Return-Path: Received: (qmail 33788 invoked from network); 15 Jan 2004 08:56:59 -0000 Received: from unknown (HELO ptb-mxscan02.plus.net) (212.159.14.236) by ptb-mailstore01.plus.net with SMTP; 15 Jan 2004 08:56:59 -0000 Received: (qmail 13879 invoked from network); 15 Jan 2004 08:56:59 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 X-Priority: 3 X-MSMail-Priority: Normal Received: from ptb-mxcore02.plus.net (212.159.14.216) by ptb-mxscan02.plus.net with SMTP; 15 Jan 2004 08:56:58 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1Ah3JB-0003Uy-R6 for dave@picks.force9.co.uk; Thu, 15 Jan 2004 08:56:57 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Ah3IT-0006l4-L7 for rs_out@blacksheep.org; Thu, 15 Jan 2004 08:56:13 +0000 Received: from [134.58.240.45] (helo=thumbler.kulnet.kuleuven.ac.be) by post.thorcom.com with esmtp (Exim 4.14) id 1Ah3IS-0006kv-HS for rsgb_lf_group@blacksheep.org; Thu, 15 Jan 2004 08:56:12 +0000 Received: from localhost (localhost [127.0.0.1]) by thumbler.kulnet.kuleuven.ac.be (Postfix) with ESMTP id 567D3137835 for ; Thu, 15 Jan 2004 09:55:42 +0100 (CET) Received: from lepidus.kulnet.kuleuven.ac.be (lepidus.kulnet.kuleuven.ac.be [134.58.240.72]) by thumbler.kulnet.kuleuven.ac.be (Postfix) with ESMTP id BD3F11377E3 for ; Thu, 15 Jan 2004 09:55:41 +0100 (CET) X-Fake-Domain: dell-rik.fys.kuleuven.ac.be Received: from dell-rik.fys.kuleuven.ac.be (pc-10-33-165-177.fys.kuleuven.ac.be [10.33.165.177]) by lepidus.kulnet.kuleuven.ac.be (Postfix) with ESMTP id A986B380151 for ; Thu, 15 Jan 2004 09:55:41 +0100 (CET) Message-ID: <5.1.0.14.0.20040115093254.00baa4b0@u0019445.kuleuven.be> X-Sender: u0019445@u0019445.kuleuven.be X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 15 Jan 2004 09:58:22 +0100 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" In-reply-to: <014001c3dac5$075aceb0$f89a8418@Peter> MIME-Version: 1.0 X-Virus-Scanned: by KULeuven Antivirus Cluster Subject: Re: LF: lf andnoise and offshore. Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.60 (1.212-2003-09-23-exp) on post.thorcom.com X-Spam-Status: No, hits=0.0 required=5.0 tests=HTML_MESSAGE autolearn=no version=2.60 X-SA-Exim-Scanned: Yes Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-PN-SPAMFiltered: yes X-Spam-Rating: 1 Content-transfer-encoding: 8bit

What is the longest sec/dot size that is used on amateur LF ?
I noted that Rik's QRS program offers up to 60 sec per dot.
Are there programs with much longer sec/dot times out there ?

Hi Peter,

You must have found a very old version of QRS (2.05 or even older).
Versions from 3.05 upward support up to 3600 sec dotlength (= 1 hour).

The latest version of QRS can be downloaded at various places :
G3YXM : http://www.wireless.org.uk/software.htm
LWCA : http://www.lwca.org/library/software/index.htm
NL9222 : http://home.wanadoo.nl/nl9222/software.htm
ON7YD : http://www.qsl.net/on7yd/ (click on software)

73, Rik ON7YD

PS :
If there is any need I am willing to extend the maximum dotlength, if someone can convince me of the use of it.
I believe the ultimate limit can be calculated as :

Ham gets licenced at the age of 16 and dies at the age of 100 (I'm an optimist), so his "ham life" is 84 years (= +/- 44000000 minutes)
An average QRSS QSO at 3 sec/dot takes 25 minutes
A dotlength of +/- 5280000 seconds (= +/- 2 months) would allow an average QRSS QSO in a span of 84 years

This would improve SNR by 62 dB (+/- 10 S-points) over QRSS3 but would require a TX and RX stability of 0.2 µHz (micro-Herz). Also forget about ionospheric propagation as the doppler-shift will ruin everything.