Return-Path: <owner-rsgb_lf_group@blacksheep.org> Received: from rly-mf01.mx.aol.com (rly-mf01.mail.aol.com [172.20.29.171]) by air-mf10.mail.aol.com (v121_r4.4) with ESMTP id MAILINMF104-941493713271aa; Wed, 03 Dec 2008 18:16:33 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mf01.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINMF017-941493713271aa; Wed, 03 Dec 2008 18:16:14 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1L80ht-0001B3-44 for rs_out_1@blacksheep.org; Wed, 03 Dec 2008 23:00:33 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1L80hp-0001Au-5u for rsgb_lf_group@blacksheep.org; Wed, 03 Dec 2008 23:00:29 +0000 Received: from imo-d04.mx.aol.com ([205.188.157.36]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from <MarkusVester@aol.com>) id 1L80hJ-0003QT-0f for rsgb_lf_group@blacksheep.org; Wed, 03 Dec 2008 23:00:29 +0000 Received: from MarkusVester@aol.com by imo-d04.mx.aol.com (mail_out_v39.1.) id l.bbf.3eb3c93b (34953) for <rsgb_lf_group@blacksheep.org>; Wed, 3 Dec 2008 17:59:15 -0500 (EST) Received: from Black (g229122243.adsl.alicedsl.de [92.229.122.243]) by cia-da06.mx.aol.com (v121_r4.6) with ESMTP id MAILCIADA062-888949370f41e6; Wed, 03 Dec 2008 17:59:14 -0500 Message-ID: <0C12ACD9C7BC401986091421167E748D@Black> From: "Markus Vester" <markusvester@aol.com> To: <rsgb_lf_group@blacksheep.org> References: <004301c9549b$d0f65b40$0301a8c0@mal769a60aa920> <E76ED69FBF9E44BCB24956AB612C2C64@tc402d33c25094> In-Reply-To: <E76ED69FBF9E44BCB24956AB612C2C64@tc402d33c25094> Date: Wed, 3 Dec 2008 23:59:07 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16669 X-Spam-Flag:NO X-Karma: 0: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: DEGEN 1103 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-IP: 193.82.116.20 Hello LF, I have one of those from Shenzhen, and put it to use for a temporary 500 kHz grabber a few months ago. With an external antenna, sensitivity was not a problem, but a tuned circuit was required at the input to mitigate MF and LF broadcast intermodulation. I circumvented the frequency instability by switching the receiver to AM-wide demodulation and injecting an externally generated 500 kHz LO signal. The Degen proved valuable for searching local QRM on LF. Walking around at night with an external ferrite antenna allowed me to locate noisy underground ADSL and power lines to within a few centimeters. One is almost tempted to dig and cut... The receiver also tunes below 100 kHz but does indeed become insensitive there - DCF77 and HBG are easily audible on the telescope rod, but VLF signals are buried in a heap of LO sideband noise. Best wishes Markus ----- Original Message ----- From: "Julian Hardstone" <julian@rosestone.me.uk> To: <rsgb_lf_group@blacksheep.org> Sent: Wednesday, December 03, 2008 12:50 PM Subject: LF: Re: DEGEN 1103 >A few observations - http://www.rosestone.me.uk/Degen.html including details of how best to use the 1103 at MF/LF and below >100kHz. If you should order an 1103 from the reputable dealer Liypn, you'll see he offers a couple of loop antennas > >