Return-Path: X-Spam-DCC: paranoid 104; 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,SPF_PASS 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 u4IIBmGc009040 for ; Wed, 18 May 2016 20:11:48 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1b35sz-0001uG-Bf for rs_out_1@blacksheep.org; Wed, 18 May 2016 19:07:57 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1b35sy-0001u7-WA for rsgb_lf_group@blacksheep.org; Wed, 18 May 2016 19:07:56 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.87) (envelope-from ) id 1b35sx-00068j-Ew for rsgb_lf_group@blacksheep.org; Wed, 18 May 2016 19:07:55 +0100 Received: from pn.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 4C8B2227AC5 for ; Wed, 18 May 2016 19:06:16 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 9935E4000D7 for ; Wed, 18 May 2016 18:07:53 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> From: Paul Nicholson Message-ID: <573CAF79.9040701@abelian.org> Date: Wed, 18 May 2016 18:07:53 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: <154c32c4dba-373a-24653@webprd-m58.mail.aol.com> X-Scan-Signature: e09cca6d8e44a91eadbdfb3e1b8aec09 Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz 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 2.56 on 10.1.3.11 Status: O X-Status: X-Keywords: X-UID: 8120 Stefan wrote: > f = 6470.00000 Hz > Start time: 16.05.2016 21:00:02 UTC > Symbol length: 100 s > Characters: 20 > CRC 16 > Coding 8K19A I wasn't able to decode the 18 char message. Thanks to Markus for the sneaky decode, I was able to reverse the modulation to see the signal was 13.6dB in 8.8 uHz. That puts Eb/N0 at about -6.5 dB. Strange, I was expecting a better result because the background noise was quite low throughout the message. Tomorrow I'll have a closer look to try and see if propagation is upsetting the phase. -- Paul Nicholson --