Return-Path: Received: from rly-mb02.mx.aol.com (rly-mb02.mail.aol.com [172.21.131.155]) by air-mb02.mail.aol.com (v125.7) with ESMTP id MAILINMB023-cef4ae5f58c18c; Mon, 26 Oct 2009 15:16:32 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mb02.mx.aol.com (v125.7) with ESMTP id MAILRELAYINMB023-cef4ae5f58c18c; Mon, 26 Oct 2009 15:16:30 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1N2V1p-0006J4-CJ for rs_out_1@blacksheep.org; Mon, 26 Oct 2009 19:14:53 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1N2V1o-0006Iv-Va for rsgb_lf_group@blacksheep.org; Mon, 26 Oct 2009 19:14:53 +0000 Received: from c2bthomr14.btconnect.com ([213.123.20.132]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1N2V1V-0002si-9x for rsgb_lf_group@blacksheep.org; Mon, 26 Oct 2009 19:14:41 +0000 Received: from [192.168.1.64] (host86-158-35-197.range86-158.btcentralplus.com [86.158.35.197]) by c2bthomr14.btconnect.com with ESMTP id EIU02051; Mon, 26 Oct 2009 19:14:27 GMT Message-ID: <4AE5F516.2080503@btconnect.com> Date: Mon, 26 Oct 2009 19:14:30 +0000 From: Richard Newstead User-Agent: Thunderbird 2.0.0.23 (Windows/20090812) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <9afca2640910240855l4ad81f57sc7247c1c78a1365f@mail.gmail.com> <14E9228C113E44A6A66C5DEF8A144F28@AGB> In-Reply-To: X-Junkmail-Status: score=10/50, host=c2bthomr14.btconnect.com X-Junkmail-SD-Raw: score=unknown, refid=str=0001.0A0B0208.4AE5F513.035B,ss=1,fgs=0, ip=0.0.0.0, so=2009-07-20 21:54:04, dmn=5.7.1/2009-08-27, mode=single engine X-Junkmail-IWF: false X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: 500kHz 1mW WSPR beaconing Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none autolearn=no version=2.63 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-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Andy Talbot wrote: > --- > There is no 'chance' involved. The strong source coding employed in > all the WSJT modes to get the number of bits to be encoded down to an > absolute minimum, before proper error correction is added, removes all > wasted redundancy in the original callsign format. This has the > result that most _truly random_ bit patterns will therefore generate a > valid looking callsign. Its an artefact of efficient coding. > > Andy Thanks for the explanation. It is interesting to see WSPR decoding things such as CQ and a plausible looking callsign and today mine has a message "de 9y4/mk0whx rrr". All these on 500kHz. I notice that your beacon is detectable all day here. 73 Richard G3CWI