Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-df02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 1841C3800009A; Tue, 20 Nov 2012 18:37:55 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TaxN2-0007Za-LI for rs_out_1@blacksheep.org; Tue, 20 Nov 2012 23:36:48 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TaxN2-0007ZR-8C for rsgb_lf_group@blacksheep.org; Tue, 20 Nov 2012 23:36:48 +0000 Received: from smtpout1.wanadoo.co.uk ([80.12.242.29] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1TaxN0-0007c4-BB for rsgb_lf_group@blacksheep.org; Tue, 20 Nov 2012 23:36:47 +0000 Received: from AGB ([2.26.46.86]) by mwinf5d08 with ME id Rzci1k00C1rZoJA03zciqz; Wed, 21 Nov 2012 00:36:45 +0100 Message-ID: From: "Graham" To: References: In-Reply-To: Date: Tue, 20 Nov 2012 23:36:42 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: These are sideband(s) wspr is (supposed) to be a qrppp system, but with large signals then imd / synth noise / spurs will also decode if there above the decoder threshold ..one of the problems associated with data transmission as opposed to non complex cw - ook systems .. where a pure carrier is keyed [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [80.12.242.29 listed in list.dnswl.org] X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: Re: LF: strange "duplication" of DK7FC WSPR spots Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response 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=0.1 required=5.0 tests=MISSING_OUTLOOK_NAME 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-global-disposition: G x-aol-sid: 3039ac1d40d650ac14536f1b X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none These are sideband(s) wspr is (supposed) to be a qrppp system, but with large signals then imd / synth noise / spurs will also decode if there above the decoder threshold ..one of the problems associated with data transmission as opposed to non complex cw - ook systems .. where a pure carrier is keyed the transmitter path has to be many db's better than for normal voice ... may be from the sound card , as psu type problems usually result in +/- sidebands x2 mains frequency , but if its switch mode , then the relationship is not predictable Unlikely to be the Rx + Ae as wspr is a mfsk system , If the agc is set 'fast' then psk31 will show a higher imd due to envelope compression , but will not alter wspr or ros-mf or hf G.. -------------------------------------------------- From: "IK1WVQ Mauro" Sent: Tuesday, November 20, 2012 9:58 PM To: Subject: LF: strange "duplication" of DK7FC WSPR spots > Hi to all, > > I see this strange behaviour of the DK7FC WSPR spots: > > 2136 -24 6.5 0.475614 0 DK7FC JN49 30 > 2136 1 6.5 0.475641 0 DK7FC JN49 30 > 2142 -27 6.5 0.475614 0 DK7FC JN49 30 > 2142 0 6.5 0.475641 0 DK7FC JN49 30 > 2148 -28 6.5 0.475614 0 DK7FC JN49 30 > 2148 -2 6.5 0.475641 0 DK7FC JN49 30 > > > At each time slot I receive 2 spots, one strong (0 dB), and the other weak > (-27dB) .. > > Is this an artifact of my receiver (RACALL 1792, ant. PA0RDT) ??? > > 73 de Mauro IK1WVQ > >