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