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[195.171.43.25]) by mx.google.com with ESMTP id mw15si1299679wic.81.2013.11.08.08.28.20 for ; Fri, 08 Nov 2013 08:28:20 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1VeodA-0007VC-AH for rs_out_1@blacksheep.org; Fri, 08 Nov 2013 16:09:56 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Veod9-0007V3-SV for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 16:09:55 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1Veod8-0001lM-83 for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2013 16:09:54 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id rA8G9qj2022739 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Fri, 8 Nov 2013 17:09:52 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id rA8G9oC9016981 for ; Fri, 8 Nov 2013 17:09:50 +0100 Message-ID: <527D0CCB.6090208@iup.uni-heidelberg.de> Date: Fri, 08 Nov 2013 17:09:47 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC908D5@ICTS-S-MBX2.luna.kuleuven.be>,<527CEE11.8070509@iup.uni-heidelberg.de> <7E7DFBB4D102A04DB5ADC88D66628A4A0FC98037@ICTS-S-MBX1.luna.kuleuven.be> In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FC98037@ICTS-S-MBX1.luna.kuleuven.be> X-Spam-Score: -2.3 (--) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hi Rik, Am 08.11.2013 16:06, schrieb Rik Strobbe: > > Hi Stefan, > > remote tuning of the loading should be done by optimizing SWR (at the > TX), not for maximum RF current. > > If one keeps that in mind there is no problem. > ...which is in agreement with what i said. But once you have matched your antenna to 50 Ohm on resonance and you can only vary the reactive part of the antennas impedance (after doing QSY), then you will get the maximum antenna current at best SWR (assuming that Rrad+Rloss is constant which is not to far from reality). [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 1908b49407fc556987226b536cc4bad0 Subject: Re: LF: remote antenna tuning Content-Type: multipart/alternative; boundary="------------080402020106090704050504" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,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 Status: O X-Status: X-Keywords: X-UID: 3437 This is a multi-part message in MIME format. --------------080402020106090704050504 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Rik, Am 08.11.2013 16:06, schrieb Rik Strobbe: > > Hi Stefan, > > remote tuning of the loading should be done by optimizing SWR (at the > TX), not for maximum RF current. > > If one keeps that in mind there is no problem. > ...which is in agreement with what i said. But once you have matched your antenna to 50 Ohm on resonance and you can only vary the reactive part of the antennas impedance (after doing QSY), then you will get the maximum antenna current at best SWR (assuming that Rrad+Rloss is constant which is not to far from reality). > I am not sure if I will keep the remote variometer > tuning. It needs some extra wires to the loading coil and > I am not sure how long the small DC motor will function properly with > all the rain and frost coming up. > Here it holds since more than 2 years for LF now.. 73, Stefan --------------080402020106090704050504 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Hi Rik,

Am 08.11.2013 16:06, schrieb Rik Strobbe:

Hi Stefan,

 

remote tuning of the loading should be done by optimizing SWR (at the TX), not for maximum RF current.

If one keeps that in mind there is no problem.

...which is in agreement with what i said.
But once you have matched your antenna to 50 Ohm on resonance and you can only vary the reactive part of the antennas impedance (after doing QSY), then you will get the maximum antenna current at best SWR (assuming that Rrad+Rloss is constant which is not to far from reality).

I am not sure if I will keep the remote variometer tuning. It needs some extra wires to the loading coil and I am not sure how long the small DC motor will function properly with all the rain and frost coming up.

Here it holds since more than 2 years for LF now..

73, Stefan

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