Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3B38538000094; Sat, 1 Oct 2011 08:43:29 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R9ytT-0000Sh-0u for rs_out_1@blacksheep.org; Sat, 01 Oct 2011 13:42:15 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R9ytS-0000SY-6h for rsgb_lf_group@blacksheep.org; Sat, 01 Oct 2011 13:42:14 +0100 Received: from smtp6.freeserve.com ([193.252.22.191]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R9ytQ-0005My-4f for rsgb_lf_group@blacksheep.org; Sat, 01 Oct 2011 13:42:14 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3617.me.freeserve.com (SMTP Server) with ESMTP id 332E87000095 for ; Sat, 1 Oct 2011 14:42:06 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf3617.me.freeserve.com (SMTP Server) with ESMTP id 220547000099 for ; Sat, 1 Oct 2011 14:42:06 +0200 (CEST) Received: from AGB (unknown [2.26.28.211]) by mwinf3617.me.freeserve.com (SMTP Server) with SMTP id BEF837000095 for ; Sat, 1 Oct 2011 14:42:03 +0200 (CEST) X-ME-UUID: 20111001124203782.BEF837000095@mwinf3617.me.freeserve.com Message-ID: <43F923FD013A4DA183F36A7DD7A3075A@AGB> From: "Graham" To: References: In-Reply-To: Date: Sat, 1 Oct 2011 13:28:06 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Antivirus: avast! (VPS 111001-0, 01/10/2011), Outbound message X-Antivirus-Status: Clean X-Spam-Score: 0.5 (/) X-Spam-Report: autolearn=disabled,MAILTO_TO_SPAM_ADDR=0.276,RCVD_ILLEGAL_IP=0.234 Subject: Re: LF: Ferrite RX antennas Content-Type: text/plain; format=flowed; charset="utf-8"; reply-type=original 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,MAILTO_TO_SPAM_ADDR, MISSING_OUTLOOK_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: 0:2:497682624:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d410c4e870af140e4 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Didn't Birmingham use something similar to produce some very deep=20 notch filters when the Beagle disappeared ? G.. -------------------------------------------------- From: Sent: Saturday, October 01, 2011 7:59 AM To: Subject: RE: LF: Ferrite RX antennas > > Hi Stefan, > > at the institute I am working we are using lithographic superconducting= =20 > coils with special NPO capacitors In the range from 100KHz to 5MHz Q up= to=20 > 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 >>> that would rival the ferrite variety used today. >> >> Helium tubes? Sounds like a good way of separating unwary amateurs >> from their money! >> >> Cheers, JimMoritz >> 73 de M0BMU > > >=20