Return-Path: Received: (qmail 98308 invoked from network); 2 Mar 2005 18:14:41 -0000 Received: from unknown (HELO ptb-spamcore01.plus.net) (192.168.71.1) by ptb-mailstore03.plus.net with SMTP; 2 Mar 2005 18:14:41 -0000 Received: from mailnull by ptb-spamcore01.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1D6YOa-000NCs-56 for dave@picks.force9.co.uk; Wed, 02 Mar 2005 18:16:29 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore01.plus.net with esmtp (Exim 4.32; FreeBSD) id 1D6YOY-000N6v-Q2 for dave@picks.force9.co.uk; Wed, 02 Mar 2005 18:16:26 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1D6YMV-000325-A8 for dave@picks.force9.co.uk; Wed, 02 Mar 2005 18:14:19 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1D6YJc-0000pl-Ga for rs_out_1@blacksheep.org; Wed, 02 Mar 2005 18:11:20 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1D6YJW-0000mu-J1 for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2005 18:11:14 +0000 Received: from imo-m25.mx.aol.com ([64.12.137.6]) by relay.thorcom.net with esmtp (Exim 4.43) id 1D6YJU-0008NQ-Uf for rsgb_lf_group@blacksheep.org; Wed, 02 Mar 2005 18:11:14 +0000 Received: from WarmSpgs@aol.com by imo-m25.mx.aol.com (mail_out_v37_r3.8.) id l.66.5203b843 (2519) for ; Wed, 2 Mar 2005 13:10:58 -0500 (EST) From: WarmSpgs@aol.com Message-ID: <66.5203b843.2f575bb2@aol.com> Date: Wed, 2 Mar 2005 13:10:58 EST To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 X-Mailer: 9.0 for Windows sub 5036 X-SPF-Result: relay.thorcom.net: domain of aol.com designates 64.12.137.6 as permitted sender X-Spam-Score: 0.2 (/) X-Spam-Report: autolearn=no,HTML_30_40=0.056,HTML_MESSAGE=0.001,NO_REAL_NAME=0.178 Subject: Re: LF: Re: Big Bad Amps -or " Practical use of Wilkinson combiner" Content-Type: text/html; charset=windows-1252 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_20_30,HTML_MESSAGE, NO_REAL_NAME 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

Another good reason to use a combiner is to preserve impedance matching. Running two amplifiers in direct parallel connection will not maximize the available power.

It can also reduce the risk of damaging both amplifiers if (or more accurately in the real world, "when") one loses drive, or its power supply quits, or other failure occurs. In commercial practice, we would never dream of strapping two amplifiers together without a combiner that provides some isolation between them... or at least employing a circulator in line with each output, which is not very practical at LF.

John