Return-Path: Received: from mtain-di07.r1000.mx.aol.com (mtain-di07.r1000.mx.aol.com [172.29.64.11]) by air-dd03.mail.aol.com (v129.4) with ESMTP id MAILINDD034-86ab4d49609d2ba; Wed, 02 Feb 2011 08:48:13 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-di07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 337713800009E; Wed, 2 Feb 2011 08:48:10 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pkd3G-0003om-0G for rs_out_1@blacksheep.org; Wed, 02 Feb 2011 13:47:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pkd3F-0003od-Ki for rsgb_lf_group@blacksheep.org; Wed, 02 Feb 2011 13:47:17 +0000 Received: from mail.foreach.it ([213.254.15.250] helo=for01.foreach.it) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pkd3D-0003cZ-1e for rsgb_lf_group@blacksheep.org; Wed, 02 Feb 2011 13:47:17 +0000 Received: by for01.foreach.it (Postfix, from userid 65534) id B241428005F; Wed, 2 Feb 2011 14:45:41 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by for01.foreach.it (Postfix) with ESMTP id 6F42428005E for ; Wed, 2 Feb 2011 14:45:41 +0100 (CET) X-Virus-Scanned: amavisd-new at ebirds.it Received: from for01.foreach.it ([127.0.0.1]) by localhost (for01.foreach.it [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zb+b0gQqlLmg for ; Wed, 2 Feb 2011 14:45:41 +0100 (CET) Received: from imac2 (host185-41-static.24-87-b.business.telecomitalia.it [87.24.41.185]) by for01.foreach.it (Postfix) with ESMTP id 2832128005C for ; Wed, 2 Feb 2011 14:45:41 +0100 (CET) X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Wed, 02 Feb 2011 14:47:13 +0100 To: rsgb_lf_group@blacksheep.org From: Marco IK1ODO -2 In-Reply-To: <637365.87460.qm@web111904.mail.gq1.yahoo.com> References: <637365.87460.qm@web111904.mail.gq1.yahoo.com> Mime-Version: 1.0 Message-Id: <20110202134541.6F42428005E@for01.foreach.it> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Dumb homebrewer - Advice needed Content-Type: text/plain; charset="us-ascii"; format=flowed 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: 3039ac1d400b4d49609a6f97 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none At 13:51 02-02-11, you wrote: >Hello LF, > >I would like to improve a bit my home-made pre-selector for LF/MF. I >would appreciate very basic advice on "mechanical" aspects like the >following: the pre-selector has some molded inductors that can be >selected by means of a rotary switch (band selector). Is it >advisable to mount the inductors directly on the switch terminals or >on a separate (small) PCB? Shorter is better in this case or not? > >Best regards >Daniele With Lambda=2200 m everthing shorter than L/10 (220 m) is "short" :-) Don't worry, 30 cm at 137 kHz is like a low inductance microwave bonding. Mechanical considerations prevail. 73 - Marco IK1ODO