PSN-L Email List Message

Subject: My AS-1 Type Sensor
From: Richard Schneider cfi2fly@.........
Date: Sun, 21 Nov 2010 12:32:17 -0800


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
Hello, I'm new here and have a few=A0questions.
=A0
I=A0recently constructed an AS-1 type sensor. My station=A0KCMA is=A0o= n the IRIS network.
=A0
http:= //www.iris.edu/amaseis/schools/as1imgs/KCMA.png
=A0
I am using an amplifier/filter, designed by Andy Loomis, which works q= uite well. The natural period of the sensor=A0is 1.7 seconds.=A0The cutoff = period of the filter is set at 1.4 seconds.
=A0
My questions are.... Does anyone have a amplifier/filter design that w= ill extend=A0it to=A010 to 15 seconds?=A0I 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 imp= rovement's to the=A0AS-1 amp/filter.=A0Any recommendation's?
=A0
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 satisf= actory or do I need a higher range?
=A0
Lastly, if=A0anyone has an AS-1 "black box" for sale, I woul= d be interested.
=A0
Thank you,
=A0
Richard Schneider

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