Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v4M9Jx7n026131 for ; Mon, 22 May 2017 11:20:01 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dCjML-0006SC-PJ for rs_out_1@blacksheep.org; Mon, 22 May 2017 10:10:37 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dCjML-0006S3-03 for rsgb_lf_group@blacksheep.org; Mon, 22 May 2017 10:10:37 +0100 Received: from mail-wm0-x22a.google.com ([2a00:1450:400c:c09::22a]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dCjMI-0005Kp-4b for rsgb_lf_group@blacksheep.org; Mon, 22 May 2017 10:10:35 +0100 Received: by mail-wm0-x22a.google.com with SMTP id d127so144426557wmf.0 for ; Mon, 22 May 2017 02:10:33 -0700 (PDT) X-DKIM-Result: Domain=gmail.com Result=Good and Known Domain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:date:message-id:to:subject:in-reply-to:references:mime-version :content-transfer-encoding; bh=APQBRb1a2s2JhnD8Z+XMEccgDb+De4phAefJV+K8OPI=; b=Lq/WShE3fakpYx5xUd4681Xw3Ql414XKNKs1idt1Pr8HllogupM6yQtEn1FXLriEvP P4ZZwPQq/TPv1ytUf7VgFnVLLr8D/vfJtD+B0q27GKyfpDRkU8Jxqo6ZUu85eJgPxcVC v/5Elrhkhv6YjMCRKeQvKj4wwrk+swRlXpHcgFLlrHtPYHY4oP79dsv9zwBPCsoqg2lK HKUJjRslDnwIOHma6jlMyO4ZrS/MW5qrIz2j5WY8IdUMexXGULOVButX8Sd5iG72T+MT DT4PFThm5u/p/m+oeCtlb++q3UAcOVwIzSDsDEpLMaDanjmR5yf8osw4cuBTQ6pj4tgg BTxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:date:message-id:to:subject:in-reply-to :references:mime-version:content-transfer-encoding; bh=APQBRb1a2s2JhnD8Z+XMEccgDb+De4phAefJV+K8OPI=; b=QfI4QsPU288YFrgRNS8PURUJ8NlFE/gQdupzB0ss8uYK9/vhA1O/OY7onoK/GkRm+E yloM5aL9iN56l1frLWpnlTnleWg8kwwHo5S3cSxcR1fJk18xlHOEJIlh9Yq9FXHDaQSX Tgn23w5qs4bd+EP8aVObOdvDVFh+ECfUvIwK+g7WTvklXtFiF5pCHemyOeJB3PEabBoa az53iH2iZss4syQlwamPFuXnohlSFY/TFn/Deypw9FrmrYTkbeNapoKVxMvmq3Wp21aH qF1YYW4WMabrSEQH451KD5cx8ChDP6bU/Ls6fdqV24u4Ol0geZDwi+xtOCu0qgRGYaWi k6xQ== X-Gm-Message-State: AODbwcD1nA35TrUDHJ59a5je1uJmyZ6mRw1/cNkTXAHqFNgc3ydBUSfU r1TCBbwlWwfLX92C X-Received: by 10.223.165.94 with SMTP id j30mr12220952wrb.111.1495444230779; Mon, 22 May 2017 02:10:30 -0700 (PDT) Received: from OfficeWin7.lan (82-70-254-222.dsl.in-addr.zen.co.uk. [82.70.254.222]) by smtp.gmail.com with ESMTPSA id 17sm34908450wmn.7.2017.05.22.02.10.29 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 22 May 2017 02:10:30 -0700 (PDT) From: Chris Wilson X-Google-Original-From: Chris Wilson Date: Mon, 22 May 2017 10:10:28 +0100 X-Priority: 3 (Normal) Message-ID: <256200672.20170522101028@gmail.com> To: Clemens Paul In-Reply-To: <7F853E8736134DDDB2E616EF0826BECE@Clemens0811> References: <15c11b55a0f.marcocadeddu@tin.it> <7F853E8736134DDDB2E616EF0826BECE@Clemens0811> MIME-Version: 1.0 X-Scan-Signature: 3b8620872b19e25fb6f4dfaf1256edc3 Subject: Re: LF: RE: Combining LF amps revisited Content-Type: text/plain; charset=us-ascii 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 2.75 Status: RO X-Status: X-Keywords: X-UID: 11720 Hello Clemens, Thanks for the corrections, I did struggle a bit to get sensible results, but put it down to user error :) No worries! I have built a new combiner transformer on 3 off 78 material stacked 2.4 inch OD toroids, using 3 times the number of turns. It runs a LOT cooler even with no fan. I have now ordered some pot cores, but had to go to Mouser for the size / material I want to try. My e-mail says they should land today. I want to try an auto transformer in the combiner next. Comments welcome! Sunday, May 21, 2017, 8:51:52 AM, you wrote: > Hi Marco & Chris > apologies for the delayed reply. > There was indeed a typo. > It should heave read 12.5Ohm because the amp is designed to work into > a 50:4=12.5 Ohm load. > Then there was another wrong entry:2000W instead of 1000 W as each 1kW amp has its > own 1:4 transformer. > And there is another problem which I have detected meanwhile: > The program calculates only for 50Ohm primary Z not e.g. 12.5Ohm. > One could circumvent this shortcoming by entering 250W instead of 1kW for calculating the > correct flux density because 250W generate the same voltage over the primary winding at > 50 Ohm as 1000W at 12.5Ohm.But then the other parameters are calculcated incorrectly. > Maybe I'll contact the author if he can implement some > changes/improvements in his tool. > 73 > Clemens > DL4RAJ -- Best regards, Chris mailto:dead_fets@gmail.com