Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk05.r1000.mx.aol.com (Internet Inbound) with ESMTP id A1BA1380000B2; Wed, 20 Mar 2013 09:39:28 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UIIjK-00055l-JC for rs_out_1@blacksheep.org; Wed, 20 Mar 2013 13:06:58 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UIIjK-00055c-5n for rsgb_lf_group@blacksheep.org; Wed, 20 Mar 2013 13:06:58 +0000 Received: from mout.gmx.net ([212.227.17.20]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UIIjI-0001tD-I2 for rsgb_lf_group@blacksheep.org; Wed, 20 Mar 2013 13:06:57 +0000 Received: from mailout-de.gmx.net ([10.1.76.30]) by mrigmx.server.lan (mrigmx001) with ESMTP (Nemesis) id 0MRQbm-1U7LQB0TrU-00ScEi for =?utf-8?q?;?= Wed, 20 Mar 2013 14:06:35 +0100 Received: (qmail invoked by alias); 20 Mar 2013 13:06:34 -0000 Received: from p4FEDB534.dip.t-dialin.net (EHLO Clemens0811) [79.237.181.52] by mail.gmx.net (mp030) with SMTP; 20 Mar 2013 14:06:34 +0100 X-Authenticated: #17214767 X-Provags-ID: V01U2FsdGVkX1+EJBoPgcOEUAtgW/GzbYyCqyrfdL+UQk67j0iGub ZsP4iBjgClaH+d From: "Clemens Paul" To: References: <3309.377f234c.3e76743b@aol.com> <005101ce23fa$952aa840$6d01a8c0@DELL4> <173B435C07644894A07F177CB5DC86D5@Clemens0811> In-Reply-To: Date: Wed, 20 Mar 2013 14:06:33 +0100 Message-ID: MIME-Version: 1.0 X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.17609 Thread-Index: Ac4k5o738CWs/EiGSaCzJ1ospQAwewAg90Hg X-Y-GMX-Trusted: 0 X-Spam-Score: -2.5 (--) 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: Hi Roelof, >Instead of the original bandwidth of 540 Hz, I used a filter >bandwidth of 2400 Hz. >This time WG2XJM produced a SNR of -28, whilst with a >bandwidth of 540 Hz the SNR was -33. That's strange.I would have expected the "better" SNR with the 540Hz filter. Just for fun try a 100Hz or even 50Hz BW. I've seen "improvements" in indicated SNR up to 15dB with Perseus. [...] Content analysis details: (-2.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [212.227.17.20 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (cpaul[at]gmx.net) -0.0 SPF_PASS SPF: sender matches SPF record -2.5 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 086f3faad0220c9ae57a7913e711a86d Subject: RE: LF: RE: Re: WSPR -2 SNR Content-Type: text/plain; charset="US-ASCII" 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-global-disposition: G x-aol-sid: 3039ac1db4095149bc0f2dcd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Hi Roelof, >Instead of the original bandwidth of 540 Hz, I used a filter >bandwidth of 2400 Hz. >This time WG2XJM produced a SNR of -28, whilst with a >bandwidth of 540 Hz the SNR was -33. That's strange.I would have expected the "better" SNR with the 540Hz filter. Just for fun try a 100Hz or even 50Hz BW. I've seen "improvements" in indicated SNR up to 15dB with Perseus. >The reason that SNR's below -30 dB are rare, might be that in >conventional receivers/transceivers it often is not possible >to select a 500 Hz filter in USB mode and shift the passband >center 1700 Hz in regard to the >(suppressed) carrier. That's true. Only a few models could do that,e.g. my old TR-7 from 1978 could shift the passband in any BW in any mode in either direction (LSB/USB) extremely wide I guess something around +/- 4 or 5kHz. 73 Clemens DL4RAJ >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Roelof Bakker >Sent: Tuesday, March 19, 2013 10:12 PM >To: rsgb_lf_group@blacksheep.org >Subject: Re: LF: RE: Re: WSPR -2 SNR >