PSN-L Email List Message
Subject: Re: spike problem
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Mon, 05 Jun 2006 18:19:45 +0000
> Have you posted two or three recordings of the spikes?
I am doing that just now. Thanks for the reminder.
Here is a recording of the spike that did happen last night.
This is the larger type of spikes.
Here is a recording of the smaller spikes that happen after I did
connect the cat-5 cable directly to the geophone.
Timothy Carpenter wrote:
> Do you have the geophones connected single-ended or double-ended (full
> differential). If your board has the capability, I'd recommend that
> connections be full differential.
I connect both wires.
John Popelish wrote:
> Could be, but I am suspecting a heater switching on and off, every
> seconds. Printer fuser roll heater comes to mind.
I only own a ink printer.
Randy Kimball wrote:
> Do you have a cell phone.... now hang on...
> Cell phones check in with the tower systems every so often. This is
> they know if your phone is on line and to which tower to transmit to
> cell phone. I'm no cell phone expert so my version of this is perhaps
> just a little but I think this is the layman's version of what
> happens. If
> your cell is on and in the area of .... well you get the rest... this
> is the
> daut daut daut..daut sound we hear in our car radios at times when the
> phone is near the radio receiver. In my coach I hear it in my CB,
> Could this be the mystery everyone is seeking?
I own a GSM phone (cell phone), I know that it can pickup noise from it
if I am close to the line or to the ampilfer board. But that is not all
the time, I can also see a diffrance from that type of noise and what I
am dealing with now. My gsm phone is usally on the board on my main
desktop computer, that is a good meter away from the amplifer board and
the wire that is connected to the geophone.
I know now that there is a noise in the MW radio band (Chris did ask me
to check on that). That noise comes from the computers that I own. I
can't change my setup becose I live in a limited space.
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