Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9FC8938000092; Thu, 26 Apr 2012 16:22:43 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SNVC1-0005ei-SF for rs_out_1@blacksheep.org; Thu, 26 Apr 2012 21:21:33 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SNVC1-0005eZ-EL for rsgb_lf_group@blacksheep.org; Thu, 26 Apr 2012 21:21:33 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1SNVBz-0000fL-E2 for rsgb_lf_group@blacksheep.org; Thu, 26 Apr 2012 21:21:32 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id q3QKLTMF025674 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 26 Apr 2012 22:21:29 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id q3QKLTQt021598 for ; Thu, 26 Apr 2012 22:21:29 +0200 Message-ID: <4F99AE15.1000104@iup.uni-heidelberg.de> Date: Thu, 26 Apr 2012 22:20:37 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= 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: In-Reply-To: X-Spam-Score: -0.7 (/) 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: Hi Mauro, Am 26.04.2012 18:27, schrieb IK1WVQ Mauro: > Now in the 136.170 segment i receive ONLY DK7FC , with good signals > but with deep QSB .. > Now in the 137.700 segment NO ONE received station ... [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: e6de17d69e46ff4ea8db042ef2cd7e46 Subject: Re: LF: info about better digital mode in 2200m band Content-Type: text/plain; charset=ISO-8859-1; 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:433354496:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d604b4f99ae931ad0 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Mauro, Am 26.04.2012 18:27, schrieb IK1WVQ Mauro: > Now in the 136.170 segment i receive ONLY DK7FC , with good signals > but with deep QSB .. > Now in the 137.700 segment NO ONE received station ... Well, in the last weeks there was not really much activity. When you look to other grabbers there is only my signal too although many stations could be received... BUT i am quite sure that i saw DF6NM, G3KEV and G3XDV on your grabber some weeks back. Also i bet you will se IK1HSS and I5ZPO. I5ZPO should be audible. Have you ever tried to have a sked? > > I think my problem is the noisy urban environment, the 137.700 is more > noisy than 136.170 .. > > probably the PA0RDT makes intermodulation (a mistake was surely made: > in order to increase sensitivity I place a 60 cm "whip" wire other > than the PCB antenna), or my cable keeps noise (thanks Mike for this > info).. As Mike suggested, it is worth to concentrate on the EMC stuff, i.e. using a separate LF earth far away from thge house, using a common mode choke, lifting the antenna as high as possible... you know... A loop can be better but you have to live in a quiet location. My grabber is operated in a urban environment as well and a loop performed even worse... What i also can recommend is a wideband receiver, like http://icas.to/lineup/idc-136-kit-eng.htm produced by JA8SCD This kit is running at TF3HZ and performs very fine as we can see each day. Such a wideband RX allows a very good overview over several kHz (e.g. 130....154 kHz), so you can see if it is a broad band noise or DCF sidebands and so on. 73, Stefan/DK7FC