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: dcc1: mailn 1182; Body=3 Fuz1=3 Fuz2=3 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 v5NC98CZ023010 for ; Fri, 23 Jun 2017 14:09:09 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dONJa-000216-SR for rs_out_1@blacksheep.org; Fri, 23 Jun 2017 13:03:54 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dONJY-00020x-3m for rsgb_lf_group@blacksheep.org; Fri, 23 Jun 2017 13:03:52 +0100 Received: from mail-wr0-x22b.google.com ([2a00:1450:400c:c0c::22b]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dONJV-0006nF-7R for rsgb_lf_group@blacksheep.org; Fri, 23 Jun 2017 13:03:50 +0100 Received: by mail-wr0-x22b.google.com with SMTP id r103so62960013wrb.0 for ; Fri, 23 Jun 2017 05:03:48 -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=date:from:message-id:to:subject:mime-version :content-transfer-encoding; bh=1jYqWHihGIIjNlVRCF/F+/cj/UmZpiXKQpCLyeiXDHc=; b=hvVZvefPTi9H23jE3GQguQK5WJ4R38NU//OPCi+pasuesr2ifIeOdNl6DXTBYKGNgZ tJ0tM1eCYg1m3upLD4uuaYewJ87onBs4CUqvWQCJHjstmAsTi/BExHmXe5soRl0hOXx9 E2Gd2yWEuC1dabfLePZWcgKp//g4ck9SqXwUb1V3jrZFe3uO78HQ7DLiyq/asHAcb7zM n01XFJGuWS/rG26VLMubyqYZinji5JgH+lJLawS4CDbJ8/JKc2zYHu71ziAX285kKC2G dogtc01oT9X1wLMwSnWDq7OvjBnz9ykEVVKAKjxMpJDa5FcU1+4AzEchsMFdz7az4zn1 kOXA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:message-id:to:subject:mime-version :content-transfer-encoding; bh=1jYqWHihGIIjNlVRCF/F+/cj/UmZpiXKQpCLyeiXDHc=; b=qaDRZnpjC2PNEUv5UNQhWhxJhMn4HDXv/zjoztfSIopzgVBJigRB841reytc2D01y5 eh8ZA5hHPGDSqa6pCOfllm4tfXt/LkAA2SK+qKmo5jmsJtEQg71f4xjiM6QGvnKOh8hZ wdJQd1dpcCaelNweztk1TCzjh+aR4w97JXUFfLhG2ynoEd9aOXJetsjGbfYk7YJBgBuH FqPw7qIptJRokWs+rpXSK3OH77f/IB0PS875w//fGGrWi7q7uboQ8Im4vg7vW5kXy1I+ 0Z4Gi4BbpRrAJbeNmosRPqlsBGnwD+wHtltTJQ7X891f7BQRq/lWEcZg7ePx83EA7KGq 9UNg== X-Gm-Message-State: AKS2vOzlQCyw5xXj71CsnjlQZDJgRCalEejkCZYYISaWiQkpLeuKR+p/ 1+7ChQ7+QHXRrejd X-Received: by 10.223.141.146 with SMTP id o18mr5383775wrb.110.1498219428105; Fri, 23 Jun 2017 05:03:48 -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 c27sm4730801wrb.44.2017.06.23.05.03.47 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 23 Jun 2017 05:03:47 -0700 (PDT) Date: Fri, 23 Jun 2017 13:03:46 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <94719482.20170623130346@gmail.com> To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: LF: Transformer questions. 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: O X-Status: X-Keywords: X-UID: 12057 Hello LF'ers, Two 500 watt Class D amps combined. The output transformer of the combiner is now an auto transformer. This feeds, via RG-213 to outdoors, where an isolating transformer, that is a conventional primary / secondary transformer with taps for impedance matching then feeds my loading coil and then the antenna. Can I wind the isolating transformer as a 1 : 1 and do impedance matching (which changes with weather / foliage growth) indoors using a tapped combiner auto transformer? I want to change the impedance matching / isolating transformer anyway as it runs a bit hot on long TX sequences. I tried an auto trans former as the impedance matching one outside, but had serious RF into the mains causing various issues, a conventional isolating / impedance transformer fixed all that, so I assume it needs to stay, even as a 1 :1 ? Thanks. -- Best regards, Chris mailto:dead.fets@gmail.com