Computer RFI – ferrite clip-ons

Noise and interference issues?
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pnoelw
Posts: 13
Joined: 24 Apr 2016 16:54
Location: Clacton-on-Sea

Computer RFI – ferrite clip-ons

Post by pnoelw » 29 Aug 2018 17:33

I’m about to tackle a clean-up operation on the computer leads – USB, video, etc.

I can see that I have interference from the computer right from hf through to a few hundred MHz. I see that the ferrite materials in the clip-ons are designed to peak at specific frequency ranges.

The computer has an i7-8700 processor which works at up to 4.6GHz. The video processor runs at around 1.7GHz. I’m sure there’s plenty else inside the case which will also add lots of hash.

Where should I be focusing? In the 10MHz region or 100MHz or maybe even 300MHz or higher?

Noel.

satnipper
Posts: 1062
Joined: 03 Oct 2014 12:58
Location: Western Europe

Re: Computer RFI – ferrite clip-ons

Post by satnipper » 29 Aug 2018 20:47

Read this page http://www.ifwtech.co.uk/g3sek/in-prac/ and buy Fair-Rite part number 2643167851 for data leads and Fair-Rite 31 clamp-on core, Part No 0431177081 for mains cables.

Stuart

pnoelw
Posts: 13
Joined: 24 Apr 2016 16:54
Location: Clacton-on-Sea

Re: Computer RFI – ferrite clip-ons

Post by pnoelw » 30 Aug 2018 11:27

Thanks for the leads, Stuart. I'll give these a try.
Noel.

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