Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk02.r1000.mx.aol.com (Internet Inbound) with ESMTP id D4C173800009A; Mon, 26 Mar 2012 13:46:48 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1SCDyk-0000TU-2u for rs_out_1@blacksheep.org; Mon, 26 Mar 2012 18:45:14 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1SCDyj-0000TL-Dl for rsgb_lf_group@blacksheep.org; Mon, 26 Mar 2012 18:45:13 +0100 Received: from cpsmtpb-ews05.kpnxchange.com ([213.75.39.8]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1SCDyi-0001MN-8e for rsgb_lf_group@blacksheep.org; Mon, 26 Mar 2012 18:45:13 +0100 Received: from cpsps-ews14.kpnxchange.com ([10.94.84.181]) by cpsmtpb-ews05.kpnxchange.com with Microsoft SMTPSVC(6.0.3790.4675); Mon, 26 Mar 2012 19:45:06 +0200 Received: from CPSMTPM-CMT104.kpnxchange.com ([195.121.3.20]) by cpsps-ews14.kpnxchange.com with Microsoft SMTPSVC(7.5.7601.17514); Mon, 26 Mar 2012 19:45:06 +0200 Received: from [192.168.2.13] ([62.131.23.134]) by CPSMTPM-CMT104.kpnxchange.com with Microsoft SMTPSVC(7.0.6002.18264); Mon, 26 Mar 2012 19:45:06 +0200 Message-ID: <4F70AB22.3030600@kpnmail.nl> Date: Mon, 26 Mar 2012 19:45:06 +0200 From: pa3abk User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:11.0) Gecko/20120312 Thunderbird/11.0 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <1FFFC71EA0BE4176BEFFBF7D095D3BA9@Extensa> <4106A79FDAE74690B0A2C710BDA51B55@Extensa> In-Reply-To: X-OriginalArrivalTime: 26 Mar 2012 17:45:06.0549 (UTC) FILETIME=[2E5DC250:01CD0B78] X-RcptDomain: blacksheep.org X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz ! Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:443763456:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4064f70ab8861c3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Peter, It's a known problem also here. There are several ways to prevent that noise slip into the DC feederlines. Assume that every situation will be different for each of us, depending the source of the interferrence. Dallas Lankford wrote a small article about this in the past. Maybe it has some idea's to get things under control at your end. http://antenadx.com.br/PDF/Antenas%20ativas/LowNoiseActiveAntennasAC-DCPowerSuppliesII.pdf Dallas is more focussed on MW, but some of his articles are useable on LF. Initally those files were stored on kongsfjord.no but for some reason they moved to "somewhere" in the Yahoo groups. Which explains the strange internet location: somewhere in Brazil. It was the best my friend Google could provide at the moment. Jan/pa3abk On 26-3-2012 7:40, PA1SDB, Peter wrote: > Hello Roelof, VLF, LF, but also HF, VHF, UHF and SHF :-) > Today I will try to ad some stabilyzers, filters, C's and Choces at > the powers supply Mini Whip input. > > That single 9 volt battery block was empty after 12 hours. > It did drop from 9.4 to 7.3 in 12 h. > A bit expensive to buy 2x 9v batery's a day :-) > > 73's Peter, PA1SDB > > http://www.qsl.net/pa1sdb/ > > > -- pa3abk<-> dordrecht jo21it