Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id B264638000085; Sun, 17 Feb 2013 04:47:51 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1U70pi-0001je-Uk for rs_out_1@blacksheep.org; Sun, 17 Feb 2013 09:46:54 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1U70pi-0001jV-FE for rsgb_lf_group@blacksheep.org; Sun, 17 Feb 2013 09:46:54 +0000 Received: from mout.gmx.net ([212.227.17.21]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1U70pg-0002vL-EL for rsgb_lf_group@blacksheep.org; Sun, 17 Feb 2013 09:46:53 +0000 Received: from mailout-de.gmx.net ([10.1.76.10]) by mrigmx.server.lan (mrigmx002) with ESMTP (Nemesis) id 0LxrgI-1UuPyS2Ztc-015Jaq for =?utf-8?q?;?= Sun, 17 Feb 2013 10:46:36 +0100 Received: (qmail invoked by alias); 17 Feb 2013 09:46:36 -0000 Received: from p4FEDA5AC.dip.t-dialin.net (EHLO Clemens0811) [79.237.165.172] by mail.gmx.net (mp010) with SMTP; 17 Feb 2013 10:46:36 +0100 X-Authenticated: #17214767 X-Provags-ID: V01U2FsdGVkX1/HsggLC0jHhnhEurMLyUho+flebkhUNx+fqCrCqY 8qfqvJJ3cKO3+s From: "Clemens Paul" To: References: <511FF5F0.1080603@iup.uni-heidelberg.de> In-Reply-To: Date: Sun, 17 Feb 2013 10:46:33 +0100 Message-ID: <388C8C94892242EC936B3345D5E9B595@Clemens0811> MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 Thread-Index: Ac4Mik3DtvXklGQmSV+Co672vaEYkgAXbQjAAALXthA= X-Y-GMX-Trusted: 0 X-Spam-Score: -0.6 (/) 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: Typo correction in the third line: It must read **loaded** Q. 73 Clemens DL4RAJ > Content analysis details: (-0.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.17.21 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (cpaul[at]gmx.net) -0.0 SPF_PASS SPF: sender matches SPF record -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 0cdfd8d5ce44f1724c623c4ac9f44df6 Subject: RE: LF: Re: how to increase the Q of my loading coil? Content-Type: text/plain; charset="iso-8859-1" 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-sid: 3039ac1db4055120a746296b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Typo correction in the third line: It must read **loaded** Q. 73 Clemens DL4RAJ =20 >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org=20 >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Clemens Paul >Sent: Sunday, February 17, 2013 10:30 AM >To: rsgb_lf_group@blacksheep.org >Subject: RE: LF: Re: how to increase the Q of my loading coil? > >Stefan, > >>So a high Q must be the goal, loaded or unloaded. > >Regarding unloaded Q I think there is agreement > >Regarding unloaded Q it depends HOW it is increased. >As Jim has pointed out increasing unloaded coil Q also=20 >increases somewhat the overall system loaded Q by reducing=20 >circuit total R, this is perhaps what Graham was concerned about. >But the benefit overweighs this small disadvantage.=20 > >As a matter of fact with a matching network consisting of two=20 >reactive elements (L,C) or of one coil and an autotransformer=20 >as we have here it is not possible to choose a desired loaded=20 >Q (without the exception above). >You get the lowest possible loaded Q anyhow and it is=20 >determined by the complex impedance of the antenna. >But if you match with three reactive elements like a Pi- or=20 >T-Network then you can choose - within certain limits - the=20 >loaded Q by choosing the components values but it will be=20 >always higher than with two elements. >High XL and XC components will result in a high loaded Q. >In this case time the high loaded Q is detrimental for=20 >efficiency,losses and heat go up, so THIS way of increasing=20 >loaded Q should be avoided. > >The source resistance of a transmitter or a vector network=20 >analyzer decreases the overall loaded system Q which increases=20 >bandwidth. >If you would feed the system by a voltage source the 3dB=20 >BW-points would coincide with a VSWR of 5,9. >With a 50 Ohm source you have the 3dB points at a VSWR of 2,6. > >My apologizes if this all has been too long and boring. :-) > >73 >Clemens >DL4RAJ=20 > > > > > > >>-----Original Message----- >>From: owner-rsgb_lf_group@blacksheep.org >>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of=20 >Stefan Sch=E4fer >>Sent: Saturday, February 16, 2013 10:11 PM >>To: rsgb_lf_group@blacksheep.org >>Subject: Re: LF: Re: how to increase the Q of my loading coil? >> >> >>Am 16.02.2013 11:10, schrieb Clemens Paul: >>> [...] >>> The higher the *loaded circuit* Q the higher are the losses in all=20 >>> involved components including the coil due to increasing >>circulating currents. >>> Given a certain circuit increasing the Q of its components >>always will >>> reduce overall losses of that circuit. >>> >>> 73 >>> Clemens >>> DL4RAJ >> >>...however if the transmit power is kept constant, then the radiated=20 >>power is higher, due to the higher currents through the radiation=20 >>resistance. Thus the losses must be lower here. >>It is not a constant voltage source, at least Dimitris' class E PA=20 >>isn't :-) So a high Q must be the goal, loaded or unloaded. >> >>73, Stefan/DK7FC >> >> >> >>----- >>E-Mail ist virenfrei. >>Von AVG =FCberpr=FCft - www.avg.de >>Version: 2013.0.2899 / Virendatenbank: 2639/6104 - >>Ausgabedatum: 14.02.2013 >> > > > > >----- >E-Mail ist virenfrei. >Von AVG =FCberpr=FCft - www.avg.de >Version: 2013.0.2899 / Virendatenbank: 2639/6104 -=20 >Ausgabedatum: 14.02.2013=20 > >