[RFI] Info needed

[Dave (NK7Z)]

Hi,

Take a look at:

https://www.nk7z.net/rfi-now-house-cleaning/

that is a little piece I put together dealing with cleaning up RFI on 
various items...  About halfway down is a list of ferrites by type, with 
Fair-Rite part numbers.  Cut those numbers and paste them into the 
catalogs of the various parts houses...

Here is the Mouser link:

https://www.mouser.com/ProductDetail/Fair-Rite/2631803802?qs=P8bU7i9nNAWMk1EJQzshLg%3D%3D

and here is the Fair-Rite link:

https://fair-rite.com/product/round-cable-emi-suppression-cores-2631803802/

If you are trying to suppress 14 MHz and lower I would use mix31, if 
above 14, mix43.

Place about 7 to 10 wraps of cable on a ferrite.  Each pass through 
center counts as a turn...

Normally in the Fair-Rite part number the second pair of number is the 
mix number...

Hope this helps...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/17/24 09:45, Ken Gordon wrote:
> I am in the process of building and/or serviceing a few devices here which I believe could use
> ferrite beads on some of the leads.
> 
> One of those "devices" is a TV-2/U tube tester, an early model which does not have the
> beads on certain leads and thus oscillates when testing certain tubes.
> 
> I am also working on a couple of HF wattmeters.
> 
> I would like advice from knowledgeable members of this group was to what "mix" of ferrite
> would be most suitable.
> 
>  From my cursory investitagation, it would appear that mix 31 would be the mix I would need,
> at least for the HF wattmeter project, but also that would appear to be useful for my tube
> tester issues.
> 
> Yet checking Mouser and eBay for those beads, all I find are mix 43 and mix 73, and, so far,
> no mix 31.
> 
> I have downloaded the necessary documenation from Palomar's site listning the various
> characteristices for the various mixes, and it still seems to me that mix 31 would be my best
> choice.
> 
> Anyone?
> 
> Ken W7EKB
> 
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi