X-GM-THRID: 1238239651396210210 X-Gmail-Labels: rsgb lf Delivered-To: daveyxm@gmail.com Received: by 10.78.172.11 with SMTP id u11cs121528hue; Wed, 6 Jun 2007 11:03:41 -0700 (PDT) Received: by 10.82.183.19 with SMTP id g19mr1494976buf.1181153021385; Wed, 06 Jun 2007 11:03:41 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id 34si1139622nfu.2007.06.06.11.03.36; Wed, 06 Jun 2007 11:03:41 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Hvzlf-000427-4z for rs_out_1@blacksheep.org; Wed, 06 Jun 2007 18:57:59 +0100 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Hvzle-00041y-Gp for rsgb_lf_group@blacksheep.org; Wed, 06 Jun 2007 18:57:58 +0100 Received: from smarthost01.eng.net ([213.130.146.173]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Hvzld-0006ud-Ld for rsgb_lf_group@blacksheep.org; Wed, 06 Jun 2007 18:57:58 +0100 Received: from dsl89-213-1-77.as15444.net ([89.213.1.77] helo=[192.168.0.4]) by smarthost01.eng.net with esmtp (Exim 4.62) (envelope-from ) id 1Hvzld-0002G4-9A for rsgb_lf_group@blacksheep.org; Wed, 06 Jun 2007 18:57:57 +0100 Message-ID: <4666F599.4070302@m0dts.co.uk> Date: Wed, 06 Jun 2007 18:57:45 +0100 From: "Rob, M0DTS" User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: 136kHz Getting started.. Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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=0.0 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 Status: O X-Status: X-Keywords: X-UID: 1281 I'm not much of a designer so basically MAR-6 with 100R from 5v supply and 47nf caps for i/o coupling, the parallel tuned input just a ferrite wound inductor (from a old TV board) and some caps to bring into resonance on 136, it's not very high Q but it works to keep the broadcast breakthrough out! Nothing that complicated ... i like it to be simple! I have replaced the wire on my Loop (now much lower resistance copper wire, 2.5mm stranded) since last attempt and now is much sharper response around 137 and much stronger signals than before too. The first loop was about 20Ohms acros with the unknown 1mm wire i used ( shame because i have miles of the stuff! ) now with the new wire is about 1Ohm. Thanks to Alan about the tip on not connecting the sig gen directly to the loop, it was quite a way out of tune! the simple coupling loop worked much better.. Ready for some signals now.... Rob Nick Mclean (SYD) wrote: > Hi Rob, > Do you intend to let others on the list have enough of a circuit > diagragm that they could replicate what you are building? I for one > would like to build a front end to "hot up: one of my rigs here. > 73's > > Nic McLean > > VK2KXN / VK5ZAT > > Tel: 02 99410619 > > Fax: 02 98139009 > > Mobile: 0417 822 728 > >