PSN-L Email List Message

Subject: Re: spike problem
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr500@.........
Date: Mon, 05 Jun 2006 00:06:57 +0000


I live in a block with seven other apartment in them, at least two of
those apartments are close enugh so wireless signal can reach my
apartment. There is one GSM transmitter near me, in about 400 meters
away from my location in direct line. It uses 900Mhz band.

>  Is your cold water supply in metal of plastic pipes? Look under the
> handbasin in the bathroom?

The cold water uses metal pipes. This goes for the whole apartment, same
as the hot water pipes.

The spikes have frequancy down to 0.1Hz, they appear at every frequancy
band. But sometimes they drop in strength as I got lower in the

> I did suggest that you use six core cable with a plaited copper
> screen. This cable has six plastic insulated colour coded wires, a
> plaited bare copper screen and a PVC sheath. Could you not buy any? It
> is likely to be much better that cat5 cable.

I don't think this was avalable from where i did buy the Cat-5 cable. I
told the guy what I needed, he did suggest cat-5 cable. But if I get a
picture of what you mean, I can check if I can buy that type of cable.

Far as I can tell, this problem is not in the amplifer board and not in
the geophone it self. I don't have a second testing unit (geophone), so
that is just a guess.

Is it possible that some electronic device in my apartment might be
failing and creating this type of noise ? I have three computers and I'm
going to replace at least one PSU next week becose I know it is getting
old an overused.

There also must be some way for me to filter the signal out.

Jón Frímann


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