Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4D200380000CA; Wed, 6 Jul 2011 13:23:17 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QeVnG-0007xG-3s for rs_out_1@blacksheep.org; Wed, 06 Jul 2011 18:21:46 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QeVnF-0007x7-HV for rsgb_lf_group@blacksheep.org; Wed, 06 Jul 2011 18:21:45 +0100 Received: from filter02.i-online.fr ([195.200.78.9]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QeVnD-0007kx-Vu for rsgb_lf_group@blacksheep.org; Wed, 06 Jul 2011 18:21:45 +0100 Received: from smtp.qtxt.dns-iol.com ([195.200.78.13]) by filter02.i-online.fr (IceWarp 10.2.2) with ESMTP (SSL) id PYB19128 for ; Wed, 06 Jul 2011 19:21:28 +0200 Received: (qmail 22713 invoked by uid 507); 6 Jul 2011 19:21:30 +0200 Received: from unknown (HELO ?192.168.1.101?) (john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 6 Jul 2011 19:21:30 +0200 Mime-Version: 1.0 (Apple Message framework v1084) From: John Rabson Date: Wed, 6 Jul 2011 19:21:35 +0200 Cc: Robin Gape Message-Id: <516CAAC2-5EF6-456A-80E9-A4697777371E@numeo.fr> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1084) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=windows-1252 Subject: LF: Circuit Analysis Programs Content-Transfer-Encoding: quoted-printable 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 x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:279475936:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d608a4e149a0477e3 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none I am experimenting with various forms of matching network to go between = my 136kHz antenna and the transmitter. It would be very handy if I had a = fairly simple circuit analysis program with which to do the following: Having measured the input impedance to the combined matching unit and = antenna, then =93subtract=94 the components of the matching network, see = what I get and compare it with what I actually measure. I'm not always = convinced that what I measure is what I think I'm measuring. Platforms available: XP, Linux and MacOs X. Yes, I could write something, but somebody must have done this and there = is no point in reinventing the wheel. Any suggestions, please? Regards John F5VLF=