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 w2GCHiA2010255 for ; Fri, 16 Mar 2018 13:17:47 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ewoEU-0008Ns-TV for rs_out_1@blacksheep.org; Fri, 16 Mar 2018 12:13:14 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ewoEU-0008Nj-AF for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 12:13:14 +0000 Received: from mout.perfora.net ([74.208.4.197]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1ewoEO-0005W4-LF for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 12:13:13 +0000 Received: from [192.168.1.127] ([72.224.254.201]) by mrelay.perfora.net (mreueus001 [74.208.5.2]) with ESMTPA (Nemesis) id 0M5fQc-1ehKe11Rxg-00xaCH for ; Fri, 16 Mar 2018 13:13:05 +0100 To: rsgb_lf_group@blacksheep.org References: <772364530.20180316113613@gmail.com> From: N1BUG Message-ID: Date: Fri, 16 Mar 2018 08:13:04 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <772364530.20180316113613@gmail.com> Content-Language: en-US X-Provags-ID: V03:K0:z/9hXd1XeoX6zRXqiUmuKaeKGzruiyyBvhUUBY/Y5X5NCWbJwdU A5Us+uyFTUadYkVSHS81IbJUrZUdlQ0DQDpz7CBfHXQssRQmwkjJ8epzKN9k0a+kQvh4hza 27suve8i1TuzdhLEwviS91a8FVBa1Bq1/H56PuYguoObqOJ4IS3tQyo0bahrVa0+fg0YdvY H4WRlMa6mljYBcjWrHnjQ== X-UI-Out-Filterresults: notjunk:1;V01:K0:Q89WfveD4wM=:wAFlHYsK7STLaf9HCe1k+p grwGh9uOjH9UDxvkK1Evk72Hht3C7TovXmQxg3WfMX/O6hSeSOTkpCJNrbLZO/VyOiz9BhWIx EQp8UouSfFFcy78RvyoQHiXw5mFMHRyqmzQZAFvhiZAvT4jckx7SsZTiuU5FkVqkqFNolTki2 gATfTg7qSR74Mw5Zvrtb4GdkqzAdJYUHlfOU4xInkf6WCfaM7pDZOZUNEDZIcGMsH7+dpm8a+ ENjmZtQ7fX70cFpY1Y3ZUaWRjO2g00KfQQZzlludtCWF6ZZr2+E/G1/CKaDa1D+ol4akkHCcw GQIH4YQ4ZSSlGy2eJ98QZSvylbRxP5c3uzjaz9nmrBrox6uAQbBItCP+59J91d7J1pNh1KjzL ghU1MWjc2fsFYDsCP0JRQ+Xb491PqFrgt3t7U7tHwyByntlQz9K5Cvi4NCJ9Dyilhb7HFEO2A IQD1VOPdqGwtnrTXCgxDyeb/q9QztF5Fkr6hCeukbQg6Zi0/NIkQDITBJhooeO3gKzvsTSj0D QSSZag/7k4lMGqExgTXar2ztSjg2TP7f34x/4UE1H7nzkrbwh2a5vLfgI3dImeBMfBP4JLflD E8n1nFBqslKo+RH1MgA/q9w4DErUHMqMBaphhVdkKT5ns8waIv/J9D/HIC7jAF0hBfqnSsLxQ y74Y6yS0q/qbtJN+9GAWaXn7CO4dI3vQiVUlSwFBMyGP8TjYPRlQ3mQ2JGWTEl9XjRzekmne2 l6h2Gb2Tj4N3SzsMQIH7UHGxlS/sjNZa9xQB2c5V/f7s30JRlkqKHfPinBw= X-Spam-Score: 0.7 (/) 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: I say BPF first, then preamp (at least for LF/MF work). Strong out of band signals can cause all sorts of problems. Best to filter them before amplifying. I believe the small amount of loss in a good BPF is insignificant at low frequencies. I have found this to be true using my LNV antenna. [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.6 URIBL_SBL Contains an URL's NS IP listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] 0.1 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: www.n1bug.com] X-Scan-Signature: e90dcb17768c7e768f13e0721cc1c0c7 Subject: Re: LF: Pre amp *after* BPF?? Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit 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 I say BPF first, then preamp (at least for LF/MF work). Strong out of band signals can cause all sorts of problems. Best to filter them before amplifying. I believe the small amount of loss in a good BPF is insignificant at low frequencies. I have found this to be true using my LNV antenna. http://www.n1bug.com/lfmf/LF_MF_Receiving_System.png 73, Paul N1BUG On 03/16/2018 07:36 AM, Chris Wilson wrote: > > > Hello LF'ers, > > Been Googling and see a mixed response to should a receive pre-amp go > before or after a BPF. I have mine before the pre-amp, does the panel > concur with this being correct? Thanks! > > Aerial, isolation transformer for ground loops, BPF, pre-amp, Red > Pitaya as the LF receiver.