Return-Path: Received: (qmail 8544 invoked from network); 14 Apr 2005 14:26:34 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore04.plus.net with SMTP; 14 Apr 2005 14:26:34 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1DM5Kn-000JKM-8J for dave@picks.force9.co.uk; Thu, 14 Apr 2005 15:28:48 +0100 Received: from [192.168.101.78] (helo=pih-mxcore12.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1DM5Kj-000JIs-00 for dave@picks.force9.co.uk; Thu, 14 Apr 2005 15:28:41 +0100 Received: from post.thorcom.com ([193.82.116.20]) by pih-mxcore12.plus.net with esmtp (PlusNet MXCore v1.0) id 1DM74P-0003Rh-Ba for dave@picks.force9.co.uk; Thu, 14 Apr 2005 17:19:57 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1DM5Hp-0001Ae-BC for rs_out_1@blacksheep.org; Thu, 14 Apr 2005 15:25:41 +0100 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1DM5Ho-0001AV-WA for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2005 15:25:40 +0100 Received: from smtp.wp.pl ([212.77.101.1]) by relay.thorcom.net with esmtp (Exim 4.43) id 1DM5Hn-0006t2-M5 for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2005 15:25:40 +0100 Received: (wp-smtpd smtp.wp.pl 12439 invoked from network); 14 Apr 2005 16:25:33 +0200 Received: from miglanc.socrates.org.pl (HELO [192.168.1.39]) (sq5bpm@[194.181.189.2]) (envelope-sender ) by smtp.wp.pl (WP-SMTPD) with AES256-SHA encrypted SMTP for ; 14 Apr 2005 16:25:33 +0200 Message-ID: <425E7D5C.8090407@wp.pl> Date: Thu, 14 Apr 2005 16:25:32 +0200 From: Marek SQ5BPM User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317) X-Accept-Language: en-us, en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <12b.5b065c0c.2f8fc69d@aol.com> In-Reply-To: <12b.5b065c0c.2f8fc69d@aol.com> X-WP-AV: skaner antywirusowy poczty Wirtualnej Polski S. A. X-WP-SPAM: NO AS1=NO(Body=1 Fuz1=1 Fuz2=1) AS2=NO(0.930533) AS3=NO AS4=NO X-SPF-Result: relay.thorcom.net: domain of wp.pl designates 212.77.101.1 as permitted sender X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=failed,none Subject: Re: LF: LF and JT65 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) G0MRF@aol.com wrote: > Forwarded on behalf of Andy Talbot G4JNT > > Re JT65 and LF > > [...] > > Some years ago, Alberto introduced us to Jason, but even that is an > incoherent mode and doesn't make the most of the LF path. But if the > error > correction capabilities of JT65, were used with a reduced synchronisation > vector allowed for by better frequency accuracy, and with the tone / > symbol > spacing of Jason we may be geting something formidable. > > BUT it is still incoherent.[...] Some time ago I sent to the group information about Olivia mode, which already uses an interesting error correction scheme. This mode could be possibly re-worked for much lower bandwidth and throughput, some extra possibilities of coherent reception could be added as well. Subsequent tones do not need to overlap as they do in original Olivia, if it's to be used with non-linear power amplifiers. One could also start with Jason and add the error correction used in Olivia... 73! Marek SQ5BPM