Topband: Ferrite Cores

[Carl]

31 and 43 mix are the popular ones in the 2-30 MHz range for common mode 
suppression; 31 wins at 160 and 80, but 43 is better in the 7-30 range.

Before 31 came along I used 43 even at 160 and observed problems went away 
since they werent as bad as others experienced.

Carl
KM1H


----- Original Message ----- 
From: "Ron Stordahl, AE5E via Topband" <topband at contesting.com>
To: <jim at audiosystemsgroup.com>; <topband at contesting.com>
Sent: Wednesday, August 06, 2014 11:15 AM
Subject: Re: Topband: Ferrite Cores


In this discussion two different ferrite mixes are mentioned: #31 and #61.


>From the descriptions of these on the Fair-Rite web page, it appears that 31 
would be more suitable for lower frequency applications.


Is this the case?

Ron, AE5E



On Wednesday, August 6, 2014 4:02 AM, Charlie <charlie-cunningham at nc.rr.com> 
wrote:



I agree with all those points, Jim! Over the years, professionally, we
designed many Fair-Rite, cores into most of our electricity, gas and water
meter and electricity load-management products and shipped millions of
Fair-Rite products in our devices. Fair-Rite and Kreger are excellent
suppliers, and I still have many of their development kits around here.
Their products are excellent and very consistent

Lynne Frye, of Kreger, is a very helpful contact person, that I have worked
with over the years!

Have a good day!

73,
Charlie Cunningham, K4OTV



-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, August 05, 2014 3:00 PM
To: topband at contesting.com
Subject: Re: Topband: Ferrite Cores

On 8/5/2014 11:36 AM, Mike Waters wrote:
> FT-240-61 cores. Amidon was $9/ea, Mouser (for the Fair Rite
> equivalent)
> >was $14/ea.

The actual manufacturer of a 2.4-in o.d. #61 toroid IS Fair-Rite. It is not
an "equivalent," #61 material is Fair-Rite's mix. Other companies may make a
"knock-off," but the REAL part is made by Fair-Rite.

73, Jim K9YC


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