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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO,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 u2C7tpDm010489 for ; Sat, 12 Mar 2016 08:55:51 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1aeeHp-00065X-Vp for rs_out_1@blacksheep.org; Sat, 12 Mar 2016 07:48:33 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1aeeHo-00065O-UU for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2016 07:48:32 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1aeeHm-0006OZ-OE for rsgb_lf_group@blacksheep.org; Sat, 12 Mar 2016 07:48:31 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 29A6E327401 for ; Sat, 12 Mar 2016 07:48:26 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 0985628A0135 for ; Sat, 12 Mar 2016 07:48:29 +0000 (UTC) Message-ID: <56E3C9CC.1030704@abelian.org> Date: Sat, 12 Mar 2016 07:48:28 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <56DEAE40.8000809@tiscali.co.uk> <56DEF9AE.7060203@posteo.de> <56E1F553.1080306@abelian.org> <56E1FC61.8090400@posteo.de> <56E34476.4060707@gmx.net> In-Reply-To: <56E34476.4060707@gmx.net> X-Scan-Signature: 0a4643e586472c13187d293ec5d096c2 Subject: Re: LF: EbNaut from Todmorden Content-Type: text/plain; charset=ISO-8859-1; 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: 7305 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 --