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Re: [TowerTalk] Ferrite material Laird 28

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Ferrite material Laird 28
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 27 Mar 2017 12:07:25 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On Mon,3/27/2017 4:46 AM, Richard (Rick) Karlquist wrote:
I have measured various competitor's
"equivalents" to material 43 and the found
that they are considerably lossier.

For common mode chokes, lossier is better. But so is the shape of the curve of loss vs. frequency, and so is resonant frequency. You either need to wind chokes and measure them or have graphs of mu' and mu'' vs frequency to compare with the Fair-Rite materials. Laird's website appears to be totally inscrutable with any of this, FAR, FAR, FAR behind Fair-Rite's. Laird's seems to have been done by a data guy, Fair-Rite's by an applications engineer who actually understands what's needed to choose a part and design using it.

73, Jim K9YC

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