Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v9QINhHv027785 for ; Thu, 26 Oct 2017 20:23:46 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1e7mf5-0001mo-LO for rs_out_1@blacksheep.org; Thu, 26 Oct 2017 19:13:47 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1e7mf3-0001mf-QB for rsgb_lf_group@blacksheep.org; Thu, 26 Oct 2017 19:13:45 +0100 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1e7mf1-0001u6-3y for rsgb_lf_group@blacksheep.org; Thu, 26 Oct 2017 19:13:44 +0100 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:References:Reply-To:To:From:Subject:Sender:Cc: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=AxH+6ZYmIVwFy1q+Zd583GpQKTGcrIyFsfVeRfLfvNg=; b=k9EFBcHS4m0UNGWCdkjtDGvh0U Uw/gPgZ2zPYBhgEupi/ZuIiuuSOWWeDUoeOqhgAhxPVwy83z2B976xySIV2/Jw8OJD6/3NIc01N0r b96vBGpYsFlVFdBAFRzq22txXHhbKRRfmY9MI6Js0vGouSE33/OzCyFi4q5izPZFNOfM=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:48679 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1e7mf0-0006wq-M3 for rsgb_lf_group@blacksheep.org; Thu, 26 Oct 2017 19:13:42 +0100 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 1CBF340027A for ; Thu, 26 Oct 2017 18:13:42 +0000 (UTC) From: Paul Nicholson To: rsgb_lf_group@blacksheep.org References: <15f5559fe36-c0b-25e91@webjas-vac031.srv.aolmail.net> <59F1F06C.6070805@posteo.de> <4c256fa8-678f-9017-19c6-b196247de591@abelian.org> <0a54c86d-01fd-1362-a9d9-5b5f0010dd10@abelian.org> Message-ID: <2f709771-16a0-db0b-2d3b-f3f9fb6da0c1@abelian.org> Date: Thu, 26 Oct 2017 18:13:42 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <0a54c86d-01fd-1362-a9d9-5b5f0010dd10@abelian.org> Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: I wrote: > Is it too late to switch to 16K23A with 4 second symbols? Oh I forgot, the Windows version doesn't have 16K23A yet. I must finish the testing... [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: c0336009bd9bab526ca27d297ea7579a Subject: Re: VLF: 300 mA on 5170 Hz Content-Type: text/plain; charset=utf-8; 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 I wrote: > Is it too late to switch to 16K23A with 4 second symbols? Oh I forgot, the Windows version doesn't have 16K23A yet. I must finish the testing... Eb/N0 and phase for the four recent 1 char messages: Night H-field (new) E-field Combined 20/21 7.1 dB -165.7 deg 13.0 dB -168.1 deg 13.6 dB -167.7 deg 22/23 6.5 dB 174.9 deg 11.3 dB -166.7 deg 11.8 dB -168.7 deg 23/24 6.8 dB -174.2 deg 13.2 dB -155.6 deg 13.8 dB -157.6 deg 24/25 7.7 dB 168.5 deg 10.8 dB -176.1 deg 12.7 dB 176.7 deg The new E-field rx is exposing poor performance of the loop rx at this frequency. The loops should always be better than the vertical E-field, due to directivity. It is OK at 8270, eg VO1NA H-field E-field 2017-10-20_23:00,+8h 12.13 dB 10.75 dB 2017-10-21_10:00,+8h 12.30 dB 9.3 dB I suspect the problem is due to mains harmonics reducing effectiveness of sferic blanking. The rx itself is quite low noise at 5170. Main harmonics are usually worse in the H-field because of non-linear load currents. Also they are not so constant. Plus they have much stronger sidebands than in the E-field. I'm not sure my loops are in the best location. There's an underground stream running beneath the antenna, just a metre down. It drains off the hills behind and I suspect it may be concentrating 50Hz ground currents. I hope to survey the area for a lower hum location. This is quite difficult with H-field because the hum level is not constant, therefore more complicated to collect readings from a portable loop. -- Paul Nicholson --