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Re: [RFI] Info needed

To: rfi@contesting.com
Subject: Re: [RFI] Info needed
From: "Dave (NK7Z)" <dave@nk7z.net>
Date: Wed, 17 Jul 2024 12:16:08 -0700
List-post: <mailto:rfi@contesting.com>
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

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