Return-Path: X-Spam-DCC: paranoid 1290; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,SPF_PASS autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id u589hf0M009714 for ; Wed, 8 Jun 2016 11:43:41 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1bAZwk-0006NU-8L for rs_out_1@blacksheep.org; Wed, 08 Jun 2016 10:38:46 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1bAZwj-0006NL-Q4 for rsgb_lf_group@blacksheep.org; Wed, 08 Jun 2016 10:38:45 +0100 Received: from s16315160.onlinehome-server.info ([87.106.80.234] helo=mail.vigilant.es) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1bAZwg-0004Hz-B1 for rsgb_lf_group@blacksheep.org; Wed, 08 Jun 2016 10:38:44 +0100 Received: from servigilant.vigilant.local ([87.216.178.132]) by vigilant.es with MailEnable ESMTP; Wed, 8 Jun 2016 11:38:20 +0200 Received: from servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931]) by servigilant.vigilant.local ([fe80::3cdf:95f8:c1c9:3931%13]) with mapi id 14.03.0123.003; Wed, 8 Jun 2016 11:38:25 +0200 From: =?iso-8859-1?Q?VIGILANT_Luis_Fern=E1ndez?= To: "rsgb_lf_group@blacksheep.org" Thread-Topic: A first step on the 100 km band Thread-Index: AQHRwWgNkW5zcYD7ME+UXqhDrYvYEp/fTz/Q Date: Wed, 8 Jun 2016 09:38:24 +0000 Message-ID: <579355A36AEE9D4FA555C45D556003AB53C3051E@servigilant.vigilant.local> In-Reply-To: <5757E24F.1050507@posteo.de> Accept-Language: es-ES, en-US Content-Language: es-ES X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.2] MIME-Version: 1.0 X-Scan-Signature: 3b8620872b19e25fb6f4dfaf1256edc3 Subject: LF: RE: A first step on the 100 km band Content-Type: text/plain; charset="iso-8859-1" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.11 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id u589hf0M009714 Status: O X-Status: X-Keywords: X-UID: 8240 Big WOOOwww Stefan !!! :-O Real fuel for thoughts. My biggest congratulations Stefan :-) http://www.nasa.gov/mp3/590331main_ringtone_smallStep.mp3 73 de Luis EA5DOM -----Mensaje original----- De: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] En nombre de DK7FC Enviado el: miércoles, 08 de junio de 2016 11:16 Para: rsgb_lf_group@blacksheep.org Asunto: ULF: A first step on the 100 km band Hi all, I've got a first result with my ULF project: One of the ideas to generate and radiate a signal on the 100 km band to use a ferrite power transformer with using two E cores out of N27 material. These are available at https://www.buerklin.com/de/e-kern/p/83d970 At 2970 Hz i can apply 1 V / turn without saturating the core, maybe even more. I think i can generate 3 kV (rms) with one transformer without a risk of a flashover. And i can set an air gap between the two E cores. For 2970 Hz i need L = 6.1 H! Now without an air gap i need about 800 turns (hand wound!)to resonate the antenna. So i can apply 800 V now. On 2970 Hz, my antenna radiation resistance is 70 uOhm. With 800V on the wire it radiates 6 nW! The distance to my remote site is 3.5 km or 0.035 lambda. I'm TXing since last night and got a trace of up to 15 dB SNR in 424 uHz. Quite weak but it's a first step. The signal was radiated with an E field antenna and received with a H field antenna, so there could be a better result in the near field. I' now planning to wind more turns on the transformer and add an air gap to keep the inductance and rise the voltage limit. 73, Stefan