X-GM-THRID: 1202346952660908349 X-Gmail-Labels: rsgb lf X-Gmail-Received: 6e73fd93c83d2ae1da62fc5c274c31a2561f32c1 Delivered-To: daveyxm@gmail.com Received: by 10.54.72.15 with SMTP id u15cs2886wra; Wed, 3 May 2006 13:59:56 -0700 (PDT) Received: by 10.49.15.20 with SMTP id s20mr80012nfi; Wed, 03 May 2006 13:59:55 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id g1si114499nfe.2006.05.03.13.59.54; Wed, 03 May 2006 13:59:55 -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 1FbOMW-0003Cl-Vd for rs_out_1@blacksheep.org; Wed, 03 May 2006 21:54:20 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1FbOMW-0003Cc-H0 for rsgb_lf_group@blacksheep.org; Wed, 03 May 2006 21:54:20 +0100 Received: from defout.telus.net ([199.185.220.240] helo=priv-edtnes90.telusplanet.net) by relay1.thorcom.net with esmtp (Exim 4.51) id 1FbQEJ-0001Rt-92 for rsgb_lf_group@blacksheep.org; Wed, 03 May 2006 23:54:16 +0100 Received: from priv-edtnaa05.telusplanet.net ([64.180.173.28]) by priv-edtnes90.telusplanet.net (InterMail vM.6.01.05.04 201-2131-123-105-20051025) with ESMTP id <20060503205357.UAGE4267.priv-edtnes90.telusplanet.net@priv-edtnaa05.telusplanet.net> for ; Wed, 3 May 2006 14:53:57 -0600 Received: from [192.168.1.1] (d64-180-173-28.bchsia.telus.net [64.180.173.28]) by priv-edtnaa05.telusplanet.net (BorderWare MXtreme Infinity Mail Firewall) with ESMTP id 21LPCTPASW for ; Wed, 3 May 2006 14:53:56 -0600 (MDT) Message-ID: <44591862.1030808@telus.net> Date: Wed, 03 May 2006 13:53:54 -0700 From: Scott Tilley User-Agent: Thunderbird 1.5.0.2 (Windows/20060308) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <000701c66e90$c21a7e60$01e8fc3e@g3kev> In-Reply-To: <000701c66e90$c21a7e60$01e8fc3e@g3kev> X-Spam-Score: -0.7 (/) X-Spam-Report: autolearn=disabled,AWL=-1.216,FORGED_RCVD_HELO=0.05,FROM_ENDS_IN_NUMS=0.516 Subject: Re: LF: Wilkinson Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 5473 Mal The resistor is there to deal with an unbalanced situation only. If everything is 'OK' then no current flows in the resistor. Don't be two weirded out by this circuit as it widely used on HF, VHF and UHF to combine antennas. On these bands one uses coax to make the 1/4 wave sections and the resistor is often omitted. 73 Scott hamilton mal wrote: > Hi All > Looking at the cct of the Wilkinson combiner there is a large 100 ohm > Resistor involved. How efficient is this type of coupler and how much RF > does the resistor eat up.What is the loss through the device? > Those using the coupler will know the answer, and how were the values > calculated for LF applications. > > 73 de Mal/G3KEV > > > > >