Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id w06Ip3FI014425 for ; Sat, 6 Jan 2018 19:51:06 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eXtTs-0004Cf-6Z for rs_out_1@blacksheep.org; Sat, 06 Jan 2018 18:46:08 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eXtTo-0004CW-RY for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 18:46:04 +0000 Received: from mout1.freenet.de ([2001:748:100:40::2:3]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eXtTl-0002PE-EX for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 18:46:03 +0000 Received: from [195.4.92.140] (helo=mjail0.freenet.de) by mout1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.89 #1) id 1eXtTh-0005Bw-SD for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:45:57 +0100 Received: from [::1] (port=43542 helo=mjail0.freenet.de) by mjail0.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.89 #1) id 1eXtTh-0000AR-PG for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:45:57 +0100 Received: from mx4.freenet.de ([195.4.92.14]:35968) by mjail0.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.89 #1) id 1eXtRc-0006BN-M0 for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:43:48 +0100 Received: from dslb-088-071-238-175.088.071.pools.vodafone-ip.de ([88.71.238.175]:51505 helo=[192.168.178.26]) by mx4.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (port 587) (Exim 4.89 #1) id 1eXtRc-0005CP-G9 for rsgb_lf_group@blacksheep.org; Sat, 06 Jan 2018 19:43:48 +0100 To: rsgb_lf_group@blacksheep.org References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <702563436.93043973.1515019639560.JavaMail.zimbra@shaw.ca> <1117988114.95527491.1515092735528.JavaMail.zimbra@shaw.ca> <1944603203.95803107.1515098735558.JavaMail.zimbra@shaw.ca> <1178238001.101520499.1515262806879.JavaMail.zimbra@shaw.ca> From: =?UTF-8?Q?Wolfgang_B=c3=bcscher?= Message-ID: Date: Sat, 6 Jan 2018 19:42:14 +0100 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <1178238001.101520499.1515262806879.JavaMail.zimbra@shaw.ca> X-Originated-At: 88.71.238.175!51505 X-Spam-Score: -0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Hello Jack and all, you wrote: >It comes back to using something like SL with its QRSS capabilities. I wish I had a good file that worked at 8720kHz for QRSS600 as an example. This would be a good start if nothing else. < [...] Content analysis details: (-0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (dl4yhf[at]freenet.de) X-Scan-Signature: fc152e7304849b9a177649b85aea9f41 Subject: SL settings for QRSS (was: Re: LF: RE: Todmorden receiver by Jack) Content-Type: text/plain; charset=utf-8; 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 Hello Jack and all, you wrote: >It comes back to using something like SL with its QRSS capabilities. I wish I had a good file that worked at 8720kHz for QRSS600 as an example. This would be a good start if nothing else. < It's not that difficult to set up. The key point in SL to get into the microhertz-resolution is the decimation (of the sampling rate), along with complex frequency to have a complex FFT spanning just a few Hz around the "frequency of interest". The effect is similar as a super-long FFT (concerning the frequency bin width, and thus the "gain"). I think on Stefan (DK7FC's) site you can find some configuration files for QRSSS. Back in the "old days" of extremely slow Morse, I wrote this short how-to (for Spectrum Lab): http://www.qsl.net/dl4yhf/speclab/qrss_quickstart.htm (it shows how to pick one of the VLF transmitters to stabilize the soundcard's sampling rate, a bit out of fashion since good GPSes with sync output became available, but anyway..) To make the FFT window even longer / frequency bins even shorter than used in the default settings, use the option 'complex input for the FFT with internal frequency shift', as shown at http://www.qsl.net/dl4yhf/speclab/settings.htm#fft_size And, last not least, there an explanation of FFT length, decimation, windowing functions, resulting resolution / effective receiver bandwidth versus dynamic range, etc: http://www.qsl.net/dl4yhf/speclab/fftinfo.htm All the best, Wolf DL4YHF