Return-Path: Received: (qmail 27070 invoked from network); 1 Mar 2005 06:51:38 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore03.plus.net with SMTP; 1 Mar 2005 06:51:38 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1D61Fn-000Aj4-V4 for dave@picks.force9.co.uk; Tue, 01 Mar 2005 06:53:14 +0000 Received: from [192.168.67.2] (helo=ptb-mxcore02.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1D61Fn-000Aj1-Ru for dave@picks.force9.co.uk; Tue, 01 Mar 2005 06:53:11 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore02.plus.net with esmtp (Exim) id 1D61EG-000Lzt-5H for dave@picks.force9.co.uk; Tue, 01 Mar 2005 06:51:36 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1D61Dw-0004cZ-L7 for rs_out_1@blacksheep.org; Tue, 01 Mar 2005 06:51:16 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1D61Dw-0004cQ-8B for rsgb_lf_group@blacksheep.org; Tue, 01 Mar 2005 06:51:16 +0000 Received: from defout.telus.net ([199.185.220.240] helo=priv-edtnes46.telusplanet.net) by relay.thorcom.net with esmtp (Exim 4.43) id 1D61Du-0002vf-Gx for rsgb_lf_group@blacksheep.org; Tue, 01 Mar 2005 06:51:16 +0000 Received: from cognizant1 ([154.5.20.191]) by priv-edtnes46.telusplanet.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with SMTP id <20050301065107.ZWBO14438.priv-edtnes46.telusplanet.net@cognizant1>; Mon, 28 Feb 2005 23:51:07 -0700 Message-ID: <003e01c51e2b$0f93d220$0201a8c0@private.network> From: "Scott Tilley" To: lowfer@lwca.org, rsgb_lf_group@blacksheep.org Date: Mon, 28 Feb 2005 22:51:13 -0800 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SPF-Result: relay.thorcom.net: domain of telus.net designates 199.185.220.240 as permitted sender X-Spam-Score: 0.7 (/) X-Spam-Report: autolearn=no,FORGED_RCVD_HELO=0.05,FROM_ENDS_IN_NUMS=0.516,HTML_40_50=0.086,HTML_MESSAGE=0.001 Subject: LF: ... --- ... Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.3 required=5.0 tests=FROM_ENDS_IN_NUMS,HTML_20_30, HTML_MESSAGE 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 X-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit

The smoke test of this Wilkinson Combiner was successfull in that no smoke came out and nothing died. However, we get enough heat to cook an egg on the 100ohm balance resistor.

We have a scope match on the output to the dummy load and it shows about 225W from one transmitter, add another and we get 450W, success NOPE! The transmitters are outputting ~450W each! Therefore, half the power is being absorbed in the 100ohm balance resistor. Examining the phase relationship of the input to the combiner waveforms indicates they are in phase within ~10degrees and almost equal in amplitude. So what gives! Anyone have some idea what may be going wrong? Of course we have checked and doubled checked the circuit for errors and nothing... All seems as it should according to formulas and drawings we have viewed and designed it from.

Does anyone have an idea how we could troubleshoot our way through this?

Any advice would be appreciated.

73 Scott and Steve(It's all his fault ;-)

Check the status of radio beacon 'TIL' in CN89lg at:
www.scottboxx.com/radio