Re: pa0nhc : Ferrite for denoising.

Nico H.C.J. Veth


For ferrite cores which will be used to suppress noises on cables, ONLY use ferrite #31.


Fiar Rite 04 31 17 64 51 is a split core “Snap It”. with a 19mm hole. Easy to wind cable through it.

  • Order for more than 50 Euros at, and you get rabat, AND free shipping. ç

Ferroxcube  3S4 material is equivalent.  Ring core 36/23/15-3S4 Is available at .

On my site  is a lot of info, and an article in English about my active receiving loop antenna :
Read : “Construction details and testing”. At the bottom of this PDF you find the instruction for denoising.
Also read : :”Denoising the external power supply”

                     “Blocking mains related noises”.


The article “Common Mode Chokes” is at the moment only in Dutch language, as it is a translated subset of a very detailed article by K9YC. I will translate it in Engles, so you can read the most useful info it here later.


DO NOT use other ferrites. Read why.


73’s, Nico pa0nhc.


Verzonden vanuit Mail voor Windows 10


Van: Ron
Verzonden: vrijdag 13 maart 2020 08:54
Onderwerp: Re: [SDR-Radio] Can You Recognize This QRM Nightmare That Just Began?



Mouser UK 623-0431177081

Ron, G6BMY

On 13/03/2020 07:27, f5mwa wrote:

Hello Allen,

Many thanks for the info on the noise suppressor (via M0NWK)

No way to find the P/N you or also M0NWK have given i.e. Fair-Rite #043177081.
Mouser or even Fair-Rite do not have such reference #.
Can you please specify your source ?

Many thanks in advance

Ezio - K3EK - F5MWA





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