Re: Computer RFI problems-FARMERIK

Mike Mayer <mwmayer@...>



I agree that the presentation you linked to is one of the best out there.


If you remember one thing it is that the suppression is proportional to the square of the number of turns. The typical clamp-on ferrite is one turn (the wire goes through once). If you look at some of the suggestions you will see multiple turns. Two turns is four times as good, three turns is 9 time as good, etc.


And yes, everything has either a noisy processor or a noisy switching power supply. That is why another option is to use an external antenna away from all of the noise sources in the house.


Mike Mayer

From: ultralightdx@... [mailto:ultralightdx@...] On Behalf Of Peter Laws
Sent: Wednesday, January 12, 2011 10:22 AM
To: ultralightdx@...
Subject: Re: [ultralightdx] Computer RFI problems-FARMERIK



On Wed, Jan 12, 2011 at 08:35, farmerik <farmerik@...> wrote:

> Anyone out there RFI proofed there house already, and have any pointers?

This is hardly a FAQ, but it is a good tutorial on RFI. It's
ham-oriented, but RF is RF and a lot of it is receive oriented (as
opposed to RFI from your own transmitter, though that is covered,
too). I'm about a 1/3 of the way through it. :-)

Peter Laws | N5UWY | plaws plaws net | Travel by Train!

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