PSN-L Email List Message
Subject: Question about sensitivity.
From: "John D Nelson" jnelson@.................
Date: Mon, 21 Jul 2003 10:02:12 -0500
I have a geophone with a 10 hz resonant frequency and a home made
vertical with a period of about one second. Does the lower resonant
frequency make the vertical less sensitive to local noise? My
observations seem to back this up. There is a NAFTA rail line about 2
miles East of my house that makes a lot of low frequency noise and the
geophone seems to pick it up more than the vertical. I'm using the same
amplifier for each, John Lahr's circuit with an additional 2 pole filter
added on at the end which I thought would pretty much cut out local
noise but this doesn't seem to be the case.
Message
I have =
a geophone=20
with a 10 hz resonant frequency and a home made vertical with a period =
of about=20
one second. Does the lower resonant frequency make the vertical =
less=20
sensitive to local noise? My observations seem to back this =
up. =20
There is a NAFTA rail line about 2 miles East of my house that makes a =
lot of=20
low frequency noise and the geophone seems to pick it up more than the=20
vertical. I'm using the same amplifier for each, John Lahr's =
circuit with=20
an additional 2 pole filter added on at the end which I thought would =
pretty=20
much cut out local noise but this doesn't seem to be the=20
case.
[ Top ]
[ Back ]
[ Home Page ]