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 v5OGan1f030262 for ; Sat, 24 Jun 2017 18:36:50 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dOnz4-0006ni-IH for rs_out_1@blacksheep.org; Sat, 24 Jun 2017 17:32:30 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dOnyn-0006nZ-FA for rsgb_lf_group@blacksheep.org; Sat, 24 Jun 2017 17:32:13 +0100 Received: from mail-wr0-x236.google.com ([2a00:1450:400c:c0c::236]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1dOnyk-0002sE-DA for rsgb_lf_group@blacksheep.org; Sat, 24 Jun 2017 17:32:11 +0100 Received: by mail-wr0-x236.google.com with SMTP id k67so101296629wrc.2 for ; Sat, 24 Jun 2017 09:32:10 -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:in-reply-to:references:mime-version :content-transfer-encoding; bh=/4Ea8PY+4geYAyRHWFdbhnlZKvCzpGDKW962iuxtgAI=; b=JGWJOa7QLGld/1TKKpBHKNpXxDINW7WCHvE3xXtVcQfdnq3pmKhTMe50OpEKLtatEF rXAxeJjLBS53JYYKznnQCixLj0oGOIhOU0NWByccwfbWUexJrZ6ySlE2ItoR61wCW2Gu BjgSD0fj9w5tzssJVAJkwPixf1Pw8JKt+RjT6OSkz8jSjCUIJlF74cBYdLX/pM92sbE3 4XiAWVCFQ1CY6H/YSg8wV19yI1r20MU6r3zU/DTLnwJN5Dho6fdN9xIwaoq0yXOl4y7d Z/OvlUTFhyxl3I4BtT/wuO8U6fCmdo+rSk124DAIgO0XKmrq0J8/qOaOioLj2xd4gU1a QswQ== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=/4Ea8PY+4geYAyRHWFdbhnlZKvCzpGDKW962iuxtgAI=; b=Om9AKwkKNjo7uZQz6PsOTxsPYCKRNIm/21FQZnjd5OioEHMNFyj28W331rWJOyDAcU OhEdAANEVv2XaaDLfKgI+AUoziji64al1SrPwYGxFsh4LHJJZnrj2s0vtLQWTCtDkbhq 6JxXWJscpr5sSxzOaEhJOk/qdeYVi1aFad7aktss+zHETCcR/wMFKDZSX8BYTDfHQIFI 7ro3125f00DJVts8JVBvHiRpl6MlccgvWFQpVRIPuVXWuMTNJycPqLBQ/pt7ciIo1qxH qcc5uFCDtcyYcT27OzEmB+lC4j9oDTqYpNueXprbcq6z4cxT+0AzDUxLFf2e5M2IzbHb 178A== X-Gm-Message-State: AKS2vOzsYJyK4m7EyXNkvdCtpC2MkMqTKMBY1v2TzBDI+u1BYecR8FGu 111WoeYEkrlG5v8+ X-Received: by 10.28.153.213 with SMTP id b204mr8374757wme.96.1498321929275; Sat, 24 Jun 2017 09:32:09 -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 2sm4143329wrn.24.2017.06.24.09.32.08 for (version=TLS1 cipher=AES128-SHA bits=128/128); Sat, 24 Jun 2017 09:32:08 -0700 (PDT) Date: Sat, 24 Jun 2017 17:32:07 +0100 From: Chris Wilson X-Priority: 3 (Normal) Message-ID: <408186507.20170624173207@gmail.com> To: Clemens Paul In-Reply-To: References: <94719482.20170623130346@gmail.com> MIME-Version: 1.0 X-Scan-Signature: 046f068074e745d5c60ca47deee9b503 Subject: Re: LF: RE: 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: RO X-Status: X-Keywords: X-UID: 12089 Hello Clemens, Saturday, June 24, 2017, 11:34:18 AM, you wrote: > Hi Chris, >>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? > This would be possible but more or less lossy. > What is the impedance as seen by your AIM when you measure on the > secondary side of the 1:1 isolation transformer > with antenna and feeder connected to the primary winding? > How long is the coax between the isolation- and the auto-transformer? > With these data it is easy to predict the losses quite accurately. > 73 > Clemens > DL4RAJ I'll do some testing tomorrow, been trying to gain a bit of vertical height today and have run out of "play time". Just to be sure, you want me to reverse the connections so the AIM is looking at the winding that would normally go to the loading coil, and the loading coil and antenna is connected to the winding that would normally go, via about 50 feet of co-ax, to the auto transformer in the shack bound combiner? Thanks for your help! -- Best regards, Chris mailto:dead.fets@gmail.com