[Lf] [Fwd: Re: LF: New cores from Micrometals]

[Andre Kesteloot]

-------- Original Message --------
Subject: Re: LF: New cores from Micrometals
Date: Fri, 29 Nov 2002 16:00:42 +0000
From: James Moritz <j.r.moritz at herts.ac.uk>
Reply-To: rsgb_lf_group at blacksheep.org
To: rsgb_lf_group at blacksheep.org
References: <8.3082bd21.2b189b74 at aol.com>

Dear Andre, LF Group,

At 09:47 29/11/2002 -0500, you wrote:
 >does anyone know of a table of equivalency between the Philips cores and
 >the Micrometal ones?

The Micrometals cores are iron dust, whilst the Philips cores usually seen
in LF use are ferrites, eg. 3C85 etc. Philips (or presumably Ferroxcube
now) do produce iron dust materials , designated 1Pxx and 2Pxx according to
the 1991 Philips data book I have here. "xx" is the relative permeability
of the material; the 1P04, 1P11, 1P30 series seems to be intended for tuned
applications, and are probably quite similar to Micrometals materials with
similar permeability, while the higher permeability, higher loss 2P
materials are intended for noise supression. However, cores in the 1P
materials don't seem to be a standard catalogue item.

Cheers, Jim Moritz
73 de M0BMU