[600MRG] Ferrite cores

[William E. Isakson]

Doug DeMaw "Ferromagnetic-Core Design & Application Handbook"  --  lots of
copies of that around.  expect $60 to $100 for one used though.

--------


Bill Isakson     AC6QV
Roseburg, Oregon USA
bill.isakson at gmail.com

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On Mon, Feb 24, 2014 at 11:41 AM, Rudy Severns <n6lf at epud.net> wrote:

> Following up on my earlier comments on ferrite cores for 600m.  I went to
> the www.mouser.com web page and checked out the availability of cores.  I
> also went back through the Fair-Rite catalog reading the material
> descriptions to jog this old memory.
>
> A few comments:
>
> 1) The type 31 material is MnZn but it's primarily for EMI suppression.
> The range of core sizes is limited and I wouldn't recommend it for
> transformers and
> inductors anyway.
>
> 2) I looked over the Fair-Rite MnZn materials and it appears to me that the
> 77 material is really the most appropriate for 600m.  Fortunately Mouser
> (and
> I'm sure other suppliers) has a great selection of toroids in stock.  One
> is 4" in
> diameter by an 1" thick!  Of course those are $40 a pop.  The smaller ones
> are much cheaper.
>
> 3) Fair-Rite also has EE, EI, EER, etc cores in 78 material as well as
> some new material, 95 and 98, which I haven't had a chance to evaluate.
>
> 4) For an inductor with a ferrite core you will need to use an air gap.
>  The EE, EI, UU, etc cores make this easy and Fair-Rite has applications
> information on AL and gap lengths.
>
> 5) The ARRL used to sell a very nice book by Doug DeMaw
> "Ferromagnetic-Core Design & Application Handbook".  I don't think it's for
> sale anymore but if you can get your hands a copy grab it!  If I put
> together a monograph for 600m magnetics I would shamelessly plagiarize
> DeMaw!
>
> 6) Besides Fair-Rite, TDK also has a large line of ferrite cores although
> I haven't looked at the material characteristics for years so no
> recommendations.  Mouser sells some TDK cores.
>
> What this discussion has done is to prompt me dredge up things I haven't
> thought about for years which is kind of fun.  I'll have to give some
> thought to some guidelines at least.
>
> GL and 73, Rudy
>
>
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