Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w1RDu8QM005576 for ; Tue, 27 Feb 2018 14:56:11 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eqff1-0004Tg-UD for rs_out_1@blacksheep.org; Tue, 27 Feb 2018 13:51:15 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eqff1-0004TX-Ja for rsgb_lf_group@blacksheep.org; Tue, 27 Feb 2018 13:51:15 +0000 Received: from rhcavuit03.kulnet.kuleuven.be ([2a02:2c40:0:c0::25:136]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eqfey-0000xp-Ss for rsgb_lf_group@blacksheep.org; Tue, 27 Feb 2018 13:51:14 +0000 X-KULeuven-Envelope-From: rik.strobbe@kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 4F127120364.A516F X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-2.cc.kuleuven.be (icts-p-smtps-2e.kulnet.kuleuven.be [134.58.240.34]) by rhcavuit03.kulnet.kuleuven.be (Postfix) with ESMTP id 4F127120364 for ; Tue, 27 Feb 2018 14:51:06 +0100 (CET) Received: from ICTS-S-EXMBX24.luna.kuleuven.be (icts-s-exmbx24.luna.kuleuven.be [10.112.11.59]) (using TLSv1.2 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by icts-p-smtps-2.cc.kuleuven.be (Postfix) with ESMTPS id 4B14C2003B; Tue, 27 Feb 2018 14:51:06 +0100 (CET) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX24.luna.kuleuven.be (10.112.11.59) with Microsoft SMTP Server (TLS) id 15.0.1320.4; Tue, 27 Feb 2018 14:51:05 +0100 Received: from ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a]) by ICTS-S-EXMBX27.luna.kuleuven.be ([fe80::291a:cc4f:6953:698a%25]) with mapi id 15.00.1320.000; Tue, 27 Feb 2018 14:51:06 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" , "rsgb_lf_group@yahoogroups.co.uk" , "Discussion of the Lowfer (US, European, & UK) and MedFer bands" , 600 / 630 Meter Group <600mrg@w7ekb.com> Thread-Topic: WSJT-X 1.9 v 1.8 second night Thread-Index: AQHTr9D7xorpeEvC0UmGGL7FZ949UqO4Qq9M Date: Tue, 27 Feb 2018 13:51:06 +0000 Message-ID: <1519739465350.69664@kuleuven.be> References: In-Reply-To: Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.112.50.1] MIME-Version: 1.0 X-Spam-Score: 0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Paul, all, very interesting. Is it correct to state that coherent detection will improve (daytime) groundwave reception more that (nightime) skywave and 137kHz more than 475kHz? Is this coherent detection only applied to WSPR or also to JT9 and/or FT8? [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.6 URIBL_SBL Contains an URL's NS IP listed in the Spamhaus SBL blocklist [URIs: n1bug.com] 0.1 URIBL_SBL_A Contains URL's A record listed in the Spamhaus SBL blocklist [URIs: n1bug.com] X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Subject: LF: Re: WSJT-X 1.9 v 1.8 second night Content-Type: text/plain; charset="iso-8859-1" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by klubnl.pl id w1RDu8QM005576 Hello Paul, all, very interesting. Is it correct to state that coherent detection will improve (daytime) groundwave reception more that (nightime) skywave and 137kHz more than 475kHz? Is this coherent detection only applied to WSPR or also to JT9 and/or FT8? 73, Rik ON7YD - OR7T ________________________________________ Van: owner-rsgb_lf_group@blacksheep.org namens N1BUG Verzonden: dinsdag 27 februari 2018 14:39 Aan: rsgb_lf_group@blacksheep.org; rsgb_lf_group@yahoogroups.co.uk; Discussion of the Lowfer (US, European, & UK) and MedFer bands; 600 / 630 Meter Group Onderwerp: LF: WSJT-X 1.9 v 1.8 second night Last night 1.9 continued to have a clear advantage but by a much narrower margin that the first night. In 12 hours ending 1100z: LF 178 decodes with 1.9, 174 with 1.8 MF 890 decodes wtih 1.9, 838 with 1.8 Maybe propagation is the reason? Joe Taylor offered this information regarding the new WSPR decoder: ... You may be interested to know a bit more about how this enhancement works -- and why it's so effective at LF and MF but provides little or no advantage at HF. All of the JT modes use continuous-phase frequency-shift keying (CPFSK), but with the exception of MSK144 the software demoduators estimate soft-symbol values independently for each symbol interval. In other words, we generally do not take advantage of the phase continuity that should exist across symbol boundaries. The new WSPR demodulator treats received data coherently in blocks up to 3 symbols long. If the radio channel is stable enough, we find the resulting WSPR sensitivity threshold is approximately -31.5 dB. The scheme provides no benefit at HF because even a block size of two symbols (about 1.4 s) generally exceeds the coherence time of the HF channel. ... My parallel 1.9 vs 1.8 test will continue on both LF and MF. 73, Paul N1BUG