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 w2EI6oxB002324 for ; Wed, 14 Mar 2018 19:06:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ewAig-0004Es-A3 for rs_out_1@blacksheep.org; Wed, 14 Mar 2018 18:01:46 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ewAif-0004Ej-Me for rsgb_lf_group@blacksheep.org; Wed, 14 Mar 2018 18:01:45 +0000 Received: from gmy2-mh805.smtproutes.com ([94.186.192.134]) by relay1.thorcom.net with esmtp (Exim 4.89) (envelope-from ) id 1ewAic-0004zN-Q3 for rsgb_lf_group@blacksheep.org; Wed, 14 Mar 2018 18:01:44 +0000 X-Katharion-ID: 1521050481.19132.gmy2-mh805 Received: from servigilant.vigilant.es ([87.216.178.132]) by gmy2-mh805.smtproutes.com [(94.186.192.134)] with ESMTP via TCP (TLSv1/TLS_DHE_RSA_WITH_AES_256_CBC_SHA); 14 Mar 2018 18:01:21 +0000 Received: from servigilant.vigilant.local ([fe80::c40d:8140:d722:5448]) by servigilant.vigilant.local ([fe80::c40d:8140:d722:5448%13]) with mapi id 14.03.0123.003; Wed, 14 Mar 2018 19:01:19 +0100 From: =?utf-8?B?VklHSUxBTlQgTHVpcyBGZXJuw6FuZGV6?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: RE: LF: LU1DOW soon in MF/LF Thread-Index: AQHTusjKFaegknO1hkywtHuis666OKPQA3hA Date: Wed, 14 Mar 2018 18:01:18 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003ABA3C2F32B@servigilant.vigilant.local> References: <1621f5d38b9.marcocadeddu@tin.it> In-Reply-To: <1621f5d38b9.marcocadeddu@tin.it> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.22] MIME-Version: 1.0 X-Spam-Score: 0.0 (/) 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: Hi All, LF More comments in behalf of Oscar, LU1DOW and his thanks for the interest in his work Rik: Oscar included class B in the PA just for testing some linear modes if there is any future need. It is true that DFCW do not need linear PA [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: RE: RE: LF: LU1DOW soon in MF/LF Content-Type: text/plain; charset="utf-8" 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=TO_ADDRESS_EQ_REAL 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 base64 to 8bit by klubnl.pl id w2EI6oxB002324 Hi All, LF More comments in behalf of Oscar, LU1DOW and his thanks for the interest in his work Rik: Oscar included class B in the PA just for testing some linear modes if there is any future need. It is true that DFCW do not need linear PA Marco: It is not a modified PA. The output was designed as a simple PL circuit, so to resonate it in LF with the coil shown in the pictures it was necessary to add a high capacity in parallel with the plate tunning capacitor. High voltage mica capacitors are used there Stefan: Oscar will be happy to make tests in EbNaut as soon as possible and he is very grateful for your help and good advices 73 de Luis EA5DOM -----Mensaje original----- De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de marcocadeddu@tin.it Enviado el: martes, 13 de marzo de 2018 13:37 Para: rsgb_lf_group@blacksheep.org Asunto: R: RE: LF: LU1DOW soon in MF/LF Hi Luis, Chris and LF, enjoyed the pictures from Oscar.. when I see tubes my heart.. I don't wonder for the filament current (at 5V it means 150W) but how Oscar arranged the PI or PL output matching circuit: I guess he modified an HF PA and it means a lot of L and C to retune from 160m.. Hope to hear soon Oscar on LF/MF. Now I'm testing the new TX for MF it is on since last saturday 24h/24h trasmitting WSPR2 every 10 minutes. I need some fine (at least dry..) weather to tune and match better the antenna because now the return loss is not really wonderful (almost 10 dB..) so I haven't any idea of the ERP but it should be in the range of 200mW. Enjoy MF/LF and lower ;-) 73, Marco IK1HSS ----Messaggio originale---- Da: luis@vigilant.es Data: 13-mar-2018 11.28 A: "rsgb_lf_group@blacksheep.org" Ogg: RE: LF: LU1DOW soon in MF/LF Hi Chris, LF Oscar answered the question. I'll try to translate, but can't promise not to make a mistake in tube terminology :-) He is not using filament choke as this is a direct heating tethrode. So the midpoint of the filament transformer secondary is connected to ground The driving is to the grid with a tuned circuit. It works in C class for QRSS and B Class for DFCW. And YES, this a dangerous high voltage bricolage and a waste of energy. Just the filament is sucking 35.5 Amps :-O Oscar plans to test first single carrier in LF with LU8YD at 1000Km first to check if all is going as in previous tests some time ago. After that he will switch to MF and test again 73 de Luis EA5DOM