Return-Path: Received: (qmail 20114 invoked from network); 8 Apr 2002 16:08:03 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 8 Apr 2002 16:08:03 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 19667 invoked from network); 8 Apr 2002 14:04:08 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 8 Apr 2002 14:04:08 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16ubEz-0004b9-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 08 Apr 2002 16:39:33 +0100 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16ubEy-0004b4-00 for rsgb_lf_group@blacksheep.org; Mon, 08 Apr 2002 16:39:32 +0100 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 16uZi4-0001Em-00 for rsgb_lf_group@blacksheep.org; Mon, 08 Apr 2002 15:01:28 +0100 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 16uZi3-0002QN-00 for rsgb_lf_group@blacksheep.org; Mon, 08 Apr 2002 15:01:27 +0100 Message-ID: <5.1.0.14.0.20020408143832.00a7b240@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Mon, 08 Apr 2002 14:56:02 +0100 To: rsgb_lf_group@blacksheep.org From: "James Moritz" Subject: Re: LF: QRSS In-reply-to: References: <3.0.1.16.20020326101024.2d07bb30@pb623250.kuleuven.be> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Dear Alex, LF Group, At 04:18 PM 08/04/2002 +0000, you wrote: >When trying to recive RU6 signals I have hear someone similar DCF39 about >138.83 kHz. But delay between 'RTTY bursts'is not 10 sec. but about 18 >sec. Sometimes the delay is about 4 sec. but not often. I wonder is this >stn DFC39 indeed? Yes, that sounds like it - the data telegrams are not transmitted at equal intervals > I copy this stn (audibaly) very nice at night time. I do not measure >S/N ratio but its seems to be 15 dB or more... My input filter (135.5 .. >137.8 kHz) reject 138.83 kHz about 10 dB. So real S/N is more 25 dB! The ERP of DCF39 is about 40kW I think (+46dBW) - so the S/N with a 0dBW ERP amateur signal should be about -21dB. Assuming this is in a bandwidth of around 300Hz, you should in theory be able to copy QRSS with fairly long dot lengths, such as 30s, over the same distance, if your RX has good frequency stability. > Unfortunely I do not hear this stn in day time. Also I can not hear >it at evening (befor 01 or 02 local) because of very strong industrial >QRM (TV sets I think). I think many of us have these problems... > I wonder also does DCF39 radiate all the time or part of time only? Almost all the time - it occasionally goes QRT, probably just for maintenance. Cheers, Jim Moritz 73 de M0BMU