Frank,
I highly recommend Larry's A-D board and software. It has been a very
reliable system for us for the past 15 months, and we are looking into =
the
feasibility of converting many of the remote paper drum OGS sites to =
digital
using the same system.
We are in an urban setting only one mile from a major interstate =
highway, so
the filters in our location are very beneficial. Currently the gain for
OCO2Z is 545 with a 1 Hz 8-pole lp filter, and 100 second 1-pole hp =
filter.
We are in the process of constructing a new thermally stable =
underground
seismometer vault, and will most likely remove the hp filter after
installation.

Greg Christenson=20
NEIC station code OCO=20
Omniplex Science Museum=20
http://www.omniplex.org/OCOdata=20



-----Original Message-----
From: Frank Gentges K=D8BRA [mailto:fgentges@..................
Sent: Tuesday, May 27, 2003 4:28 PM
To: psn-l@..............
Subject: RE: Teledyne Geotech BB13 Seismometer


Greg,

Nice to hear from you.  I picked up your site on a Google search for =
the=20
BB13.  I try to drop by each day to see the seismic activity at OCO.

I saw the recent Virginia event and I think I saw the big event in =
Algeria=20
although the times don't seem quite right.

It looks like a nice museum display you have set up there.  I might try =
to=20
drop by sometime.  I visit Missouri several times a year.

Thanks for the tips.  The last thing I need is a broken flexure.

I am thinking about using Larry's A/D.  Did you find the filters that=20
useful?  Do you run a lot of gain between the BB13 and the A/D?

Frank









Frank,

I highly recommend Larry's A-D board and software. =
It has been a very reliable system for us for the past 15 months, and =
we are looking into the feasibility of converting many of the remote =
paper drum OGS sites to digital using the same system.

We are in an urban setting only one mile from a major =
interstate highway, so the filters in our location are very beneficial. =
Currently the gain for OCO2Z is 545 with a 1 Hz 8-pole lp filter, and =
100 second 1-pole hp filter. We are in the process of constructing a =
new thermally stable underground seismometer vault, and will most =
likely remove the hp filter after installation.

Greg Christenson 

NEIC station code OCO 

Omniplex Science Museum 

http://www.omniplex.org/OCOdata 






-----Original Message-----

From: Frank Gentges K=D8BRA [mailto:fgentges@..............] 

Sent: Tuesday, May 27, 2003 4:28 PM

To: psn-l@..............

Subject: RE: Teledyne Geotech BB13 =
Seismometer




Greg,


Nice to hear from you.  I picked up your site on =
a Google search for the 

BB13.  I try to drop by each day to see the =
seismic activity at OCO.


I saw the recent Virginia event and I think I saw the =
big event in Algeria 

although the times don't seem quite right.


It looks like a nice museum display you have set up =
there.  I might try to 

drop by sometime.  I visit Missouri several =
times a year.


Thanks for the tips.  The last thing I need is a =
broken flexure.


I am thinking about using Larry's A/D.  Did you =
find the filters that 

useful?  Do you run a lot of gain between the =
BB13 and the A/D?


Frank