Return-Path: Received: from rly-de08.mx.aol.com (rly-de08.mail.aol.com [172.19.170.144]) by air-de02.mail.aol.com (v121_r3.13) with ESMTP id MAILINDE022-4f648ff83651cf; Wed, 22 Oct 2008 15:48:02 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de08.mx.aol.com (v121_r3.13) with ESMTP id MAILRELAYINDE085-4f648ff83651cf; Wed, 22 Oct 2008 15:47:52 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ksjg2-0005Nn-9H for rs_out_1@blacksheep.org; Wed, 22 Oct 2008 20:47:30 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Ksjg1-0005Ne-Tq for rsgb_lf_group@blacksheep.org; Wed, 22 Oct 2008 20:47:29 +0100 Received: from imo-d21.mx.aol.com ([205.188.144.207]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Ksjfz-0008D4-5O for rsgb_lf_group@blacksheep.org; Wed, 22 Oct 2008 20:47:29 +0100 Received: from G0MRF@aol.com by imo-d21.mx.aol.com (mail_out_v39.1.) id l.d4c.32f3b6bd (14467) for ; Wed, 22 Oct 2008 15:47:17 -0400 (EDT) From: G0MRF@aol.com Message-ID: Date: Wed, 22 Oct 2008 15:47:17 EDT To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 SE for Windows sub 5014 X-Spam-Flag:NO X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,NO_REAL_NAME=0.55 Subject: Re: LF: Ferrites - why low frequency limit? Content-Type: multipart/alternative; boundary="-----------------------------1224704837" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_40_50,HTML_MESSAGE, NO_REAL_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 X-AOL-SCOLL-AUTHENTICATION: domain : post.thorcom.com ; SPF_helo = n X-AOL-SCOLL-AUTHENTICATION: domain : aol.com ; SPF_822_from = + -------------------------------1224704837 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 22/10/2008 11:01:36 GMT Standard Time, john.rabson@wanadoo.fr writes: I have an envelope which used to have toroids in. The label says '0.1-2MHz'. Why the LF limit please? 73, John Rabson Radio F5VLF 58800 Cervon France JN17vg I infer that the limit is that they are ferrite and not laminated steel. David -------------------------------1224704837 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 22/10/2008 11:01:36 GMT Standard Time,=20 john.rabson@wanadoo.fr writes:

I have=20 an envelope which used to have toroids in. The label says=20 '0.1-2MHz'. Why the LF limit please?

73,
John Rabson
R= adio=20 F5VLF
58800 Cervon
France
JN17vg

I infer that the limit is that they are ferrite and not laminated=20 steel.

David

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