Jón Frímann wrote:
> Hi all,
> 
> I did replace my cable the other day from Cat-5 shielded cable to a RCA
> cable that is also shielded. But with the Cat-5 cable I did not get
> electronic noise. But with the RCA cable I do. I rather do not want to
> switch back to the Cat-5 cable, as it is harder to manage.
> 
> What might be the reason why I am seeing electronic noise on the RCA
> cable ?

Hi Jón,

The type of cable is probably less significant than the way it's connected.

For a pretty much bulletproof connection you probably want to use a twisted 
pair, shielded, cable. Microphone cable is probably a good thing to ask for.

Then you want to connect the shield to the cases of the geophone and the 
electronics, and the twisted pair to the terminals of the geophone and the 
input of the electronics.

This configuration causes most interference to be deflected by the shield and 
most remaining 'common mode' interference to cancel itself out.

All the best
Mark


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