Return-Path: X-Spam-DCC: paranoid 1002; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00 autolearn=unavailable version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id sB2HYbYb006134 for ; Tue, 2 Dec 2014 18:34:37 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XvrGI-0000Kq-GN for rs_out_1@blacksheep.org; Tue, 02 Dec 2014 17:29:18 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XvrGI-0000Kh-7V for rsgb_lf_group@blacksheep.org; Tue, 02 Dec 2014 17:29:18 +0000 Received: from smtpout5.wanadoo.co.uk ([80.12.242.80] helo=smtpout.wanadoo.co.uk) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1XvrGG-0003Eh-G6 for rsgb_lf_group@blacksheep.org; Tue, 02 Dec 2014 17:29:17 +0000 Received: from AGB ([95.145.230.171]) by mwinf5d61 with ME id NhVC1p00V3iXv7B03hVC8n; Tue, 02 Dec 2014 18:29:15 +0100 X-ME-Helo: AGB X-ME-Date: Tue, 02 Dec 2014 18:29:15 +0100 X-ME-IP: 95.145.230.171 Message-ID: <2C04F77BFB524BE38D952DD2C8D5AD7E@AGB> From: "Graham" To: References: <547C65A9.13517.C38DF3@mike.dennison.ntlworld.com> In-Reply-To: Date: Tue, 2 Dec 2014 17:29:12 -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-Scan-Signature: 9ca91679b330d65f05d707c2d2b164fe Subject: Re: LF: VO1NA on 477kHz last night Content-Type: text/plain; format=flowed; charset="iso-8859-15"; reply-type=response Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1394 suffering from static interference Not as such Roelof By using Manchester coding , each of the 250 ish bits are self sycn , so its not possible to 'loose lock' this coupled with non-linear routines in the dsp give a good level of compression / resistance to static and being only 1 frequency , Doppler has minimal effect as well The decode process is similar to a Jig saw , once all possible bits of a TX sequence [ or 40 + % of them ] have been observed , then the decoder re-assembles the tx along the time line , being a 'data mode' what is recovered is the original pay-load , but , due to using algorithms to compress the call sign , false decodes , will have the same format as a call , but not a valid one , I noticed last night, high background noise , and Joe's signal dropped at one point , that may of been a Ae change ? 73-G. -------------------------------------------------- From: "Roelof Bakker" Sent: Tuesday, December 02, 2014 11:11 AM To: Subject: Re: LF: VO1NA on 477kHz last night > Hello Joe, > > I am running a PERSEUS overnight spectrum recording from 200 - 600 kHz > each night. > So, it is no problem to run OP8 on 477 kHz whilst these recordings are > running. > > Looking at last night's recording for T/A signals, propagation has been > better. > There was also a fair amount of static. > However, I don't know if OP8 is suffering from static interference or not. > This is what I found: > > 02-12-2014 05:54 477 VO1NA de PA0RDT Op8 -31 dB F:11% in Middelburg > 02-12-2014 05:24 477 VO1NA de PA0RDT Op8 -25 dB F:12% in Middelburg > 02-12-2014 04:54 477 VO1NA de PA0RDT Op8 -29 dB F:11% in Middelburg > 02-12-2014 04:24 477 VO1NA de PA0RDT Op8 -28 dB F:16% in Middelburg > 02-12-2014 02:24 477 VO1NA de PA0RDT Op8 -31 dB F:16% in Middelburg > 02-12-2014 01:54 477 VO1NA de PA0RDT Op8 -31 dB F:15% in Middelburg > 02-12-2014 00:54 477 VO1NA de PA0RDT Op8 -27 dB F:17% in Middelburg > 02-12-2014 00:24 477 VO1NA de PA0RDT Op8 -33 dB F:9% in Middelburg > 01-12-2014 23:54 477 VO1NA de PA0RDT Op8 -29 dB F:15% in Middelburg > > Best regards, > Roelof > ===================================================================== > From: Roelof Bakker, pa0rdt > Location: Middelburg, Zealand SW Netherlands, 51 30 02 N, 03 36 02 E > Locator: JO11tm > Receiver: PERSEUS, MODE USB, bandwidth 2.4 kHz > Aerial: pa0rdt-mini-whip, 5 metre up in a hawthorn tree. > ====================================================================== >