Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-da01.r1000.mx.aol.com (Internet Inbound) with ESMTP id DDE1238000524; Fri, 30 Sep 2011 12:15:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R9fiG-0006sS-RI for rs_out_1@blacksheep.org; Fri, 30 Sep 2011 17:13:24 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R9fiG-0006sJ-Ap for rsgb_lf_group@blacksheep.org; Fri, 30 Sep 2011 17:13:24 +0100 Received: from out1.ip05ir2.opaltelecom.net ([62.24.128.241]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R9fiE-0007x1-OS for rsgb_lf_group@blacksheep.org; Fri, 30 Sep 2011 17:13:24 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhgFAPHphU5cHnQd/2dsb2JhbABBlH4DkzCBBoFOFAEBA0kCFAoOAggCAQcBHDkBBBoGGAwdAQICAQGHbJdXn0OHIASHRp1T X-IronPort-AV: E=Sophos;i="4.68,468,1312153200"; d="scan'208,217";a="356320896" Received: from host-92-30-116-29.as13285.net (HELO xphd97xgq27nyf) ([92.30.116.29]) by out1.ip05ir2.opaltelecom.net with SMTP; 30 Sep 2011 17:13:16 +0100 Message-ID: <000a01cc7f8b$db7dfaf0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Fri, 30 Sep 2011 16:13:14 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: ferrite antenna Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01CC7F8B.DB2CF4C0" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:367051328:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d40494e85eb1b1911 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. ------=_NextPart_000_0007_01CC7F8B.DB2CF4C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LF I made an effort today to resonate my ferrite antenna 906 uH /1500 nF approx for 137 Khz, no preamp so far, no suitable Fets = available. I am getting reasonable reception with the antenna indoors = and with a 20 dB gain amp I am sure it would be excellent. The package contains 9 ferrite rods displaced around a bakelite rod, = total diamater 45mm and length 100mm. The rod bundle is ex commercial = atu and material unknown. Wire is 1mm enamel cu. Rx is Siemens level = meter D2155.=20 I have no link winding, connection to RX is direct to the main coil = winding. If and when I get time I will wind an air core of similar inductance and = compare the sensitivity against the ferrite core coil. 73 de mal/g3kev ------=_NextPart_000_0007_01CC7F8B.DB2CF4C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I made an effort today to resonate my ferrite=20 antenna

906 uH /1500 nF approx for 137 Khz, no preamp so = far, no=20 suitable Fets available. I am getting reasonable reception with the = antenna=20 indoors and with a 20 dB gain amp I am sure it would be = excellent.

The package contains 9 ferrite = rods displaced around=20 a bakelite rod, total diamater 45mm and length 100mm. The rod bundle is = ex=20 commercial atu and material unknown. Wire is 1mm enamel cu. Rx is = Siemens level=20 meter D2155.

I have no link winding, connection to RX is = direct to the=20 main coil winding.

If and when I get time I will wind an air core = of similar=20 inductance and compare the sensitivity against the ferrite core=20 coil.

73 de mal/g3kev

------=_NextPart_000_0007_01CC7F8B.DB2CF4C0--