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 w6GC6rMR001422 for ; Mon, 16 Jul 2018 14:06:56 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ff2Bb-0007Y3-HO for rs_out_1@blacksheep.org; Mon, 16 Jul 2018 13:01:03 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ff2BW-0007Xk-5p for rsgb_lf_group@blacksheep.org; Mon, 16 Jul 2018 13:00:58 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1ff2BU-0006c1-9X for rsgb_lf_group@blacksheep.org; Mon, 16 Jul 2018 13:00:57 +0100 Received: from submission (posteo.de [89.146.220.130]) by mout01.posteo.de (Postfix) with ESMTPS id AC66420F07 for ; Mon, 16 Jul 2018 14:00:52 +0200 (CEST) X-DKIM-Result: Domain=posteo.de Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.de; s=2017; t=1531742452; bh=Is0PS4WhYDQUeBiWHj7lx8uzj67fqSEcGQyihMsrVx4=; h=Date:From:To:Subject:From; b=hbzQax5ANFcBcMzulk2JYoM3GUaw/fhvg2CCMxko3BjO0ANsuHgqByLiNludNa0qv LY4r8ljKJDC6IW/FPk9IesULcuI1d9YgEaOwlOqC73gjCpKIzBt3YgCZsZkhLLllyU bhjW07qjMj3xCTISZFdpb8J00Hs140a1YrOhE+RZsoKhD3Qv2HJ5ESVSPCxvtOoUm5 3nS4q3B7OpGH94SKO76L67JJfl4NLMG3BjlwDAn7GmiasThqu+G+AkwFCk93eK5Pgm c6IKpg3RpUvcb9Sbd2W4XA+gY2r8GK2O1Ns2exY/TR+YwqckxYvAZVN6q3RLmmG0EL MQj5MSUSy0x3A== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 41ThnX1QZ4z9rxF for ; Mon, 16 Jul 2018 14:00:47 +0200 (CEST) Message-ID: <5B4C88EF.1090800@posteo.de> Date: Mon, 16 Jul 2018 14:00:47 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <806f6cb0-fac1-64cc-95b6-0c2c5277f8d8@n1bug.com> <5B4C78A7.1010208@posteo.de> <19bdcc7f-1f73-8660-420a-0858bd24beaf@n1bug.com> In-Reply-To: <19bdcc7f-1f73-8660-420a-0858bd24beaf@n1bug.com> X-Spam-Score: -2.3 (--) 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 @@CONTACT_ADDRESS@@ for details. Content preview: Am 16.07.2018 13:49, schrieb N1BUG: > I don't know if this is correct but I read that for optimum S/N one > should have 10 dB noise increase on the antenna when compared to a > 50 ohm termination. Yes, 10 dB at least, better more. What type of preamp are you using (schematic?). For a comparison with and without antenna, you need to replace the antenna wire with a capacitor of the same C (assume 5...6 pF/m antenna wire, i.e. use 56 pF to replace a 10m vertical) connected to the preamp. If this shows as e.g. -120 dBfs it should show -105 dBfs with the antennna connected. 73, Stefan [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [185.67.36.65 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: cc2e5baae40f8f7a09b47e6877ef0bfb Subject: Re: LF: TX > RX isolation test 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 Am 16.07.2018 13:49, schrieb N1BUG: > I don't know if this is correct but I read that for optimum S/N one > should have 10 dB noise increase on the antenna when compared to a > 50 ohm termination. Yes, 10 dB at least, better more. What type of preamp are you using (schematic?). For a comparison with and without antenna, you need to replace the antenna wire with a capacitor of the same C (assume 5...6 pF/m antenna wire, i.e. use 56 pF to replace a 10m vertical) connected to the preamp. If this shows as e.g. -120 dBfs it should show -105 dBfs with the antennna connected. 73, Stefan