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=-0.8 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO, RATWARE_GECKO_BUILD 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 sBIMJhSh029570 for ; Thu, 18 Dec 2014 23:19:45 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y1jKJ-0003lk-3S for rs_out_1@blacksheep.org; Thu, 18 Dec 2014 22:13:43 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y1jKI-0003lb-FN for rsgb_lf_group@blacksheep.org; Thu, 18 Dec 2014 22:13:42 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y1jKG-0006S1-Kx for rsgb_lf_group@blacksheep.org; Thu, 18 Dec 2014 22:13:41 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 1DE3C3273E6 for ; Thu, 18 Dec 2014 22:12:41 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 31CAA28A12E0 for ; Thu, 18 Dec 2014 22:13:39 +0000 (UTC) Message-ID: <54935193.6030307@abelian.org> Date: Thu, 18 Dec 2014 22:13:39 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <549322C4.8000103@abelian.org> <5493404D.2000209@abelian.org> <052f01d01b0b$95c573c0$c1505b40$@comcast.net> In-Reply-To: <052f01d01b0b$95c573c0$c1505b40$@comcast.net> X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: VLF: W4DEX to IK1QFK at 8822Hz Content-Type: text/plain; charset=ISO-8859-1; 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1518 > 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/ --