Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, SPF_PASS,T_DKIM_INVALID,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: : mailn 1480; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id v79DoZ95029549 for ; Wed, 9 Aug 2017 15:50:36 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dfRDD-0002f9-Ox for rs_out_1@blacksheep.org; Wed, 09 Aug 2017 14:39:51 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dfRDA-0002f0-Vl for rsgb_lf_group@blacksheep.org; Wed, 09 Aug 2017 14:39:48 +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 1dfRD7-0007cr-EC for rsgb_lf_group@blacksheep.org; Wed, 09 Aug 2017 14:39:47 +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:From:References:To:Subject:Sender:Reply-To: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=NvZR45SYlfdfwmYYHJVcg1fNkE7aSDnaFRzbDBwIf18=; b=iDZnnMTjewcsdmgtH+OUFMrCsZ kaPsd0XEyaLLveHJdOF0IPiLqeLNa6sbbTKYz5jrJ/6NWeCUGvI0muEw39qvEzt5zZJQzcSUUBE/Y 6Uf4REMX798yZnhgvMcg2pBTadLhdhbcgIKX/yfTlNI/BauenV5PvjoNNwBaS5sD3iTU=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:53866 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 1dfRD5-0007dg-96 for rsgb_lf_group@blacksheep.org; Wed, 09 Aug 2017 14:39:43 +0100 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 6BB3C40073E for ; Wed, 9 Aug 2017 13:39:42 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <15db2643c6f-5f13-23c2@webprd-m101.mail.aol.com> <5986259C.8020409@posteo.de> <598A1DBA.9040404@posteo.de> From: Paul Nicholson Message-ID: <31b55d24-5fc0-63cd-9e8d-e0b0d25af8c6@abelian.org> Date: Wed, 9 Aug 2017 13:39:42 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <598A1DBA.9040404@posteo.de> 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-Scan-Signature: 1708620d3ce65bee0beaaede7929769a Subject: Re: VLF: Carrier on 3675.005 Hz Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.75 Status: O X-Status: X-Keywords: X-UID: 12351 I'm measuring about 0.016 fT daytime, 0.045 fT nighttime. Daytime signal phase leads the night phase by about 67 degrees. Combining and normalising day/night signals and excluding the terminator periods gives http://abelian.org/vlf/tmp/170809a.gif Still not significant, only about 3.5 sigma, 10.9 dB S/N in 1.13 uHz. > Seems the result is even poorer than on 2.97 kHz? Probably just because I'm not using the E-field. > i would try some first EbNaut on that 82 km band over > to DL0AO in 226 km. Yes, if the S/N is good enough at DL0A0. Not much use continuing with carrier when I only have half a receiver. This afternoon I'll do some more work on the new E-field rx. Running side-by-side comparison with the old rx. I've been working on the new rx for over 2 years but the system noise is still consistently 0.1 dB worse than the existing rx. The front-end noise of the new rx is lower but the bandwidth is wider. The extra signal is raising the noise floor slightly due to a tiny amount of distortion in the line driver and isolating transformers. On the test bench the new rx does very well: very low noise and low distortion. But with the full signal from the antenna there is enough mixing to slightly raise the noise floor. I just need that 0.1 dB and also to cure some mechanical noises (microphonics) when the wind blows. PS, the new rx also also covers 137 kHz! -- Paul Nicholson --