Return-Path: Received: (qmail 23359 invoked from network); 26 Mar 2002 09:21:47 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by exhibition.plus.net with SMTP; 26 Mar 2002 09:21:47 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 23675 invoked from network); 26 Mar 2002 09:21:38 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 26 Mar 2002 09:21:38 -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 16poaJ-0007Iu-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 26 Mar 2002 10:53:47 +0000 Received: from mail2.cc.kuleuven.ac.be ([134.58.10.50]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16poaH-0007Ip-00 for rsgb_lf_group@blacksheep.org; Tue, 26 Mar 2002 10:53:45 +0000 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail2.cc.kuleuven.ac.be (8.12.1/8.12.1) with SMTP id g2Q9FBgv172860 for ; Tue, 26 Mar 2002 10:15:12 +0100 Message-ID: <3.0.1.16.20020326101024.2d07bb30@pb623250.kuleuven.be> X-Sender: pb623250@pb623250.kuleuven.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Tue, 26 Mar 2002 10:10:24 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: QRSS In-reply-to: References: <3.0.1.16.20020325165932.307f141a@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: Hello Alex, As you noticed there is a lot of interest from Europe in your LF activities. If you are able to put 50 .. 100mW ERP in the air I would recommend at least 30 second dotlength for QRSS, if the signal turns out to be strong you can always go to shorter dotlengths. If you prefer not to use a PC to transmit QRSS you can indeed program a PIC, it will be OK for beacon transmissions but might be a bit complicated for a 2-way QSO to change the text. Anyway, if you want to make a 2-way QRSS QSO you will need a PC for receiving the signals. Another alternative to transmit QRSS is to use a normal memory keyer and add a large capacitance to the timer of the keyer to slow it down. I believe G3XDV did this with success. If you are ready for receiving I would recommend to try to copy DCF39 on 138.830kHz. This commercial station runs about 30kW ERP and is located near Magdeburg (Germany, JO52WG). It transmits a carrier that is interrupted by a kind of 'RTTY burst' every 10 seconds. Amateur signals on 136kHz are about 45 to 55dB weaker (7 to 9 s-points), so you would need to copy DCF39 at 45dB SNR to be able to copy an amateur station in CW. Fortunately we can win a lot of dB using QRSS, if you copy DCF39 at 30dB SNR you have a good chance to be able to see QRSS3 signals (QRSS at 3 sec. dotlength), at 20dB SNR it is worth to try QRSS30 and QRSS120 would require only 14dB SNR. Regarding TX and RX equipement for 136kHz, there is a lot of information on the web. I have an overview of these websites at : http://www.qsl.net/on7yd/136brew.htm 73, Rik ON7YD