X-GM-THRID: 1215974039374463637 X-Gmail-Labels: rsgb lf X-Gmail-Received: 0450c43dd95a063a3ab23aca95a7a0225a0281ca Delivered-To: daveyxm@gmail.com Received: by 10.78.205.5 with SMTP id c5cs26768hug; Thu, 5 Oct 2006 04:09:39 -0700 (PDT) Received: by 10.67.93.6 with SMTP id v6mr1772901ugl; Thu, 05 Oct 2006 04:09:39 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id b23si694821ugd.2006.10.05.04.09.38; Thu, 05 Oct 2006 04:09:39 -0700 (PDT) Received-SPF: neutral (google.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1GVR29-0002tG-CE for rs_out_1@blacksheep.org; Thu, 05 Oct 2006 12:04:57 +0100 Received: from [193.82.59.130] (helo=relay2.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GVR28-0002t7-Nq for rsgb_lf_group@blacksheep.org; Thu, 05 Oct 2006 12:04:56 +0100 Received: from mk-ironport-3.mail.uk.tiscali.com ([212.74.114.23]) by relay2.thorcom.net with esmtp (Exim 4.51) id 1GVR24-000625-Gf for rsgb_lf_group@blacksheep.org; Thu, 05 Oct 2006 12:04:56 +0100 Received: from mk-smarthost-3.mail.uk.tiscali.com ([212.74.114.39]) by mk-ironport-3.mail.uk.tiscali.com with ESMTP; 05 Oct 2006 11:52:34 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AQAAAIiDJEWCPjaJGgIHBAoHBh0 Received: from 88-106-97-112.dynamic.dsl.as9105.com ([88.106.97.112]:3925 helo=tcs01) by mk-smarthost-3.mail.uk.tiscali.com with smtp (Exim 4.30) id 1GVQq9-0004b3-If for rsgb_lf_group@blacksheep.org; Thu, 05 Oct 2006 10:52:33 +0000 From: "Gary - G4WGT" To: Date: Thu, 5 Oct 2006 11:52:44 +0100 Message-ID: MIME-Version: 1.0 X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 In-Reply-To: <8C8B67B273EF16D-1348-12E@FWM-D41.sysops.aol.com> Importance: Normal X-Spam-Score: -0.6 (/) X-Spam-Report: autolearn=disabled,AWL=-0.650,HTML_40_50=0.086,HTML_MESSAGE=0.001 Subject: RE: LF: Strange signal 500khz Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C6E874.C502C020" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_FONTCOLOR_BLUE, HTML_MESSAGE 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 Status: O X-Status: X-Keywords: X-UID: 4479 This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C6E874.C502C020 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Hi Markus, Not so :-) the TV was continuously on one channel for 2 programs = whilst I monitored, I watched 500KHz last night deliberately around the = time my wife switched the set on therefore proving it was my own TV. I = believe that the stepping effect is probably due to the "Freeview" = digi-box because the TV is an older analogue model & I would expect a = steady (ish) interference with no prominent stepping. I will do some = tests with & without the digi-box. I do always see a continuous weaker line near the same point which was = also visible in my previous attachment which is not due to the TV being = in standby as we always switch the set off by the mains on/off switch, = the line could be generated by one of my other electronic items which = are always in stanby mode as they do not have a mains power switch. It seems that Alan's comments about TV interference at that frequency = were correct. 73 Gary - G4WGT. -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org = [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of = markusvester@aol.com Sent: 05 October 2006 10:53 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Strange signal 500khz Gary, interesting - one of your family members seems to be switching channels = rapidly ;-) During my LORAN monitoring, I often saw a grid pattern which didn't = average out in 5 minutes or longer integration times. It appeared only = on certain chains, having group repetition intervals which were = multiples of 40 (i.e. 0.8 ms). The explanation turned out to be a weak carrier at 93.750 kHz (6x line = scan) from my neighbour's TV. This became visible only when she was = watching either "ZDF" which used to have their line rate sysnchronized = to UTC, or "3sat" which showed a small variable slant due to = geostationary satellite residual Doppler. 73 de Markus, DF6NM ------=_NextPart_000_001B_01C6E874.C502C020 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF
Hi=20 Markus,
 
Not so =20 :-)  the TV was continuously on one channel for 2 programs whilst I = monitored, I watched 500KHz last night deliberately around the time my = wife=20 switched the set on therefore proving it was my own TV. I believe that = the=20 stepping effect is probably due to the "Freeview" digi-box because = the TV=20 is an older analogue model & I would expect a steady = (ish) interference=20 with no prominent stepping. I will do some tests with & without the=20 digi-box.
 
I do always=20 see a continuous weaker line near the same point which was also visible = in my=20 previous attachment which is not due to the TV being in standby as we = always=20 switch the set off by the mains on/off switch, the line could be = generated by=20 one of my other electronic items which are always in stanby mode as = they do=20 not have a mains power switch.
 
It seems that=20 Alan's comments about TV interference at that frequency were=20 correct.
 
73
 
Gary -=20 G4WGT.
 
 
-----Original Message-----
From:=20 owner-rsgb_lf_group@blacksheep.org=20 [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of=20 markusvester@aol.com
Sent: 05 October 2006 = 10:53
To:=20 rsgb_lf_group@blacksheep.org
Subject: Re: LF: Strange signal=20 500khz

Gary,
 
interesting - one of your family members seems to be switching = channels=20 rapidly ;-)
 
During my LORAN monitoring, I often saw a grid pattern which didn't = average=20 out in 5 minutes or longer integration times. It appeared only on=20 certain chains, having group repetition intervals which = were multiples=20 of 40 (i.e. 0.8 ms).
 
The explanation turned out to be a weak carrier at 93.750 kHz (6x = line=20 scan) from my neighbour's TV. This became visible only when = she was=20 watching either "ZDF" which used to have their line rate = sysnchronized to=20 UTC, or "3sat" which showed a small variable slant due to = geostationary satellite residual Doppler.
 
73 de Markus, DF6NM

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