Return-Path: Received: (qmail 12667 invoked from network); 9 Mar 1999 22:48:22 -0000 Received: from magnet.plus.net.uk (HELO magnet.force9.net) (195.166.128.26) by medusa.plus.net.uk with SMTP; 9 Mar 1999 22:48:22 -0000 Received: (qmail 11436 invoked from network); 9 Mar 1999 22:50:34 -0000 Received: from post.thorcom.com (194.75.130.70) by magnet.plus.net.uk with SMTP; 9 Mar 1999 22:50:34 -0000 Received: from troy.blacksheep.org ([194.75.183.50] ident=root) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10KVKf-0008Bq-00; Tue, 9 Mar 1999 22:50:37 +0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (from root@localhost) by troy.blacksheep.org (8.6.12/8.6.12) id WAA17711 for rsgb_lf_group-outgoing; Tue, 9 Mar 1999 22:47:29 GMT Received: from post.thorcom.com (root@post.unica.co.uk [194.75.183.70]) by troy.blacksheep.org (8.6.12/8.6.12) with ESMTP id WAA17690 for ; Tue, 9 Mar 1999 22:46:44 GMT Received: from arl-img-4.compuserve.com ([149.174.217.134]) by post.thorcom.com with esmtp (Exim 2.04 #3) id 10KVJq-00087s-00 for RSGB_LF_GROUP@BLACKSHEEP.ORG; Tue, 9 Mar 1999 22:49:46 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: (from mailgate@localhost) by arl-img-4.compuserve.com (8.8.6/8.8.6/2.18) id RAA22999 for RSGB_LF_GROUP@BLACKSHEEP.ORG; Tue, 9 Mar 1999 17:45:28 -0500 (EST) Date: Tue, 9 Mar 1999 17:45:08 -0500 From: "Peter Bobek" Subject: =?iso-8859-1?Q?LF:_Situation_at_DF2PY=B4s_QTH_=282nd_attempt=29?= To: "RSGB_LF_GROUP" Message-ID: <199903091745_MC2-6D62-C602@compuserve.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org Sorry, the message got chopped... Here it is again in full length (I hope at least...) 73, Peter/DJ8WL -------------Weitergeleitete Nachricht----------------- Von: Peter Bobek, An: RSGB_LF_GROUP, INTERNET:RSGB_LF_GROUP@BLACKSHEEP.ORG DF2PY - Wolf Ostwald, INTERNET:df2py@t-online.de Datum: 09.03.99 19:23 BE: Situation at DF2PY´s QTH Dear all, I am giving you this information to let you know that many of the problems at the QTH of DF2PY have been solved last weekend. It took Wolf and me several hours to find solutions and we have made great progress in Wolf´s ability to copy weak stations now One of the main problems was receiver front end overload (FT1000) caused by LF transmitters in this area. After adding some of the major necessary mods Wolf was able to see on screen (using my PC) and also hear stations from the UK, HB9 and DL which otherwise were not audible/visible. However, one of our biggest problems in this area remains unsolved: sideband-splatter from DLF (on 153 kHz) during periods of 100 % modulation. The band around 137 kHz is covered with about 10...12 db of hash noise which of course completely covers any weak signals which might be there... I am currently trying to find an elegant way how to convince the engi- neers at the DLF transmitter site to help us.... I have several recordings available as Bitmap-files showing this problem (in case someone is interested in seeing them). Stations in the UK are living with the LORAN-C sidelines but they can hear between the lines. Stations in DL in this area (Rhein-Main-Neckar region) have to live with the hash noise. But this is everywhere and there is even more "unfriendly" stuff from the LF transmitter site at Mainflingen. I hope you all see the efforts we are making in this area to improve the reception of weak signals on LF. Peter, DJ8WL / JN49JV (ex: DA0LF, on LF since June 1997)