X-GM-THRID: 1202346952660908349 X-Gmail-Labels: rsgb lf X-Gmail-Received: fa6fb3a70ba6e3288205a3aab73f106092229702 Delivered-To: daveyxm@gmail.com Received: by 10.54.72.15 with SMTP id u15cs4932wra; Wed, 3 May 2006 15:07:03 -0700 (PDT) Received: by 10.48.216.15 with SMTP id o15mr138532nfg; Wed, 03 May 2006 15:07:03 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id l32si962897nfa.2006.05.03.15.07.01; Wed, 03 May 2006 15:07:03 -0700 (PDT) Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1FbPSv-0003eh-CV for rs_out_1@blacksheep.org; Wed, 03 May 2006 23:05:01 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FbPSu-0003eY-Tj for rsgb_lf_group@blacksheep.org; Wed, 03 May 2006 23:05:00 +0100 Received: from smtp802.mail.ukl.yahoo.com ([217.12.12.139]) by relay1.thorcom.net with smtp (Exim 4.51) id 1FbRKg-0001wL-FX for rsgb_lf_group@blacksheep.org; Thu, 04 May 2006 01:04:57 +0100 Received: (qmail 54923 invoked from network); 3 May 2006 22:04:36 -0000 Received: from unknown (HELO lark) (alan.melia@btinternet.com@213.122.9.110 with login) by smtp802.mail.ukl.yahoo.com with SMTP; 3 May 2006 22:04:35 -0000 Message-ID: <001d01c66efd$99041280$67b0fea9@lark> From: "Alan Melia" To: References: <000701c66e90$c21a7e60$01e8fc3e@g3kev> <445918F4.8070304@telus.net> Date: Wed, 3 May 2006 22:59:57 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 X-Spam-Score: -1.0 (-) X-Spam-Report: autolearn=disabled,AWL=-1.039 Subject: Re: LF: Wilkinson Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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 Status: O X-Status: X-Keywords: X-UID: 5471 The resistor absorbs no power, if the two modules are providing equal power and are IN PHASE. Be careful of this last one, particularly with p-p stages, as there are some splitter-combiners that operate differently (180 degrees, or quadrature at microwaves). Some alternative wideband ideas culled from professional Marine manuals are on my web pages. Whilst a Wilkinson is usually shown as combining two units, it and these can be configured for any number, even odd ones. The output impedance of the transformer versions is Zin /N , whereas Scott's lumped component design is narrow band and does not need an output transformer when properly designed. (i.e 50 ohm in <>50 ohm out ) It is also a lot easier to make for 136kHz. www.alan.melia.btinternet.co.uk/combiner.htm Cheers de Alan G3NYK