PSN-L Email List Message

Subject: Re: Electronic noise
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?= jonfr@.........
Date: Thu, 13 May 2010 22:57:42 +0000


Hi all,

I did replace the rca audio cable with a cat-5 cable that is shielded.
So now there a cat-5 cable all the way. With just one connection point
on the way. This should prevent all electronic noise from getting into
the cable.

For some reason the rca audio cable that I was using is not good enough
for this.

Regards,
J=F3n Fr=EDmann.

On fim, 2010-05-13 at 09:30 -0700, Geoffrey wrote:
> IS this really true or is it possible
> that a common mode signal is generated equally
> on both of the twisted wires instead of possibly
> a phase shifted differtential signal ??
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> Amplifiers are designed to reject common mode signals
> unless you desire a very big voltage input.
> Like +/- 100V
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> ???
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> In my opinion nothing beats the old russian doll idea
> where you nest two or three layers of 100% shields.
> But doing that right that is very expensive and not easy to do.
> You need to deal with ANY/ALL wires which
> may breach the shielding. And any wavelengths of RFI
> smaller than any holes can get in too.
>=20
>=20
> ----- Original Message -----=20
> From: "George Bush" 
> To: ; "PSN-Postlist" 
> Sent: Thursday, May 13, 2010 8:04 AM
> Subject: Re: Electronic noise
>=20
>=20
> J=F3n-
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> The Cat-5 cable is twisted and therefore cancels
> magnetically-induced noise (one twist acts like a
> small inductive loop, but then the next twist
> detects the fields backward and cancels the
> noise).
>=20
>=20
>=20
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