Return-Path: Received: (qmail 33951 invoked from network); 4 Jun 2004 19:57:14 -0000 Received: from unknown (HELO ptb-mxscan01.plus.net) (212.159.14.235) by ptb-mailstore02.plus.net with SMTP; 4 Jun 2004 19:57:14 -0000 Received: (qmail 39744 invoked from network); 4 Jun 2004 19:57:13 -0000 X-Filtered-by: Plusnet (hmail v1.01) X-Spam-detection-level: 11 Received: from ptb-mxcore01.plus.net (212.159.14.215) by ptb-mxscan01.plus.net with SMTP; 4 Jun 2004 19:57:11 -0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore01.plus.net with esmtp (Exim 4.30; FreeBSD) id 1BWKoR-000ADU-PM for dave@picks.force9.co.uk; Fri, 04 Jun 2004 19:57:11 +0000 X-Fake-Domain: majordom Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1BWKnS-0005q4-HT for rs_out_1@blacksheep.org; Fri, 04 Jun 2004 20:56:10 +0100 Received: from [213.232.95.59] (helo=relay.salmark.net) by post.thorcom.com with esmtp (Exim 4.14) id 1BWKnS-0005pv-3W for rsgb_lf_group@blacksheep.org; Fri, 04 Jun 2004 20:56:10 +0100 Received: from mailout03.sul.t-online.com ([194.25.134.81]) by relay.salmark.net with esmtp (Exim 4.24) id 1BWRLy-0006Bj-Bf for rsgb_lf_group@blacksheep.org; Sat, 05 Jun 2004 03:56:14 +0100 X-Fake-Domain: fwd08.aul.t-online.de Received: from fwd08.aul.t-online.de by mailout03.sul.t-online.com with smtp id 1BWKnN-00006E-00; Fri, 04 Jun 2004 21:56:05 +0200 X-Fake-Domain: (SgOczQZeZeDCZ-ur88G4ys1NsIOa4+fLmsHDwN2ow0mT-gUFPLVa8Y@[217.251.191.185]) Received: from (SgOczQZeZeDCZ-ur88G4ys1NsIOa4+fLmsHDwN2ow0mT-gUFPLVa8Y@[217.251.191.185]) by fwd08.sul.t-online.com with smtp id 1BWKnJ-2BxJCq0; Fri, 4 Jun 2004 21:56:01 +0200 From: jannsen <0482183881-0001@t-online.de> To: rsgb_lf_group@blacksheep.org References: <1BRHm7-0fUSWm0@fwd01.sul.t-online.com> <000b01c43fdb$02f64c20$b4a27ad5@rogersservices> X-Mailer: T-Online eMail 2.34 MIME-Version: 1.0 Date: Fri, 4 Jun 2004 21:56:01 +0200 Message-ID: <1BWKnJ-2BxJCq0@fwd08.sul.t-online.com> X-Seen: false X-ID: SgOczQZeZeDCZ-ur88G4ys1NsIOa4+fLmsHDwN2ow0mT-gUFPLVa8Y X-Spam-Score: 2.5 (++) X-Spam-Report: autolearn=no,FROM_ENDS_IN_NUMS=0.869,FROM_STARTS_WITH_NUMS=1.574,TW_QR=0.077 Subject: Re: LF: RE: looking for first signals ... 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-Level: ** X-Spam-Status: No, hits=2.4 required=5.0 tests=FROM_ENDS_IN_NUMS, FROM_STARTS_WITH_NUMS 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-PN-SPAMFiltered: yes X-Spam-Rating: 1 James Moritz schrieb: > > > Hi Jim, > > > > your PSK signs are audible in jo43sv. but qrn makes them almost > unreadable. > > see attachment. > > > > btw. what type of transmitter do you use for the PSK mode? > > > > Uwe/dj8wx > Dear Uwe, LF Group, > > Thanks for the report - I transmitted CW/QRSS3 from 1900 - 2100 and 2200 - > 2300, and PSK31 from 2100 - 2200. As you observed, the drawback of PSK31 on > LF is that every QRN impulse gives you a 50-50 chance of corrupting a bit, > and so losing the character. A mode using error correction works better - > like VE2IQ's "Coherent" program for example. > > The TX in use here is the usual class D Decca PA - to get a clean signal, I > use an "envelope elimination and restoration" scheme, where the 136kHz drive > to the PA is phase modulated, and amplitude modulation is applied to the DC > feed to the PA. The phase keying signal is generated by the "Digimode > terminal" in DL4YHF's Spectrum Lab software, and the envelope waveform is > generated from the phase signal by external hardware. > > Cheers, Jim Moritz > > 73 de M0BMU Dear Jim, I got some questions conc your TX. did you receive my direct mail dated 25th of May ? regards Uwe/dj8wx