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[195.171.43.25]) by mx.google.com with ESMTP id x9si3352057wia.56.2013.07.14.03.21.53 for ; Sun, 14 Jul 2013 03:21:54 -0700 (PDT) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UyJ0Z-0003Xs-O0 for rs_out_1@blacksheep.org; Sun, 14 Jul 2013 10:54:23 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UyJ0Z-0003Xj-8s for rsgb_lf_group@blacksheep.org; Sun, 14 Jul 2013 10:54:23 +0100 Received: from smtp-vbr5.xs4all.nl ([194.109.24.25]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UyJ0X-0000tN-P4 for rsgb_lf_group@blacksheep.org; Sun, 14 Jul 2013 10:54:22 +0100 Received: from pc-roelof (ndb.demon.nl [82.161.81.65]) by smtp-vbr5.xs4all.nl (8.13.8/8.13.8) with ESMTP id r6E9sACE053762 for ; Sun, 14 Jul 2013 11:54:20 +0200 (CEST) (envelope-from roelof@ndb.demon.nl) To: rsgb_lf_group@blacksheep.org References: <005b01ce798a$b0476600$6d01a8c0@DELL4> <20130706131640.GG5246@cs.utwente.nl> <7D6B8CBB38964C9C82487F5D0F3648FC@FMVXD1232> <20130707203537.GA30691@cs.utwente.nl> <51DA00C8.6000600@iup.uni-heidelberg.de> <51DA0212.8020808@iup.uni-heidelberg.de> <51DA03CE.6020508@iup.uni-heidelberg.de> <51DA1680.6030602@iup.uni-heidelberg.de> <51DB6CB3.2080708@iup.uni-heidelberg.de> <001601ce7c95$f235b360$6401a8c0@JAYDELL> <51DBFF7D.9050807@iup.uni-heidelberg.de> <51DC58E9.5030005@iup.uni-heidelberg.de> <51DF1D06.8020208@iup.uni-heidelberg.de> <51DF43E7.8080300@iup.uni-heidelberg.de> <51E147E2.8080302@iup.uni-heidelberg.de> <002701ce7ff5$714bc830$53e35890$@nifty.com> <51E1DDDF.3020904@iup.uni-heidelberg.de> Date: Sun, 14 Jul 2013 11:54:09 +0200 MIME-Version: 1.0 From: "Roelof Bakker" Message-ID: In-Reply-To: <51E1DDDF.3020904@iup.uni-heidelberg.de> User-Agent: Opera Mail/12.16 (Win32) X-Virus-Scanned: by XS4ALL Virus Scanner X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Hideho, Stefan, An other way to look at local noise received on the probe is that local noise is traveling over the shield of the coax to the antenna and is picked up by it. When you ground the shield of the coax e.g. when it enters the house or at the bottom of the mast the local noise flows to earth and does not reach the antenna. I just checked it at 475.1 kHz and it makes a difference of 8 dB, when the shield of the coax is grounded either just before entering the house or at the bottom of the mast. This is a big difference, enabling weak signal work or not! [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [194.109.24.25 listed in list.dnswl.org] X-Scan-Signature: 0b2d339ae1d48966556dfb6ad64e2bce Content-Type: text/plain; charset=iso-8859-15; format=flowed; delsp=yes Subject: Re: LF: Re: MiniWhip antenna, fiber optic TEST SIGNALS NEEDED on 630m WSPR 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 Status: O X-Status: X-Keywords: X-UID: 2825 Hello Hideho, Stefan, An other way to look at local noise received on the probe is that local noise is traveling over the shield of the coax to the antenna and is picked up by it. When you ground the shield of the coax e.g. when it enters the house or at the bottom of the mast the local noise flows to earth and does not reach the antenna. I just checked it at 475.1 kHz and it makes a difference of 8 dB, when the shield of the coax is grounded either just before entering the house or at the bottom of the mast. This is a big difference, enabling weak signal work or not! The same applies for apartment dwellers with a balcony mounted antenna. 73, Roelof, pa0rdt