Return-Path: X-Spam-DCC: paranoid 1170; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,NO_REAL_NAME autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id sBJHU6eB031709 for ; Fri, 19 Dec 2014 18:30:06 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y21HC-0005r2-Cj for rs_out_1@blacksheep.org; Fri, 19 Dec 2014 17:23:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y21HC-0005qt-43 for rsgb_lf_group@blacksheep.org; Fri, 19 Dec 2014 17:23:42 +0000 Received: from resqmta-ch2-02v.sys.comcast.net ([69.252.207.34]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-SHA:256) (Exim 4.84) (envelope-from ) id 1Y21H9-0002Kc-Ut for rsgb_lf_group@blacksheep.org; Fri, 19 Dec 2014 17:23:41 +0000 Received: from resomta-ch2-17v.sys.comcast.net ([69.252.207.113]) by resqmta-ch2-02v.sys.comcast.net with comcast id VVPP1p0012TL4Rh01VPdt3; Fri, 19 Dec 2014 17:23:37 +0000 Received: from Owner ([69.143.126.216]) by resomta-ch2-17v.sys.comcast.net with comcast id VVPc1p00G4gFcuV01VPcJq; Fri, 19 Dec 2014 17:23:37 +0000 X-DKIM-Result: Domain=comcast.net Result=Signature OK From: To: References: <549322C4.8000103@abelian.org> <5493404D.2000209@abelian.org> <052f01d01b0b$95c573c0$c1505b40$@comcast.net> <54935193.6030307@abelian.org> In-Reply-To: <54935193.6030307@abelian.org> Date: Fri, 19 Dec 2014 12:23:24 -0500 Message-ID: <058401d01bb0$7f0e44e0$7d2acea0$@comcast.net> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 14.0 Thread-Index: AQGc0HblSdkgZdmu5fJfrOtFc9AYJwF4+8IbAmEukFUA5J1V2ZzWriLA Content-Language: en-us DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20140121; t=1419009817; bh=H7y4eSkOUlMgkfLYIsTvRwhcjK8Vh5FnfbfKcUY8Hxw=; h=Received:Received:From:To:Subject:Date:Message-ID:MIME-Version: Content-Type; b=Mj4pcCuiGw7aOLvynlydk1GCLxjLodpL2Y37lq1igA+1gT2LAWOTvqUJv86zptDhc 9asI1L9ZdJdyvgS9jW1lxpNb2HjiUwe1kGIiGi6CPj6kY6sn7G02aaGh0rnrtHeZJk roJU3RRFhWv1zaxTNTwPED00JCI0HTaAaksqQWG8QkYsUwKbsNbzUv4JbuFtPBOBMW YdoPkIur3OsR5LuA2q+T7ymbi8gLl2nyBtVxCKcog/6IbKQeDAi7rwsku12/q2kAzK 9BYPhLuBkCm9Vk5jb2SZwLES3RKC9+qLce5awVv9k+SLf1O8R3QPxDgz7upl16Qukm VPVJQO1N900KQ== X-Scan-Signature: 6ffbd2c9950b634d6cc91f9565b01a8b Subject: RE: VLF: W4DEX to IK1QFK at 8822Hz Content-Type: text/plain; charset="us-ascii" 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1521 Paul, Impressive (low) system noise and agreement of Example 6 model with results. 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: Thursday, December 18, 2014 5:14 PM To: rsgb_lf_group@blacksheep.org Subject: Re: VLF: W4DEX to IK1QFK at 8822Hz > 11dB @ 0.12fT and 278 uHz implies approximately > 2fT/root-Hz aggregate noise? That's about right for a quiet night. That's after sferic blanking - before the blanker the background is some 20dB or more higher. The system noise floor is about 0.2 fT RMS in 1Hz. There happens to be a fairly accurate model of the antenna and receiver in example 6 of this program http://abelian.org/lcnetgen/ which I've been working on for a few months. LCnetgen may be handy for modelling LF/VLF antennas and coils. -- Paul Nicholson http://abelian.org/ --