Return-Path: X-Spam-DCC: paranoid 1233; 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=-0.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, PLING_QUERY,RATWARE_GECKO_BUILD,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 u3EL5C8X020909 for ; Thu, 14 Apr 2016 23:05:13 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aqoOc-0006zo-Hh for rs_out_1@blacksheep.org; Thu, 14 Apr 2016 22:01:50 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aqoOc-0006zf-8T for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2016 22:01:50 +0100 Received: from mout01.posteo.de ([185.67.36.65]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1aqoOa-0004H2-L9 for rsgb_lf_group@blacksheep.org; Thu, 14 Apr 2016 22:01:49 +0100 Received: from dovecot03.posteo.de (dovecot03.posteo.de [172.16.0.13]) by mout01.posteo.de (Postfix) with ESMTPS id 8861520426 for ; Thu, 14 Apr 2016 23:01:45 +0200 (CEST) Received: from mail.posteo.de (localhost [127.0.0.1]) by dovecot03.posteo.de (Postfix) with ESMTPSA id 3qmClY35jQz5vNK for ; Thu, 14 Apr 2016 23:01:45 +0200 (CEST) Message-ID: <57100539.4090905@posteo.de> Date: Thu, 14 Apr 2016 23:01:45 +0200 From: DK7FC User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <8D363D5D172D923-15A0-65ABC1@webmail-vd012.sysops.aol.com> <570EAFD1.8@posteo.de> <570EBA18.7050409@abelian.org> In-Reply-To: <570EBA18.7050409@abelian.org> X-Scan-Signature: e6de17d69e46ff4ea8db042ef2cd7e46 Subject: Re: LF: TXing on VLF again, A fan in series to the antenna?! :-) Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 Status: O X-Status: X-Keywords: X-UID: 7718 Hi VLF, Since 22:45 i'm running 200 mA on 8270.0050 Hz into my antenna again. 200 mA is the limitation of this compact yoghurt-coil. The overall system loss is about 1 kOhm, so i just need 40W to run the system at 100%. Or, in other words, power is not the limiting factor :-) There are holes into the single yoghurt cups so there can be an air flow in the cups. And this will be helpful/necessary in summer / daytime. 200 mA is about the current consumption of a 12V fan used in PC power supplies. So i've constructed a plate with a fan mounted on that, improvong the air flow. Later, a tube must be used to form a curve on the top of the arrangement to prevent water from flowing between the coils. Then, a forced air flow becomes necessary, normal thermal convection could be to small. https://dl.dropboxusercontent.com/u/19882028/VLF/20160414_214939.jpg https://dl.dropboxusercontent.com/u/19882028/VLF/20160414_215835.jpg A normal bridge rectifier with UF4007 diodes, then 2 ZD15 Z-diodes, a single UF4007 diode (to reduce the voltage a bit) and a 100nF C, that's all. It works very well and automatically :-) 73, Stefan Am 13.04.2016 23:28, schrieb Paul Nicholson: > > Sorry Stefan, nothing showing for 20:14,+30m in > 555uHz. The noise floor there is 0.2 fT probably > due to all the thunderstorms in Europe tonight. > I expect your signal is down below 0.1 fT. > > Also checked 20:14,+60m in 278 uHz in case you ran > for a full hour, but nothing. > > Let's try again when the background is lower. > > -- > Paul Nicholson > -- >