Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3D4523800011F; Wed, 14 Sep 2011 12:51:18 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R3sd7-00030k-2v for rs_out_1@blacksheep.org; Wed, 14 Sep 2011 17:48:09 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R3sd2-0002wv-8d for rsgb_lf_group@blacksheep.org; Wed, 14 Sep 2011 17:48:04 +0100 Received: from smtp-out08.email.it ([212.97.34.23]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from <smtp01@email.it>) id 1R3sd0-0007xb-KH for rsgb_lf_group@blacksheep.org; Wed, 14 Sep 2011 17:48:03 +0100 Received: from localhost (localhost.localdomain [127.0.0.1]) by smtp-out08.email.it (Postfix) with ESMTP id 39024C015 for <rsgb_lf_group@blacksheep.org>; Wed, 14 Sep 2011 18:48:01 +0200 (CEST) X-Virus-Scanned: amavisd-new at email.it Received: from smtp-out08.email.it ([127.0.0.1]) by localhost (smtp-out08.email.it [127.0.0.1]) (amavisd-new, port 10024) with LMTP id bEAXMst54roJ for <rsgb_lf_group@blacksheep.org>; Wed, 14 Sep 2011 18:48:01 +0200 (CEST) Received: from dialup-62-11-230-207.clienti.tiscali.it (dialup-62-11-230-207.clienti.tiscali.it [62.11.230.207]) by smtp-out08.email.it (Postfix) with ESMTP id 973F1C00E for <rsgb_lf_group@blacksheep.org>; Wed, 14 Sep 2011 18:47:36 +0200 (CEST) From: Claudio Pozzi <smtp01@email.it> To: rsgb_lf_group@blacksheep.org Date: Wed, 14 Sep 2011 18:41:40 +0200 User-Agent: KMail/1.9.5 References: <4E6E0AD4.4838.465714@mike.dennison.ntlworld.com> <1315833746.18312.YahooMailNeo@web29503.mail.ird.yahoo.com> <1315926429.28889.YahooMailNeo@web29518.mail.ird.yahoo.com> In-Reply-To: <1315926429.28889.YahooMailNeo@web29518.mail.ird.yahoo.com> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <201109141841.40133.smtp01@email.it> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Simple yet reliable method for measuring Q? Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 0:2:378352960:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4ad04e70db861bd9 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none On Tuesday 13 September 2011 17:07, Daniele Tincani wrote: > Hello LF, > > apologies for being a bit OT. > I'm looking for a (reasonably) reliable method for measuring Q of a > parallel LC resonator at LF frequencies (ferrite-cored coil + variable air > cap). I have a spectrum analyser (without tracking capability), > oscilloscope with 10x probes, RF generator with built-in attenuator and > sweep function, frequency counter. I'm doubtful in particular about how to > avoid loading the LC with either the output Z of the generator or the input > Z of the meter (or both). Any tips? > > Best regards > Daniele I suggest you this book: Wes Hayward (W7ZOI), Rick Campbell (KK7B), Bob Larkin (W7PUA), "Experimental Methods in RF Design", ARRL, 2003, ISBN # 0-87259-879-9 In Italy you can ask Ediradio (Milano), about 50 Euro. See page 7.36 Ciao Claudio, IK2PII -- Claudio Pozzi - Happy Linux User - http://www.qsl.net/ik2pii -- Caselle da 1GB, trasmetti allegati fino a 3GB e in piu' IMAP, POP3 e SMTP autenticato? GRATIS solo con Email.it http://www.email.it/f Sponsor: Fino al 30 Settembre i bambini sotto i 12 anni in camera con 2 adulti 1 e' GRATIS all'hotel Club di Riccione Clicca qui: http://adv.email.it/cgi-bin/foclick.cgi?mid=11788&d=14-9