Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 237C7380000B3; Tue, 16 Aug 2011 19:13:43 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QtSoK-0006cA-4e for rs_out_1@blacksheep.org; Wed, 17 Aug 2011 00:12:40 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QtSoJ-0006c1-Es for rsgb_lf_group@blacksheep.org; Wed, 17 Aug 2011 00:12:39 +0100 Received: from nm3-vm0.bt.bullet.mail.ird.yahoo.com ([212.82.108.88]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1QtSoI-0007vY-BI for rsgb_lf_group@blacksheep.org; Wed, 17 Aug 2011 00:12:39 +0100 Received: from [212.82.108.230] by nm3.bt.bullet.mail.ird.yahoo.com with NNFMP; 16 Aug 2011 23:12:32 -0000 Received: from [212.82.108.224] by tm3.bt.bullet.mail.ird.yahoo.com with NNFMP; 16 Aug 2011 23:12:32 -0000 Received: from [127.0.0.1] by omp1001.bt.mail.ird.yahoo.com with NNFMP; 16 Aug 2011 23:12:32 -0000 X-Yahoo-Newman-Id: 715964.82862.bm@omp1001.bt.mail.ird.yahoo.com Received: (qmail 49698 invoked from network); 16 Aug 2011 23:12:32 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=btopenworld.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=6KCqSPultsKtojiCctHKG3oPfAyOmhL3iBFXh/Y0SbyHmmZm3Jb5sIG4t6vUZQWNZQFiyBjZjf1A3Ce1xRGt2YWbX9zukWmV0KLQFpTosTqQPMRGHnnih6eQvt0oxaz1WRSe0vCsVLTw+23xK1n9fmR3aOT2JIzRQ7Pwqe8fETA= ; DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=btopenworld.com; s=s1024; t=1313536352; bh=ds00tJ9hAp/EDEdrRXMzxVcD/dDwl5TR0JAPUs2lW8w=; h=X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:In-Reply-To:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE; b=TB4NqTm19rDDQnxEdChWR3oHQnLAdkuZVLcM2BtSTAwPmPUmnd2aSTWy1q1x9dDOXw/9I44dEODx4aRYzlLm/i9H4Ri0D5hMVG9GjR07UOmfFZOYLmIoNXM/doxwaQilIjLVFXS6s6zgS5pluryfonhDogbifnEtpwuLscMcAwI= X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: PrncO.cVM1nQnNTzrnY8WiCZ7wyyLza1NviCMv8iRDkTJMz UK7JkFMT2LVV4dWIRihHNEbVc2dL4w5xRSgS3X4oBh88NVMm9cPCaSD4vaPT mNgk57zegmOxUZb6IgBSImp7ggc29Z..wGkYViGpsPEGp8EkVtxzFhZXtIZy qeSP46BcgC79puXXnRyt1MGbQrNL0TTNqzYBJMoR..2cBruj5odG69IH4e1O mzkpshvACkUG5DAjT5sAhh54MRVxe.DtWvwoKQO8_jS3ZKKQzqtrvSwsnJRT _5iNgqeCAU6lNws2G15lTC69raFWCY7rTNhpqaPxlpz4todlEeglTSR.F23O cIMJFE6TJ7DH.RGSVwWaKU2WoEJ.Xxqqe1D5aqhhF7lzX005pIhr3UQ2LlaP g0wyfRHNwzQ4P_rJQTf0- X-Yahoo-SMTP: Cxhli3eswBD1ozmtAojhjrja86kWx0Qm9tycD5QR1DKWrOLgjJcXkw-- Received: from JimPC (james.moritz@86.135.149.173 with login) by smtp815.mail.ird.yahoo.com with SMTP; 16 Aug 2011 23:12:32 +0000 GMT Message-ID: <1FF2FAD9854F4890A338A9F862D93FE9@JimPC> From: "James Moritz" To: References: <68BE37BD69E54DEE89CEBA8E30E9B94E@PcMinto> <4E47FFE9.10100@iup.uni-heidelberg.de> <3ED8E5422F1F45DBB8186E9D9870AD63@PcMinto> <4E480E02.9020706@iup.uni-heidelberg.de> <938BF599006244949F6CDDB5BA91F347@PcMinto> <4E482FBD.7030402@freenet.de> <4E484183.9090805@iup.uni-heidelberg.de> <4E494A57.90105@freenet.de> <4E4956DA.1060201@iup.uni-heidelberg.de> <4E49643E.5090708@freenet.de> <4E496FF9.4040608@iup.uni-heidelberg.de> <0A4ED65EC3B244A3BD0DAD6ACFF43793@JimPC> <4E4A5597.4070709@iup.uni-heidelberg.de> <3746D901368F4C139E414F9110153EEE@JimPC> <4E4A9A1F.2060600@iup.uni-heidelberg.de> <1B55B625C3CD4D529EC361D9C5D79D96@JimPC> <4E4AD4C8.8000509@iup.uni-heidelberg.de> <4E4AEF31.5010306@iup.uni-heidelberg.de> In-Reply-To: <4E4AEF31.5010306@iup.uni-heidelberg.de> Date: Wed, 17 Aug 2011 00:13:02 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6002.18463 DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,UNPARSEABLE_RELAY=0.001 Subject: Re: LF: Ferrite RX antennas Content-Type: text/plain; format=flowed; charset="UTF-8"; reply-type=original Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.1 required=5.0 tests=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: 0:2:488275584:93952408 X-AOL-SCOLL-URL_COUNT: 0 X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-m010.2 ; domain : btopenworld.com DKIM : pass x-aol-sid: 3039ac1d40d54e4af9a7166f X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dear Stefan, Looking good so far... A Q of 486 is certainly reaching the point where it becomes inconvenient - but remember that it is easy to reduce Q (probably connecting a preamp, putting it in a container, etc, will reduce Q a bit anyway), and that the higher Q is, the better the SNR. So I would test it as an antenna with a preamp - if there is more SNR than you need, you could experiment with some damping resistance. Cheers, Jim Moritz 73 de M0BMU