Return-Path: Received: from mtain-mj04.r1000.mx.aol.com (mtain-mj04.r1000.mail.aol.com [172.21.164.88]) by air-da01.mail.aol.com (v129.10) with ESMTP id MAILINDA011-85e34db83bf83a3; Wed, 27 Apr 2011 11:53:28 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mj04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 563683800006E; Wed, 27 Apr 2011 11:53:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1QF72A-0006Z6-Bq for rs_out_1@blacksheep.org; Wed, 27 Apr 2011 16:52:10 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1QF729-0006Yx-M9 for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 16:52:09 +0100 Received: from outbound04.telus.net ([199.185.220.223] helo=defout.telus.net) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1QF726-0001bl-W5 for rsgb_lf_group@blacksheep.org; Wed, 27 Apr 2011 16:52:09 +0100 Received: from edtncm03 ([199.185.220.221]) by priv-edtnes25.telusplanet.net (InterMail vM.8.01.03.00 201-2260-125-20100507) with ESMTP id <20110427155204.JROQ7242.priv-edtnes25.telusplanet.net@edtncm03> for ; Wed, 27 Apr 2011 09:52:04 -0600 Received: from [192.168.1.115] ([75.157.142.115]) by edtncm03 with bizsmtp id cfs31g02D2Vbb3f01fs39q; Wed, 27 Apr 2011 09:52:04 -0600 X-Telus-Outbound-IP: 75.157.142.115 X-Authority-Analysis: v=1.1 cv=K9GHI98SDtD/JTh6fJYait4M9FyL3ZUQ9yWMBOXN4X8= c=1 sm=2 a=jVez_htjv6wA:10 a=SfOitS9oJO4A:10 a=LGgl8L9ij00A:10 a=8nJEP1OIZ-IA:10 a=fnYqA7hvAAAA:8 a=j6Q1dnSHAAAA:8 a=A06HpNCPAAAA:20 a=8P0jffWtAAAA:20 a=lmx28RDMEO5u4fJ_QXQA:9 a=wPNLvfGTeEIA:10 a=gA6IeH5FQcgA:10 a=NWVoK91CQyQA:10 Message-ID: <4DB83BA0.7020800@telus.net> Date: Wed, 27 Apr 2011 08:52:00 -0700 From: Scott Tilley User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.15) Gecko/20110303 Lightning/1.0b2 Thunderbird/3.1.9 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: More 8.97kHz WSPR decodes - changed PC here 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=0.9 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-sid: 3039400c89a84db83bf339c2 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Hi Roger Good stuff! In my recent experiments on 9KHz Earth mode I discovered my laptop's on board sound card was very noisy particularly when operating off battery. As a result, I added a quality USB professional audio grade sound card and discovered that it is much more sensitive than the internal soundcard. Despite the noise in the older soundcard, I was able to copy PSK31 out to about 4km from the TX (at 35W), mind you my base is about 0.5km long... I was able to detect the earth mode signal at over 10km using the same older noisy card. I suspect if I repeated the experiments with the new sound card I'd have much better results. 73 Scott VE7TIL On 4/27/2011 7:19 AM, Roger Lapthorn wrote: > As an experiment I changed over to my wife's laptop and got immediate > decodes of G6ALB's VLF earth mode signal (3km) at -17dB S/N, > suggesting the issue with lack of decodes may be with my soundcard and > not Andrew's. > > 1408 -17 -0.6 0.008986 0 G6ALB JO02 47 > 1410 -17 -0.6 0.008986 0 G6ALB JO02 47 > 1412 -17 -1.2 0.008986 0 G6ALB JO02 47 > 1414 -17 -0.8 0.008986 0 G6ALB JO02 47 > 1416 -17 -0.8 0.008986 0 G6ALB JO02 47 > > This is a very solid signal on the 80m square single turn vertical > wire loop antenna. Andrew is using 44W to an earth electrode antenna. > > 73s > Roger G3XBM > > -- > http://g3xbm-qrp.blogspot.com/ > http://www.g3xbm.co.uk > http://www.youtube.com/user/g3xbm > https://sites.google.com/site/sub9khz/ >