Return-Path: X-Spam-DCC: paranoid 1102; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 tAPKkOdn023537 for ; Wed, 25 Nov 2015 21:46:24 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a1guN-0002Gx-Va for rs_out_1@blacksheep.org; Wed, 25 Nov 2015 20:43:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a1guN-0002Go-NJ for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 20:43:19 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a1gtQ-0005NR-Bf for rsgb_lf_group@blacksheep.org; Wed, 25 Nov 2015 20:43:18 +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 9BFA53273A5 for ; Wed, 25 Nov 2015 20:33:15 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id D499228A014F for ; Wed, 25 Nov 2015 20:42:03 +0000 (UTC) Message-ID: <56561D1B.7080201@abelian.org> Date: Wed, 25 Nov 2015 20:42:03 +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: <8D2F5CEE86A9058-14FC-16B19E@webmail-vm002.sysops.aol.com> <2062584.LhDGbAj14s@zv5000> In-Reply-To: <2062584.LhDGbAj14s@zv5000> X-Scan-Signature: 64437c466041e93ffedda7fb96b22b71 Subject: Re: LF: EbNaut and The Cat / Take 3 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: 5319 Markus wrote: > Maybe it makes sense to assume a 50% error rate for the > statistics, more equivalent to a loss of signal Good idea, I'll try it. I wouldn't like to stand up and justify that to a professor but it could do better than the alternatives - at least BER will always be below 50%. There will still be problems though, eg 10% of a transmission received but BER = 40% implying that 60% of symbols were correct even though they weren't received. > Only problem is that the return path seems so much harder At VLF the east-to-west is about 20dB harder than west-to-east. Is there similar anisotropy at LF? I guess much less, if any. We're running out of stations equipped for coherent! It doesn't take long to exhaust the permutations. And what are the limits at LF? How far do amateur signals go? For that matter, how far does this mailing list reach? How to interest more experimenters... away from Europe and North America. Was reading about lowFER, severe limits on antennas and input power. Now that could be interesting. Do lowFER signals reach Europe? Lacking DX stations, the only option is some serious QRP. Can we think of something interesting enough to drag Andy away from his GUI? -- Paul Nicholson --