Return-Path: X-Spam-DCC: paranoid 1181; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, FORGED_RCVD_HELO autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tAJIWieC007581 for ; Thu, 19 Nov 2015 19:32:44 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ZzTxI-00045Q-Hn for rs_out_1@blacksheep.org; Thu, 19 Nov 2015 18:29:12 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ZzTxI-00045H-3d for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 18:29:12 +0000 Received: from rhcavuit02.kulnet.kuleuven.be ([134.58.240.130] helo=cavuit02.kulnet.kuleuven.be) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.86) (envelope-from ) id 1ZzTwD-0000Qr-Vu for rsgb_lf_group@blacksheep.org; Thu, 19 Nov 2015 18:29:10 +0000 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 4B9D0128342.A34E2 X-KULeuven-Information: Katholieke Universiteit Leuven Received: from icts-p-smtps-1.cc.kuleuven.be (icts-p-smtps-1e.kulnet.kuleuven.be [134.58.240.33]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 4B9D0128342 for ; Thu, 19 Nov 2015 19:27:47 +0100 (CET) Received: from ICTS-S-HUB4.luna.kuleuven.be (icts-s-hub4.luna.kuleuven.be [10.112.9.18]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by icts-p-smtps-1.cc.kuleuven.be (Postfix) with ESMTPS id 48A4640AD for ; Thu, 19 Nov 2015 19:27:44 +0100 (CET) Received: from ICTS-S-MBX1.luna.kuleuven.be ([fe80::edaf:341f:90e:f70e]) by ICTS-S-HUB4.luna.kuleuven.be ([fe80::c11b:83f0:c46c:c366%26]) with mapi id 14.03.0224.002; Thu, 19 Nov 2015 19:27:43 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Thread-Topic: LF: Re: Antenna relays Thread-Index: AQHRIuQVIwdFTwIAtEOBZ/4zcqE9XZ6jqOvP Date: Thu, 19 Nov 2015 18:27:43 +0000 Message-ID: <7E7DFBB4D102A04DB5ADC88D66628A4A44476711@ICTS-S-MBX1.luna.kuleuven.be> References: <1729369062.20151119120030@chriswilson.tv> <1C735FA296594DF897C48882843B0EB7@gnat> <564DD9F0.3020005@posteo.de> <564DDE76.6010403@vsas.de> <1242998235.20151119145225@chriswilson.tv>,<564DF235.90008@posteo.de> In-Reply-To: <564DF235.90008@posteo.de> Accept-Language: nl-BE, en-GB, en-US Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.112.11.11] MIME-Version: 1.0 X-HELO-Warning: Remote host 134.58.240.130 (rhcavuit02.kulnet.kuleuven.be) used invalid HELO/EHLO cavuit02.kulnet.kuleuven.be - verification failed X-Scan-Signature: f38d515a9cad1e977fcfe251941a8120 Subject: RE: LF: Re: Antenna relays Content-Type: text/plain; charset="us-ascii" 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by paranoid.lipkowski.org id tAJIWieC007581 Status: RO X-Status: X-Keywords: X-UID: 5194 Hello Stefan, I am not sure a (lossless) capacitor in parallel with the coil will lower the antenna efficiency. I would assume that it will affect the antenna impedance as seen from the TX, but will not change the ratio Rrad/Rloss (what determines the antenna effeciency). 73, Rik ON7YD ________________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens DK7FC [selberdenken@posteo.de] Verzonden: donderdag 19 november 2015 17:00 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: Re: Antenna relays Hi Chris, I would assume such a large HV switch and the whole construction adds a few 10 pF to your system. This C has of course no radiation resistance. So this lowers your antenna efficiency a bit! 73, Stefan Am 19.11.2015 15:52, schrieb Chris Wilson: > Hello Vincent, > > Thursday, November 19, 2015 > > That looks a hefty beast, never seen one though. I do have a R140 amp > in the loft, awaiting power supply and control board completion. I > might e-mail the Polish ham I got the amp from and see if he knows of > any of those! I wonder how much they would cost though? Thanks for the > link, I know Dom F1FRV quite well, he might know who has one.