Return-Path: Received: from rly-me07.mx.aol.com (rly-me07.mail.aol.com [172.20.83.41]) by air-me04.mail.aol.com (v125.7) with ESMTP id MAILINME042-9c84ab28627ce; Thu, 17 Sep 2009 14:55:45 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-me07.mx.aol.com (v125.7) with ESMTP id MAILRELAYINME074-9c84ab28627ce; Thu, 17 Sep 2009 14:55:36 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1MoM8H-00012k-3d for rs_out_1@blacksheep.org; Thu, 17 Sep 2009 19:55:05 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1MoM8G-00012b-OL for rsgb_lf_group@blacksheep.org; Thu, 17 Sep 2009 19:55:04 +0100 Received: from sighthound.demon.co.uk ([80.177.174.126]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1MoM79-0004vC-IP for rsgb_lf_group@blacksheep.org; Thu, 17 Sep 2009 19:53:56 +0100 Received: from [10.218.2.8] (lurcher.twatt.home [10.218.2.8]) by deerhound.twatt.home (Postfix) with ESMTP id 6090A3B52F for ; Thu, 17 Sep 2009 18:54:55 +0000 (UTC) Message-ID: <4AB285FF.5090409@sighthound.demon.co.uk> Date: Thu, 17 Sep 2009 18:54:55 +0000 From: John P-G User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <9afca2640909170123m5b55c351obbeb512476e39fbb@mail.gmail.com> <4AB1FDBC.28794.CE89A8@dave.davesergeant.com> In-Reply-To: <4AB1FDBC.28794.CE89A8@dave.davesergeant.com> X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: WSPR threshold reports 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) Dave Sergeant wrote: > One point is that with the K2 you cannot set a narrow filter at 1.5kHz > (a limitation of the tuning range of its IF BFO). I am sure if you used > such a narrow receive filter the results would be spectacularly better, > but I am stuck with the SSB filter. Dave, LF I'm not sure this would really be a big improvement. I guess the only benefit one would gain is if there was a strong signal within the receiver's SSB passband, but outside the WSPR 200Hz region, that was upsetting the receiver's AGC. If this isn't the case then the DSP filtering of WSPR itself should suffice. After all WSPR is capable of discriminating between adjacent WSPR transmissions <10Hz apart. I wouldn't worry about the lack of a narrow IF filter in most circumstances, especially on 500kHz. 40m might be another story! John -- http://gm4slv.blogspot.com Clousta, Shetland IP90gg