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@contesting.com>
To: <jim@audiosystemsgroup.com>; <topband@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@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@contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, August 05, 2014 3:00 PM
To: topband@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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