Hi Richard,

  If you want to stay with Dataq data acquisition, you might want to look at
the seismic software I have developed, which is available for free download
from my web site

http://sites.google.com/site/bobmcclure90/sitemap.

  I have a recorder, a heliplotter, and a scrolling heliplotter for web
display, plus utility software for filtering and conversion of event files
to WinQuake format.

  Filtering operations include an inverse filter, which converts raw data
from a short period sensor into a much broader band response without need
for the AS-1 black box or the Roberts circuit. Amaseis also implements my
inverse filter, but only on the SAC format event files it makes.

  I would recommend that you go for 12-bit conversion, which is available
from the Dataq DI-158U.

Bob McClure

Message----- From: Richard Schneider
Sent: Sunday, November 21, 2010 8:32 PM
To: PSNLIST@..............
Subject: My AS-1 Type Sensor

Hello, I'm new here and have a few questions.

I recently constructed an AS-1 type sensor. My station KCMA is on the IRIS
network.

http://www.iris.edu/amaseis/schools/as1imgs/KCMA.png

I am using an amplifier/filter, designed by Andy Loomis, which works quite
well. The natural period of the sensor is 1.7 seconds. The cutoff period of
the filter is set at 1.4 seconds.

My questions are.... Does anyone have a amplifier/filter design that will
extend it to 10 to 15 seconds? I know the manufacturer of the AS-1 can
provide the amp/filter, but it's a bit too pricey for my budget. And, I
believe somewhere, on the psnlist, I recall someone who had made
improvement's to the AS-1 amp/filter. Any recommendation's?

Additionally, my ADC is a Dataq 194RS which is only a 10 bit unit. The
original AS-1 "black box" operates at 12 bits. Is 10 bits satisfactory or do
I need a higher range?

Lastly, if anyone has an AS-1 "black box" for sale, I would be interested.

Thank you,

Richard Schneider
Hi Richard,

=A0 If you want to stay with Dataq data acquisition, you=
 might want to look at the seismic software I have developed, which is avai=
lable for free download from my web site 

http://sites.google.com/site/bobmcclure=
90/sitemap.



=A0 I have a recorder, a heliplotter, and a scrolling heliplotter for w=
eb display, plus utility software for filtering and conversion of event fil=
es to WinQuake format.

=A0 Filtering operations include an inverse f=
ilter, which converts raw data from a short period sensor into a much broad=
er band response without need for the AS-1 black box or the Roberts circuit=
.. Amaseis also implements my inverse filter, but only on the SAC format eve=
nt files it makes.



=A0 I would recommend that you go for 12-bit conversion, which is avail=
able from the Dataq DI-158U.

Bob McClure

Message----- From: R=
ichard Schneider

Sent: Sunday, November 21, 2010 8:32 PM

To: PSNLIST@SEI=
SMICNET.COM

Subject: My AS-1 Type Sensor


Hello, I'm new here and have a few questions.



I recently constructed an AS-1 type sensor. My station KCMA is on the IRIS =
network.



http://www.iris.edu/amaseis/schools/as1imgs/KCMA.png



I am using an amplifier/filter, designed by Andy Loomis, which works=20
quite well. The natural period of the sensor is 1.7 seconds. The cutoff=20
period of the filter is set at 1.4 seconds.



My questions are.... Does anyone have a amplifier/filter design that=20
will extend it to 10 to 15 seconds? I know the manufacturer of the AS-1=20
can provide the amp/filter, but it's a bit too pricey for my budget.=20
And, I believe somewhere, on the psnlist, I recall someone who had made=20
improvement's to the AS-1 amp/filter. Any recommendation's?



Additionally, my ADC is a Dataq 194RS which is only a 10 bit unit. The=20
original AS-1 "black box" operates at 12 bits. Is 10 bits satisfa=
ctory=20
or do I need a higher range?



Lastly, if anyone has an AS-1 "black box" for sale, I would be in=
terested.



Thank you,



Richard Schneider