Return-Path: Received: (qmail 82635 invoked from network); 15 Sep 2004 21:19:00 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore01.plus.net with SMTP; 15 Sep 2004 21:19:00 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1C7hJQ-00032O-6a for dave@picks.force9.co.uk; Wed, 15 Sep 2004 22:27:36 +0100 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1C7hJQ-00032L-3o for dave@picks.force9.co.uk; Wed, 15 Sep 2004 22:27:36 +0100 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1C7hB6-0000Ba-0O for dave@picks.force9.co.uk; Wed, 15 Sep 2004 22:19:00 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1C7hAa-0005oS-Ge for rs_out_1@blacksheep.org; Wed, 15 Sep 2004 22:18:28 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1C7hAa-0005oJ-3u for rsgb_lf_group@blacksheep.org; Wed, 15 Sep 2004 22:18:28 +0100 Received: from cas-mta4-fe.casema.nl ([83.80.1.32] helo=mta.casema.nl) by relay.thorcom.net with esmtp (Exim 4.41) id 1C7hAW-0004d7-ME for rsgb_lf_group@blacksheep.org; Wed, 15 Sep 2004 22:18:28 +0100 Received: from pcprive (535582D3.cable.casema.nl [83.85.130.211]) by cas-mta4.mgmt.casema.nl (iPlanet Messaging Server 5.2 HotFix 1.21 (built Sep 8 2003)) with SMTP id <0I430006BPUJ5I@cas-mta4.mgmt.casema.nl> for rsgb_lf_group@blacksheep.org; Wed, 15 Sep 2004 23:18:19 +0200 (CEST) Date: Wed, 15 Sep 2004 23:18:04 +0200 From: haagrimbergen To: rsgb_lf_group@blacksheep.org Message-id: <005301c49b69$7d829e00$d3825553@pcprive> MIME-version: 1.0 X-MIMEOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-Priority: 3 X-MSMail-priority: Normal X-SPF-Result: relay.thorcom.net: 83.80.1.32 is neither permitted nor denied by domain of casema.nl X-Spam-Score: 0.8 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.809,HTML_MESSAGE=0.001 Subject: LF:LF Components Content-type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

Dear Alan, LF group

Art. 38-2670 Ferrite rod is interesting. The six slots act as a gutter for the connecting wires. Material is 3A10, permeability about 350 only usable for receiving purposes.

I used it once for a permeability tuned inductance in an ATU, but the rod became very hot so satuation field seems to be rather low.

It behaves excellent for LF receiving.

Toroids can vary in AL values from 2 to 10,000 or even more.

The lowest are iron dust cores and can be used for ATU's and receiver tuning circuits.

As ferrite type toroids have no air gap permeability is rather temperature dependent, so dont use them in passive filters.

The high AL value items are intended for RFI suppression.

For HF baluns only the low AL types are useable.

General rules for colour coding cannot be given as each manufacturer has its own system of coding .

AL can be measured for instance by winding ten turns and then measure the inductance. AL = nanoH per turn squared.

Best greetings from Harry, PA0LQ.