Return-Path: X-Spam-DCC: paranoid 1181; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 u2CAF4as010739 for ; Sat, 12 Mar 2016 11:15:04 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aegSe-0006IQ-A4 for rs_out_1@blacksheep.org; Sat, 12 Mar 2016 10:07:52 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aegSc-0006IH-1o for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2016 10:07:50 +0000 Received: from mout.gmx.net ([212.227.15.19]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1aegSa-0006hr-0I for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2016 10:07:48 +0000 Received: from Clemens0811 ([79.237.172.111]) by mail.gmx.com (mrgmx003) with ESMTPSA (Nemesis) id 0Lkx9B-1a6BBn0tRV-00ajIE for ; Sat, 12 Mar 2016 11:07:46 +0100 From: "Clemens Paul" To: References: <56DEAE40.8000809@tiscali.co.uk> <56DEF9AE.7060203@posteo.de> <56E1F553.1080306@abelian.org> <56E1FC61.8090400@posteo.de> <56E34476.4060707@gmx.net> <56E3C9CC.1030704@abelian.org> In-Reply-To: <56E3C9CC.1030704@abelian.org> Date: Sat, 12 Mar 2016 11:07:44 +0100 Message-ID: MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 Thread-Index: AdF8M9IRB0RVZYEuTNG3YyPN4kLmSAAEW7Ww X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 X-Provags-ID: V03:K0:Lytg+tyjeCzGy54K6ZhWJkOyPSg5diAhsSwTQOEA3ZrlERwYem2 TC5jZbk5OVCN5CtObl6gl3P1jfhhVNML077eyC1LieMtsJsECHjYlwdE+vVB6yzLjEgv5nZ +TYqmYLuSOIpgRXcXHsya7wbd8Xy/jD3rRogX1WrsaQRI2UoTg7aoja+EW0Lc8X83PeDXi9 c7Mt68iZ4SBAibeUyh74w== X-UI-Out-Filterresults: notjunk:1;V01:K0:Wk6Z4zONKLM=:T1/NIZ7Hk40YSLAKkz0lz7 Y8XiS20hgxCwxL86rcLxyAThLe3bi8fdh8VtfIqwvAQZX7wuZqHVwK1SnhLA/mx9botQdxAhU M7/20UMm51ggPUmjELIFpd7dhO0GnqXFB7SFyp2NGMsahwKaRtVjDWvudSS9/0Cr0hQPsJepe 6oloKqvgQTR4dcqaka3a62hrTJWQPpKnXu0gn0nDtugtSZH3WwuGfMTmzas455JG+BhRxxWGj 53RpqqgwkQrJGu7HD2bbujQLwEMi8GWcony77pUf9yGhlDlblplGmHyLBhqSkNjUWt1lRXWjO JqwS4eU6vJzKBNQE0gJDC7UNHuTg8Lfb8HeCbuWSPuAYoudfSwBsvDgqkft4Xtp8jvsPGHhpb LVGYMELPwKA2kCby2/CBhB6PEqDw2/WrgGhDjIpX40XB3fbslg0Fz9xsAsPgp7FOWFmKeZVa6 v/LoxCFhfnnETt0FKByDojDbeRkUSHCnBlZfh0ElZZeqQ5mpmR/9q8Hp4g9ikiCIqT4Oib8oF gcMJptRTporXvw594DaHUI5DNDGmE9On0kYsfpb9IvQ9L8SiYmwMT/VjPMQOuJStaF12b7W3p nNMl0Mvcz1Yt2pXTip0UlPT43wq297TEppgvIeFefUMWjYpPiOCoIt8FqxJ+rqgLsT5JLGjjv vvj3bNS+3rL5WH5VmLcAo9XLYzREr6Rc5+RROeZCdWR+0Y6MlZcF9a//7yPUtVSTKXjb4zjCG X6/NH1Sl90ttrf4cmDtBkBpqi4xu5ED1YT1J35icl/OoMONTSQpIy+LS1XUk9K1f0z51vHoGL 0huOUag X-Scan-Signature: 1c38f63d01970a2bf149f660c9cb2a37 Subject: RE: LF: EbNaut from Todmorden 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 u2CAF4as010739 Status: O X-Status: X-Keywords: X-UID: 7306 Hi Paul, Mix #2 (µi=10) is certainly the right choice for a LPF as Stefan and Tobias have pointed out. I use it too for my MW PA. The manufacturer on http://www.id-elektronik.de/en/index.htm => click on MW-Components uses for his LPFs #6 (yellow) Mix iron powder which has an even lower permeability, i.e. µi=8. 73 Clemens DL4RAJ >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson >Sent: Saturday, March 12, 2016 8:48 AM >To: rsgb_lf_group@blacksheep.org >Subject: Re: LF: EbNaut from Todmorden > >Thanks Tobias and Stefan! > >I ordered a few T130-2 and a couple of T200-2, should arrive >in time for next weekend. > >Meanwhile, I rebuilt the filter using air cored coils and >it works great. A lovely 200W sine wave into the dummy load >and nothing gets hot! After a while the output transformer >is just slightly warm. DC in was 240W from a 60V supply and >it seems I don't need a cooling fan anywhere. > >I turned the supply down to 10V and put a few volts of RF onto >the antenna (untuned) and got a bright line on Gary Taylor's >grabber - I was expecting a faint line! > >A better RF ground is needed, there's some RF current going >to earth via the domestic ground which I'm not keen on. >So I'll put another transformer at the far end of the coax and >match the antenna/ground to its secondary. I've run out of >toroid cores so it'll be lots of wire wound round a bucket. > >That's the plan for today anyway, while the weather is good. >Maybe some transmission tonight if there's no VLF activity. > >-- >Paul Nicholson >-- >