Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v9QFXWxn027305 for ; Thu, 26 Oct 2017 17:33:36 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1e7k3n-0000TE-US for rs_out_1@blacksheep.org; Thu, 26 Oct 2017 16:27:07 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1e7k3l-0000T5-Ce for rsgb_lf_group@blacksheep.org; Thu, 26 Oct 2017 16:27:05 +0100 Received: from mout.perfora.net ([74.208.4.194]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1e7k3i-0000lU-Ge for rsgb_lf_group@blacksheep.org; Thu, 26 Oct 2017 16:27:04 +0100 Received: from [192.168.1.125] ([72.224.254.201]) by mrelay.perfora.net (mreueus002 [74.208.5.2]) with ESMTPA (Nemesis) id 0Lx6n1-1d5PB43jUP-016iNk for ; Thu, 26 Oct 2017 17:27:00 +0200 To: rsgb_lf_group@blacksheep.org References: <4273a2ab-787c-d909-e7d0-d21db21ba18c@n1bug.com> <59EF0EDB.15093.422D52F1@mike.dennison.ntlworld.com> <59F05705.5020008@posteo.de> <59F1ADF3.16016.4C6AD4F6@mike.dennison.ntlworld.com> <6A5A0D655C1547DD91B4A70E43248F0D@DELL4> From: N1BUG Message-ID: <42e9950b-8ac9-4121-793b-3342e23571d5@n1bug.com> Date: Thu, 26 Oct 2017 11:26:58 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0 MIME-Version: 1.0 In-Reply-To: <6A5A0D655C1547DD91B4A70E43248F0D@DELL4> Content-Language: en-US X-Provags-ID: V03:K0:gSiJfbtcVlJfZ3epYNwme18qb/tQrrDeekACLzFKqh+X9auB0i3 JsXfM6ZBfuG0J/ZuNlFcRJ/0V1KKJ+ohnPHCwz9+hg+dzz4cJ1JXQyL+3LtGsFOIgeOG4AI Dyxf1gtILVCTj1XeL9bkp9yoxiX2ow9qVpVdRl4k8AyBit0XOqO1sMv25WBbbN0sFhb8/uT OKCaVrkutzJTR8G/VDDFg== X-UI-Out-Filterresults: notjunk:1;V01:K0:htHCMmav0Jk=:ubc9J87JinYiSIH9qkvnKL LAUVqkXeD6S8KOkG65xpqvOGQpkrkytHN535kCeKU6znNj4q2zpHg8nT9SGoZsyrpp4x5o/jH Od/v9ob1ucu4Da0fwKm3L22ga0y1u/Gu73IZPVHGwbtbBqsFAknyblIv6VE6BjS6wde6hnC+b FRLFengLuYO2jCrlcfDjtMNVLKKqSKlSnvdd+NyS3iyPb54zIv5umEmcU9zBwMvODUR/DJhY8 i3zbIa7s2zSVAbkx7GrTZqqvM8XO7g4T5dwUMbYSPiIEDvPagOg4157kV5r4SfX0vPANq+yfT BVIVWhCi9++E6x/Yj11ThgAVTh/z2PKQWbzkKt2GGTdSmZC69toI6OmdKPPqX3VBlcSYSTc7m iJrRudZ2Pwml9tf3+LCTDaWyhtY9alO6EHQiUN2L5rvYNE3Cygrz3fKcPdJqP2HSfgsQc1fUN aNvKltQJ/u28T6qxACAEQAVlFEYCeN+RLRPEziB7OXzinmfufvJ6z2m7/RgytEhsF0YwGBQZn WnElwjFGonXTWOfyy32khxFS5RqjPyom4pYirgQONZ8mVduai8mC8qizf6vxvFt8h7TnTVJf4 Z279uZ7FeeZ2t0Zzn7036N2ICgJbUAeAbr9LgkmB+kJDYO7cbgIDNqLsjgCGYxjsKtdZCXxOA PmE6m1PZ/+yzbZdJ2MBH78H+V2FLmhk++Rzl67oPg16lD7yO+fPBC2nhDb+QPOl2ymnsLe0Rj 5RkvrZNLq/RlicMxFRldEuznsGLYFhFxcapSiEDwNtCwUj1aGgBE0bbtQvo= X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Thanks Jay. I am far from knowledgeable about these materials but that agrees with measured performance of several receive bandpass filters I built for LF/MF last winter. I tried several different ferrite materials and 61 performed best. However I have no idea how that would compare to the powdered iron T50-2 normally used in this circuit. In the long run I think I may order a couple more LPF kits and build one both ways for comparison. Who knows, I may learn something! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: Monitoring 2190m WSPR Content-Type: text/plain; charset=utf-8; format=flowed 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=0.0 required=5.0 tests=none 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 Thanks Jay. I am far from knowledgeable about these materials but that agrees with measured performance of several receive bandpass filters I built for LF/MF last winter. I tried several different ferrite materials and 61 performed best. However I have no idea how that would compare to the powdered iron T50-2 normally used in this circuit. In the long run I think I may order a couple more LPF kits and build one both ways for comparison. Who knows, I may learn something! 73, Paul N1BUG WI2XTC On 10/26/2017 10:46 AM, jrusgrove@comcast.net wrote: > Paul > > 61 material has the best Q of any of the ferrite materials (that I'm aware of) at LF/MF. Can't say > whether or not the change to a different coil would be appropriate in that circuit. > > Jay W1VD WD2XNS WE2XGR/2