Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,RCVD_IN_DNSWL_MED,SPF_PASS, T_DKIM_INVALID 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+deb8u1) with ESMTP id v0I6kfW4019643 for ; Wed, 18 Jan 2017 07:46:42 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1cTjtq-0004l0-Dy for rs_out_1@blacksheep.org; Wed, 18 Jan 2017 06:39:14 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1cTjtp-0004kr-GZ for rsgb_lf_group@blacksheep.org; Wed, 18 Jan 2017 06:39:13 +0000 Received: from resqmta-ch2-12v.sys.comcast.net ([2001:558:fe21:29:69:252:207:44]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.87) (envelope-from ) id 1cTjtm-0003jU-PF for rsgb_lf_group@blacksheep.org; Wed, 18 Jan 2017 06:39:12 +0000 Received: from resomta-ch2-06v.sys.comcast.net ([69.252.207.102]) by resqmta-ch2-12v.sys.comcast.net with SMTP id TjthczRZqlNFyTjthcPSI4; Wed, 18 Jan 2017 06:39:05 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20161114; t=1484721545; bh=ryfw5l6NlWLEylUNvh8Cjz1Jx/kxjInDrdcy4URmlWc=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=j4ho9kQKAHtLxf/+35jhkAJuQS4LloCJYuIkIucKOj856C0Cr2WRztd96MJiw///T beLymGrYMTyNmBFJqCiJEkBXTVdonhqInT7CD+P7G6W3y4qM8OZOPdTvOm6dqND6Ru oyV2qLUTnysa+B42boYXH/22TSLYoUzuHPtOMnxly7RMR2FC/LhoOAdyTYKl5GXRLB 2Qfy2dbktCOgw+wY0t+Faz4Lvt7vhy/Mu95hs78xYTW/UN0euVe6AxidKIcx7wKWWp jGpYJin7UxD+jnOriFLBgzWuaoF/N2y6pGR21tKgdbuLINxZWMlVo0a5jg+F21Uuu7 ybTlmzi8X+22w== Received: from Owner ([IPv6:2601:141:0:bec5:d8de:a6e4:c8d4:6a53]) by resomta-ch2-06v.sys.comcast.net with SMTP id TjtgcPr8K1ow6TjthcZkju; Wed, 18 Jan 2017 06:39:05 +0000 From: To: References: <0166BDF4-A692-4E83-AA17-DE6FC012EC1F@talktalk.net> <877D570598134B12ADC67A8D874C9F32@AGB> <23DE64E288C84B19B7C9212A6CADFBB8@PCPMF> <587E6B7A.6090204@posteo.de> <587E72D1.3080109@posteo.de> <587E7A37.1060504@abelian.org> In-Reply-To: <587E7A37.1060504@abelian.org> Date: Wed, 18 Jan 2017 01:38:54 -0500 Message-ID: <00a601d27155$8fc83ff0$af58bfd0$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQJBchpq2f0E47P4B64S8FJ0fXFz6wM09MmgAvpFZTsCQLLlRwMeCXrWAh1PFDEBJyBUYAEj/0BhAerNi8yf0I1nEA== Content-Language: en-us X-CMAE-Envelope: MS4wfHJC+iZ3nDfJY+Pp38vH/2DVPQg4fc5VLffvfWhmHrWGSQVnb4dq1EPlxuQtxP8XOAAE9AxdXRBebaN51u5C7Dm+leLdBIS7bz29Z5xVv1owKNYNfnSl 9+RnSQxNaFxS+2vM0OGaaZbIip9Ujt4OrMo= X-Scan-Signature: 33d261536bb1467bb13d5764461d5ec4 Subject: RE: VLF: Carrier on 8270 Hz Content-Type: text/plain; charset="utf-8" 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 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by lipkowski.org id v0I6kfW4019643 Status: RO X-Status: X-Keywords: X-UID: 10227 Hello Paul and Stefan, If 0.7fT at Paul's location means roughly 50uW (conservatively?), does it seem reasonable that if I could confirm (for example) a 39.6N, 77.5W location that enables 1fT/rt-Hz noise after SpecLab noise cancellation, that a setup of that description could detect (3dB SNR) Stefan's 8270 Hz carrier in ~ 10 hours? If you think that a long-integration-time capture near that location might be worthwhile in the future I will make some calibrated noise measurements this week or next. Low noise collection for intervals up to 48 hours is fairly convenient in that area. Data from last year at that location suggests ~5fT/rt-Hz using SpecLab Noiseblanker with un-optimized settings and a bandpass-mismatched antenna. If the 5fT/rt-Hz noise estimate is valid, noise could be 1-2fT/rt-Hz with the correct antenna, perhaps better in winter with optimized Noiseblanker settings. Would the above be useful on an as-needed basis? Or does the Forest VA grabber suffice? 73, Jim AA5BW -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Paul Nicholson Sent: Tuesday, January 17, 2017 3:11 PM To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: Carrier on 8270 Hz > Since 19 UTC i'm running about 600 mA antenna current on 8270 Hz. Wow, what a signal! Over 0.7 fT, I haven't seen a signal this strong on VLF since your kite experiments several years ago. -- Paul Nicholson --