3 Dec 2007 17:37:54 -0700

```Hi Folks,   I am using Larry's board, AmaSeis and Winquake.   I just =
made a new coil and magnet assembly, using 4000 turns of 38 ga. and a =
stack of three ring magnets, each .250 x.750"
This replace a coil of 2000 turns and two magnets .250 x.750"   Larry's =
board in set for the high gain, but with the pot turn all the way down =
to minimum.

My question is what is the best approach to setting the Amp. gain?   =
This new coil arrangement is more powerful the the last one.  Using =
AmaSeis the helicorder gain in 1 or 2, more than that is too much.   I =
know this gain adjustment is just for viewing, and 1 or 2 looks okay.

I could move the jumper on Larry's board to the lower gain level, or I =
could leave it on the higher gain.

I am just looking for some advise as to setting the gain. =20
The best one I heard, was to use a quiet night and set the gain to show =
none or just a little back ground noise.

Hi Folks,   I am using =
Larry's board,=20
AmaSeis and Winquake.   I just made a new coil and magnet =
assembly,=20
using 4000 turns of 38 ga. and a stack of three ring magnets, each .250=20
x.750"
This replace a coil of 2000 turns and =
two magnets=20
..250 x.750"   Larry's board in set for the high gain, but with =
the pot=20
turn all the way down to minimum.

My question is what is the best =
approach to setting=20
the Amp. gain?   This new coil arrangement is more powerful =
the the=20
last one.  Using AmaSeis the helicorder gain in 1 or 2, more than =
that is=20
too much.   I know this gain adjustment is just for viewing, =
and 1 or=20
2 looks okay.

I could move the jumper on Larry's =
board to the=20
lower gain level, or I could leave it on the higher gain.

I am just looking for some advise as to =
setting the=20
gain.
The best one I heard, was to use a =
quiet night and=20
set the gain to show none or just a little back ground =
noise.

Thanks, Ted
```