Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8CEF43800009F; Sun, 6 Jan 2013 14:46:58 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TrwAJ-0003CK-46 for rs_out_1@blacksheep.org; Sun, 06 Jan 2013 19:45:51 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TrwAI-0003CB-KZ for rsgb_lf_group@blacksheep.org; Sun, 06 Jan 2013 19:45:50 +0000 Received: from mx4.utsp.utwente.nl ([130.89.2.32] helo=mxpool.utwente.nl) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TrwAG-0002gt-RY for rsgb_lf_group@blacksheep.org; Sun, 06 Jan 2013 19:45:49 +0000 Received: from ewi1614.ewi.utwente.nl (utwks06146.ad.utwente.nl [130.89.13.213]) by mxpool.utwente.nl (8.13.8) with ESMTP id r06JjSWS024038; Sun, 6 Jan 2013 20:45:28 +0100 Received: by ewi1614.ewi.utwente.nl (Postfix, from userid 17643373) id D3E9A3C40838; Sun, 6 Jan 2013 20:45:27 +0100 (CET) Date: Sun, 6 Jan 2013 20:45:27 +0100 From: Pieter-Tjerk de Boer To: rsgb_lf_group@blacksheep.org Cc: rsgb_lf_group@yahoogroups.co.uk, peter.martinez@btinternet.com Message-ID: <20130106194527.GC20261@cs.utwente.nl> Mail-Followup-To: rsgb_lf_group@blacksheep.org, rsgb_lf_group@yahoogroups.co.uk, peter.martinez@btinternet.com References: <71BE51CFEE0D4821BF900184D78D2582@Black> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <71BE51CFEE0D4821BF900184D78D2582@Black> User-Agent: Mutt/1.5.20 (2009-06-14) X-MIME-Autoconverted: from 8bit to quoted-printable by mxpool.utwente.nl id r06JjSWS024038 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: On Sun, Jan 06, 2013 at 06:29:15PM +0100, Markus Vester wrote: > The same Czech programme is also transmitted from Topolná on 270 > kHz, so that one would more likely be the heater. Interestingly the > crossmodulation source is almost twice the frequency as the victim. Well > almost, but not exactly - so that I still can't think of a simple physical > mechanism to explain the asymmetry. [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: Re: Asymmetric Luxembourg Effect on HGA Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable 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: 3039ac1d600d50e9d4b14be7 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none On Sun, Jan 06, 2013 at 06:29:15PM +0100, Markus Vester wrote: > The same Czech programme is also transmitted from Topoln=E1 on 270 > kHz, so that one would more likely be the heater. Interestingly the > crossmodulation source is almost twice the frequency as the victim. Wel= l > almost, but not exactly - so that I still can't think of a simple physi= cal > mechanism to explain the asymmetry. If one modulates a carrier simultaneously in phase and amplitude (with the same audio signal), sidebands of the AM and the PM can (partially) cancel each other on one side of the carrier, while reinforcing each other on the other side. Thus, although one doesn't get a pure SSB signal, one could get asymmetry. Could this be the mechanism here; in other words, can ionospheric heating produce both and amplitude and phase modulation? 73, Pieter-Tjerk, PA3FWM