PSN-L Email List Message

Subject: Re: Just Sitting on my couch thinking.
From: chrisatupw@.......
Date: Mon, 5 Mar 2012 07:36:40 -0500 (EST)



From: Geoffrey gmvoeth@.........
Subject: Just Sitting on my couch thinking.


Hello PSN;
I was sitting on my couch thinking about why
here seems to be a signal dead spot at resonance in my geophone.

i Geoff,=20
    There SHOULDN'T be a dead spot at the resonance of a 1Hz=20
gepophone. What amplifier / filter circuits are you using ?=20
You aren't by any chance trying use 2nd order filters to try=20
to increase the period range, do you ? These can produce a=20
dead spot at the resonant frequency.=20
.
    Regards,=20
.
    Chris


= From: Geoffrey gmvoeth@......... Subject: Just Sitting on my couch thinking.

Hello =
PSN;

I was sitting on my couch thinking about why
there seems to be a signal dead spot at resonance in my geophone.


Hi Geoff, 
    There SHOULDN'T be a dead spot at the resonance of a 1=
Hz 
gepop=
hone. What amplifier / filter circuits are you using ? 
You aren't by any chance try= ing use 2nd order filters to try
to increase the per=
iod range, do you ? These can produce a 
dead spot at the resonant frequency. 
.<=
/PRE>
    Regards, <=
/TT>
.
    Chris


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