Return-Path: Received: from mtain-dj07.r1000.mx.aol.com (mtain-dj07.r1000.mail.aol.com [172.19.187.143]) by air-dc08.mail.aol.com (v127_r1.1) with ESMTP id MAILINDC081-86044bafea731ba; Sun, 28 Mar 2010 19:47:00 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dj07.r1000.mx.aol.com (Internet Inbound) with ESMTP id C1CE8380000AE; Sun, 28 Mar 2010 19:46:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nw2Ag-0008Pn-4W for rs_out_1@blacksheep.org; Mon, 29 Mar 2010 00:45:34 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nw2Af-0008Pe-PB for rsgb_lf_group@blacksheep.org; Mon, 29 Mar 2010 00:45:33 +0100 Received: from relay.pcl-ipout02.plus.net ([212.159.7.100]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nw2Ae-0002rZ-08 for rsgb_lf_group@blacksheep.org; Mon, 29 Mar 2010 00:45:33 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AqQEAJ+Gr0vUnwpC/2dsb2JhbACIboZVjFi+BoUBBA Received: from mailc03.plus.net (HELO pih-smtp-proxy02.plus.net) ([212.159.10.66]) by relay.pcl-ipout02.plus.net with ESMTP; 29 Mar 2010 00:45:28 +0100 Received: from 173.51.adsl.brightview.com ([80.189.51.173] helo=tc402d33c25094) by pih-smtp-proxy02.plus.net with smtp (Exim 4.63) (envelope-from ) id 1Nw2AZ-0002Hs-M2 for rsgb_lf_group@blacksheep.org; Mon, 29 Mar 2010 00:45:27 +0100 Message-ID: <41A78A5B039441DC907E5876DA9A9B86@tc402d33c25094> From: "Julian Hardstone" To: References: <71A8DF2CFC0B4036B2664789F2AC98E0@PCCasa> Date: Mon, 29 Mar 2010 00:45:17 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36 Subject: LF: Re: Balun for tuned loop antenna Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original 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=1.6 required=5.0 tests=FORGED_MUA_OUTLOOK 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: 3039cdbc9d0c4bafea716c2a X-AOL-IP: 193.82.116.20 Daniele - I see from the schematic http://radio-timetraveller.blogspot.com/2009/08/tecsun-pl-600-review-and-schematics.html that the MF-HF input to the PL-600 is a LPF followed by a balanced mixer Also, I believe that the PL-600 is similar to the earlier -1103 sets, so maybe the same 'easter-egg trick' works for the -600 and you did not have to use a soldering iron to connect an MF antenna..? If the LPF is the same as the -1103, C88 will be 82p, C96 7p, C97 68p, so maybe Zin is 75ohm >>> I managed to enable (by means of the soldering iron :-)) the external antenna jack also for MF and LF on PL-600 (normally it only works in HF)...<<<