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 w2GD5ONs010430 for ; Fri, 16 Mar 2018 14:05:25 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ewoyV-0000NG-ID for rs_out_1@blacksheep.org; Fri, 16 Mar 2018 13:00:47 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ewoyV-0000N6-4e for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 13:00:47 +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 1ewoyQ-0005rQ-AF for rsgb_lf_group@blacksheep.org; Fri, 16 Mar 2018 13:00:45 +0000 Received: from [192.168.1.127] ([72.224.254.201]) by mrelay.perfora.net (mreueus003 [74.208.5.2]) with ESMTPA (Nemesis) id 0LxMyK-1eXwNw3atm-016wFr for ; Fri, 16 Mar 2018 14:00:39 +0100 To: rsgb_lf_group@blacksheep.org References: <772364530.20180316113613@gmail.com> <1521203464226.5324@kuleuven.be> From: N1BUG Message-ID: Date: Fri, 16 Mar 2018 09:00:37 -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: <1521203464226.5324@kuleuven.be> Content-Language: en-US X-Provags-ID: V03:K0:Gg4XQkKsuejY05Zx9DB+DGFaGFbPAB/es1MrSv1mCHs4cYYphrI vCCpkmoUO9XU+smcR7wpqK/RHdJNojDSQpb6xMws+mMPs7vhWBCh66ZSEYmPauALdKn0FuZ sq2LTxCDdPUUmzOYEUeTQS4RYhjS+1Ptb1SPKTglDLIRK814bYuqmCaMQdVZUh4kejc/fTR OtkPUWGaCQDfOHMknGpmA== X-UI-Out-Filterresults: notjunk:1;V01:K0:cx9xnkcjWzU=:V+QOgnkyxNfwmZdf0Iv+Ri NzFKFy/8GzBCQLjYcvLmAqOUFUV+jv0M8L37+/Okzjd3zkI7lfcQypvduHGJs0Ol3uP20XKaa 8MiAY8nKjCB1HtziKQ2+dksG6ofqSKff1nkil8ykfNiZfyOLLXWOddO5xBpY+qvf0fH6wm3WG geO1Nx6W8YJAq33JbgG9nmDc+dBdIMXgQIVPrJxj/MkVxkGBQosNBlBWNSP3Qb6F4bPWp26Kz 2knHRHcyLT9k25C4KwhXL04i9FZDfsghltavn0PcuisUSva44GPhKdkMQqHS3zefoLlwdDjrQ eunYadsK0V1pxewmcI2fyrf3ZWYOb+xygFE9JdbUr3i/RpdwSVkYmGl1rrT/TfSuGuyFDBLP3 JmeB1PycFu+PQbmzDR7gBVEvMjzI3sBJ3RoskEl1Cz86xjMwQTpNRM0ckGdxYyTBWwGhXzxMC B+BhuWhwO15hGu140PM28SCSWMoA0I+Vhkv49qV3M8OlXxn1xiv7kcdJ1Y1D2OWwcuKfWPAlA y6pdQWzXsDDbQ/JeKLqRo08ox6XJFnuoFJwQJ5FNMk37G82aLbZ2uv9aGq7t9OqHoSGP0/JIN n1377BJdj5l/wv9v12PP4i81OUOMDXaeTsxBi8lbt/JdLSg8nD7zo5ioSHOnqo0rhAtR81bfR +ZcMa638i8xaKnBhQtIe7o8W7cuPGu0VvX5yhuXf+XG3IcCGIQ0j9K8S5Q5LWhJtIAt9+rTxX 3qslZPfqmC27p8WhuttY6Ajooxe5Qg//t5sQvHU+DRzQPoKPjMmv7oQZQOA= 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: Good point, Rik. I agree. The reason I run preamps is that with the LNV antenna my receivers failed this test without it. :-) 73, Paul N1BUG [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: e90dcb17768c7e768f13e0721cc1c0c7 Subject: Re: LF: Pre amp *after* BPF?? Content-Type: text/plain; charset=windows-1252 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 Good point, Rik. I agree. The reason I run preamps is that with the LNV antenna my receivers failed this test without it. :-) 73, Paul N1BUG On 03/16/2018 08:31 AM, Rik Strobbe wrote: > Keep in mind that you only need a pre amp if the "antenna noise" is > below the receiver noise. > > Most receivers have reduced sensitivity at LF / MF, but the > noiselevels at these frequencies is high compared to HF. > > Easy to check: Listen (with connected antenna) on a quiet frequency > (only noise, no signal). Next disconnect the antenna. If the noise > level decreases you do not need a pre amp (in fact a pre amp will > only deteriorate the IMD behavior and thus create more ghost signals). > > > 73, Rik  ON7YD - OR7T