Received: from mtain-mk05.r1000.mx.aol.com (mtain-mk05.r1000.mx.aol.com [172.29.97.137]) by imd-db08.r1000.mx.aol.com (Inbound Mail Deferral) with ESMTP id A61357034B236 for <markusvester@aol.com>; Sat, 1 Oct 2011 03:01:00 -0400 (EDT) Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id EE1B0380000A5; Sat, 1 Oct 2011 03:00:58 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R9tXn-0008Bs-62 for rs_out_1@blacksheep.org; Sat, 01 Oct 2011 07:59:31 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R9tXm-0008Bj-B3 for rsgb_lf_group@blacksheep.org; Sat, 01 Oct 2011 07:59:30 +0100 Received: from smtp05.online.nl ([194.134.41.35]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <victor13@online.nl>) id 1R9tXk-0003iT-Mc for rsgb_lf_group@blacksheep.org; Sat, 01 Oct 2011 07:59:30 +0100 Received: from smtp05.online.nl (localhost [127.0.0.1]) by smtp05.online.nl (Postfix) with ESMTP id 4B2FA52242 for <rsgb_lf_group@blacksheep.org>; Sat, 1 Oct 2011 08:59:22 +0200 (CEST) Received: from pa3fnytrqxpddu (s529d275f.adsl.wanadoo.nl [82.157.39.95]) by smtp05.online.nl (Postfix) with SMTP for <rsgb_lf_group@blacksheep.org>; Sat, 1 Oct 2011 08:59:22 +0200 (CEST) From: <victor13@online.nl> To: <rsgb_lf_group@blacksheep.org> Date: Sat, 1 Oct 2011 08:59:22 +0200 Message-ID: <BDEMKFCNLMIILGIFNONNCEEEDPAA.victor13@online.nl> MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) In-Reply-To: <4E863BD6.7060004@iup.uni-heidelberg.de> X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5994 Importance: Normal X-Online-Scanned: by Cloudmark authority (on smtp05.online.nl) X-Spam-Score: 0.6 (/) X-Spam-Report: autolearn=disabled,NO_REAL_NAME=0.55 Subject: RE: LF: Ferrite RX antennas Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.0 required=5.0 tests=BANG_MONEY,FROM_ENDS_IN_NUMS, 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-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:436343648:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61894e86baaa309f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Stefan, at the institute I am working we are using lithographic superconducting = coils with special NPO capacitors In the range from 100KHz to 5MHz Q up = to 5000 is optained.... 73 Victor -----Oorspronkelijk bericht----- Van: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]Namens Stefan Sch=C3=A4fer Verzonden: zaterdag 1 oktober 2011 0:00 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: Ferrite RX antennas Hello Jim, Maybe liquid helium and a superconductor material? ;-) 73, Stefan Am 30.09.2011 15:14, schrieb James Moritz: > Dear Mal, LF Group, > > G3KEV wrote: >> Some commercial produced coils encased in helium tubes had vy high Q=20 >> that would rival the ferrite variety used today. > > Helium tubes? Sounds like a good way of separating unwary amateurs=20 > from their money! > > Cheers, JimMoritz > 73 de M0BMU