Return-Path: Received: from rly-de03.mx.aol.com (rly-de03.mail.aol.com [172.19.170.139]) by air-de07.mail.aol.com (v121_r5.5) with ESMTP id MAILINDE073-4c249a0743e31c; Sat, 21 Feb 2009 16:38:11 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-de03.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDE033-4c249a0743e31c; Sat, 21 Feb 2009 16:38:09 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1LazXT-0002MG-Uw for rs_out_1@blacksheep.org; Sat, 21 Feb 2009 21:37:35 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1LazXT-0002M7-GP for rsgb_lf_group@blacksheep.org; Sat, 21 Feb 2009 21:37:35 +0000 Received: from mail-fx0-f174.google.com ([209.85.220.174]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1LazXS-000232-SE for rsgb_lf_group@blacksheep.org; Sat, 21 Feb 2009 21:37:35 +0000 Received: by fxm22 with SMTP id 22so930202fxm.4 for ; Sat, 21 Feb 2009 13:37:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:mime-version:received:date:message-id:subject :from:to:content-type:content-transfer-encoding; bh=IOd9FP0poDGMOuWcrTnWPMlrRMtBcJ+3De1xKg89uuE=; b=QThGFtNT5RC56BjkDLCxyqVEUHSx3v/THufYTksPqZuFxcAkaFXiOrFppptNJdiTXX L3j43a9W1OcLN2s4o9aj0v6FabOhRfAtaGh5UPE+bISkPY4OABSPnbYPZvTtFzsIDx17 BZiq94mF4qARFTzg0Tr6Z3KFCBSgm5nKehwGw= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type :content-transfer-encoding; b=iUV0CjXhmVOUoxtTjbfkq3hmFk4hL36YmvSALLf+Rnu9BomXuY6x0ODw0kHqiMAHVU WD6sYcTHZcI9lgpe3aedby9Y4U3NpRjcflSx6hp0+FSJ2EjvxWoQ8wgKso6/KcsAwrY6 7hBeIgri2JYfcLqqjKIl9z6zveObreHqoFnTA= MIME-Version: 1.0 Received: by 10.223.114.208 with SMTP id f16mr3046749faq.91.1235252248677; Sat, 21 Feb 2009 13:37:28 -0800 (PST) Date: Sat, 21 Feb 2009 21:37:28 +0000 Message-ID: From: Andy Talbot To: rsgb_lf_group@blacksheep.org X-Karma: unknown: DomainKey-Status: good (testing) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Ultra pico-low-power WSPR beacon Content-Type: text/plain; charset=ISO-8859-1 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-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d285.2 ; domain : googlemail.com DKIM : fail X-Mailer: Unknown (No Version) Just for a bit of novelty, I'm running probably the lowest power WSPR signal seen on this band. Frequency 503.87kHz (set the usual USB carrier 502.4) RF power is -2dBm, so ERP is in the region of -27dBm. Duty cycle 33% (well, actually, 34.375%, but who's counting) Judging by some of the WSPR reports on my signal when runing 100 Watts in the past, a few local stations may just be able to decode it. As for PN sequences, I admited defeat and just wrote down a series of ones and zeros then played with them till they looked right and had the correct numbers of each in a 32 bit pattern (which is why 33% and 20% duty cycle values aren't spot-on) On the assumptuin that its not random at all, why try to generate other than by eye? Interesting to know Joe had a similar headache over this issue, Scott. Clearly it isn't a 'mountain out of a molehill' problem after all. Andy G4JNT www.g4jnt.com