Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id D997D38000099; Tue, 16 Aug 2011 08:00:25 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QtIJ7-0001Zs-P3 for rs_out_1@blacksheep.org; Tue, 16 Aug 2011 12:59:45 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QtIJ7-0001Zj-CO for rsgb_lf_group@blacksheep.org; Tue, 16 Aug 2011 12:59:45 +0100 Received: from out1.ip04ir2.opaltelecom.net ([62.24.128.240]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QtIJ5-0002Md-Qa for rsgb_lf_group@blacksheep.org; Tue, 16 Aug 2011 12:59:45 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AgUFACZbSk5Ok80o/2dsb2JhbABBlF4Dk094gTsUAQEDSQIPHQIIAgEHARw5AQQaBiQdAQICAQGHYZkqoFOGRwSHMJxY X-IronPort-AV: E=Sophos;i="4.67,380,1309734000"; d="scan'208,217";a="342826387" Received: from host-78-147-205-40.as13285.net (HELO xphd97xgq27nyf) ([78.147.205.40]) by out1.ip04ir2.opaltelecom.net with SMTP; 16 Aug 2011 12:59:37 +0100 Message-ID: <000a01cc5c0b$ef813600$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: "rsgb" Date: Tue, 16 Aug 2011 12:59:21 +0100 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 failure Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01CC5C14.50EB21F0" 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: 0:2:352723616:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d61894e4a5bd9647a 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_01CC5C14.50EB21F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable LF I just carried out a non scientific experiment with a ferrite antenna = and it proved to be a failure Experiment Wound a bundle of ferrite rods (9) with 1 mm enamel wire and got 900 uH = approx inductance. I connected this via coax to my Datong up converter = IF 144 Mhz to my normal RX. ( the datong resonated the ferrite antenna ) = there was pick up and signals audible but they were down 9 S points = compared with my 40 metre vertical loop antenna. I tried the this ferrite antenna both vertical es horizontal in the = horizontal plane it did show directional properties. It was working but = the signal capture was vy poor.=20 A pre amp would probably have improved the sensitivity and maybe that is = the answer but by itself it is no good. de mal/g3kev ------=_NextPart_000_0007_01CC5C14.50EB21F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I just carried out a non scientific = experiment with=20 a ferrite antenna and it proved to be a failure

Experiment

Wound a bundle of ferrite rods (9) with 1 mm = enamel wire=20 and got 900 uH approx inductance. I connected this via coax to my Datong = up=20 converter IF 144 Mhz to my normal RX. ( the datong resonated the ferrite = antenna=20 ) there was pick up and signals audible but they were down 9 S points = compared=20 with my 40 metre vertical loop antenna.

I tried the this ferrite antenna both vertical = es=20 horizontal in the horizontal plane it did show directional properties. = It was=20 working but the signal capture was vy poor.

A pre amp would probably have improved the = sensitivity and=20 maybe that is the answer but by itself it is no good.

de mal/g3kev

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