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 x01M6tmg015180 for ; Tue, 1 Jan 2019 23:06:57 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1geS4o-0002S9-Cz for rs_out_1@blacksheep.org; Tue, 01 Jan 2019 21:59:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1geS2S-0002Rn-Kz for rsgb_lf_group@blacksheep.org; Tue, 01 Jan 2019 21:57:28 +0000 Received: from rhcavuit04.kulnet.kuleuven.be ([2a02:2c40:0:c0::25:137]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.91_59-0488984) (envelope-from ) id 1geS2P-0006Zv-Tg for rsgb_lf_group@blacksheep.org; Tue, 01 Jan 2019 21:57:27 +0000 X-KULeuven-Envelope-From: rik.strobbe@kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: B6069120009.A5610 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 rhcavuit04.kulnet.kuleuven.be (Postfix) with ESMTP id B6069120009 for ; Tue, 1 Jan 2019 22:57:08 +0100 (CET) Received: from ICTS-S-EXMBX20.luna.kuleuven.be (icts-s-exmbx20.luna.kuleuven.be [10.112.11.55]) (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 A54DD20006; Tue, 1 Jan 2019 22:57:08 +0100 (CET) Received: from ICTS-S-EXMBX27.luna.kuleuven.be (10.112.11.62) by ICTS-S-EXMBX20.luna.kuleuven.be (10.112.11.55) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 1 Jan 2019 22:57:08 +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 15.00.1395.000; Tue, 1 Jan 2019 22:57:08 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" , "rsgb-lf-group@groups.io" , "Discussion of the Lowfer (US, European, & UK) and MedFer bands" , "600MRG@mailman.qth.net" <600MRG@mailman.qth.net> Thread-Topic: [rsgb-lf-group] Bad news / help request Thread-Index: AQHUoSEXE4O1XUQZVEGi4WJjbOVOpqWa9QTb Date: Tue, 1 Jan 2019 21:57:08 +0000 Message-ID: <1546379826299.51959@kuleuven.be> References: <837ccf97-5020-0ed3-b67e-966df3020851@n1bug.com>, 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: -2.3 (--) 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 @@CONTACT_ADDRESS@@ for details. Content preview: Hello Paul, in the current SlowJT9 version double and quadruple tone spacing can be selected. If it is of any help I can allow any value for increased tone spacing. The practical limit will be the TX bandwidth. B [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [2a02:2c40:0:c0:0:0:25:137 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record X-Scan-Signature: 0b36c952c26be93e626fe2fa1c93657f Subject: LF: Re: [rsgb-lf-group] Bad news / help request 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 x01M6tmg015180 Hello Paul, in the current SlowJT9 version double and quadruple tone spacing can be selected. If it is of any help I can allow any value for increased tone spacing. The practical limit will be the TX bandwidth. But for JT9-5 the signal bandwidth is only 2.6Hz, so anything up to 1000 should fit within the TX bandwidth. 73, Rik ON7YD - OR7T ________________________________________ Van: rsgb-lf-group@groups.io namens N1BUG Verzonden: maandag 31 december 2018 16:54 Aan: rsgb_lf_group@blacksheep.org; rsgb-lf-group@groups.io; Discussion of the Lowfer (US, European, & UK) and MedFer bands; 600MRG@mailman.qth.net Onderwerp: Re: [rsgb-lf-group] Bad news / help request Duh! Scratch item 3. Of course that won't work as it will destroy the JT9 tone spacing!! Paul On 12/31/18 8:59 AM, N1BUG wrote: > So, the latest SlowJT9 test is completed. I regret I was not able to > run one night on 630m as planned. > > I used a QRP Labs Ultimate 3S beacon transmitter for these tests. > Yesterday I checked my ability to use JT9-5 for QSOs and found that > I have none! My FT-2000 transceiver has too much drift to be of any > use on JT9-5 and is very marginal even for JT9-2. What a huge > disappointment, though it did not come as any surprise. > > I can think of several ways to solve this but am not sure any of > them can save some part of this winter season: > > 1. Add insulation and a heater to the FT-2000 TCXO area. I will try > this but I am not convinced I can make enough improvement. The drift > is really ugly! > > 2. Replace the FT-2000 TCXO with an outboard programmable GPS > referenced oscillator, for example a Leo Bodnar unit. The trouble > with this is I do not have sufficient knowledge or experience to > know what kind of problems might be encountered. The GPSDO is enough > of an investment to kill any and all other attempts at a resolution > if I am unable to make it work. > > 3. Use a divide-by-100 circuit with the FT-2000 operating at 13.6 > MHz instead of a LO/mixer converter from 10 MHz. This should reduce > drift to the order of 0.1 Hz, probably quite acceptable. So far I > have not found a divide-by-100 circuit using a modern/available part. > > 4. Run away from the junk FT-2000 completely, using audio to 136 kHz > converter for Tx and 136 kHz to audio converter for Rx. This is > finally the direction I want to go but there seems to be much > learning left to do and a lot of building. It's probably not a > solution which can be completed in time for this winter season. > > If anyone has experience in any of these areas and is willing to > share knowledge, please get in touch with me. This may be the last > solar minimum for me, and I would like to make some LF/MF DX QSOs > before these incredible conditions fade away. > > 73, > Paul N1BUG -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#8381): https://groups.io/g/rsgb-lf-group/message/8381 Mute This Topic: https://groups.io/mt/28896740/1555778 Group Owner: rsgb-lf-group+owner@groups.io Unsubscribe: https://groups.io/g/rsgb-lf-group/leave/3440736/168031436/xyzzy [rik.strobbe@kuleuven.be] -=-=-=-=-=-=-=-=-=-=-=-