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From: k2ors@comcast.net (Warren K2ORS/WD2XGJ)
To: rsgb_lf_group@blacksheep.org, <rsgb_lf_group@blacksheep.org>
Cc: "james moritz" <j.r.moritz@herts.ac.uk>
Date: Thu, 16 Mar 2006 14:46:11 +0000
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Subject: Re: LF: RE: source for large 3C90 toroids wanted........
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Jim, Dick and the group,
I looked at the Fair-Rite Mix 78, seems to have about 1/3 the loss at 100kHz compared to Mix 77, would large Mix 78 cores make a good high power transformer at 137?
--
73 Warren K2ORS/WD2XGJ
FN42hi
http://www.w4dex.com/wd2xgj.htm
-------------- Original message ----------------------
From: "james moritz" <j.r.moritz@herts.ac.uk>
> Dear Dick, LF Group,
>
> The Siemens N87 grade is a near-equivalent to 3C90. N27 and N67 are similar
> also. N30 is a higher permeability material, not really intended for power
> applications. Fair-Rite 78 grade is also very similar.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
> -----Original Message-----
> From: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Dick
> Sent: 16 March 2006 11:20
> To: rsgb_lf_group@blacksheep.org
> Subject: LF: source for large 3C90 toroids wanted........
>
> Hello .......
>
> I am looking for a source to buy 3C90 (or 3C85) toroids, 58mm diameter.
> Up til now I can only find 'Spoerle' , but I have to buy at least 36 of
> them............
>
> Is there any other compagny that have these large cores available in lower
> quantities??
> Preferable in Germany or the Netherlands.
>
> Maybe there is a alternative by using Epcos cores? Material N87?? or N30??
> Anyone??
>
> 73
>
> Dick , PA4VHF
>
> (I know about using TV-cores etc, but just wonder if there is a way to get
> these nice ringcores)
>
>
>
>
>
>