X-GM-THRID: 1215974039374463637 X-Gmail-Labels: rsgb lf X-Gmail-Received: fbe73dd86d63e96ad70bc28b4c9613d166ea06f6 Delivered-To: daveyxm@gmail.com Received: by 10.78.205.5 with SMTP id c5cs25616hug; Thu, 5 Oct 2006 03:00:00 -0700 (PDT) Received: by 10.67.101.8 with SMTP id d8mr1702251ugm; Thu, 05 Oct 2006 03:00:00 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.google.com with ESMTP id u1si622679uge.2006.10.05.02.59.59; Thu, 05 Oct 2006 03:00:00 -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 1GVPuc-0002U5-D1 for rs_out_1@blacksheep.org; Thu, 05 Oct 2006 10:53:06 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GVPub-0002Tw-Pq for rsgb_lf_group@blacksheep.org; Thu, 05 Oct 2006 10:53:05 +0100 Received: from imo-m17.mx.aol.com ([64.12.138.207]) by relay1.thorcom.net with esmtp (Exim 4.62) (envelope-from ) id 1GVPuX-0003Mr-RU for rsgb_lf_group@blacksheep.org; Thu, 05 Oct 2006 10:53:05 +0100 Received: from MarkusVester@aol.com by imo-m17.mx.aol.com (mail_out_v38_r7.6.) id l.c77.1989255 (60432) for ; Thu, 5 Oct 2006 05:52:50 -0400 (EDT) Received: from FWM-D41 (fwm-d41.webmail.aol.com [205.188.162.17]) by ciaaol-d01.mail.aol.com (v112_r1.5) with ESMTP id MAILCIAAOLD011-ec104524d5f22d6; Thu, 05 Oct 2006 05:52:50 -0400 To: rsgb_lf_group@blacksheep.org Date: Thu, 05 Oct 2006 05:52:50 -0400 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: markusvester@aol.com X-MB-Message-Type: User X-Mailer: AOL eMail 20221 Received: from 217.194.34.103 by FWM-D41.sysops.aol.com (205.188.162.17) with HTTP (WebMailUI); Thu, 05 Oct 2006 05:52:50 -0400 Message-Id: <8C8B67B273EF16D-1348-12E@FWM-D41.sysops.aol.com> X-AOL-IP: 205.188.162.17 X-Spam-Flag: NO X-Spam-Score: -0.5 (/) X-Spam-Report: autolearn=disabled,AWL=-0.797,HTML_40_50=0.086,HTML_MESSAGE=0.001,NO_REAL_NAME=0.178 Subject: Re: LF: Strange signal 500khz Content-Type: multipart/alternative; boundary="--------MailBlocks_8C8B67B273C8F17_1348_288_FWM-D41.sysops.aol.com" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.1 required=5.0 tests=HTML_30_40,HTML_MESSAGE, NO_REAL_NAME 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: 4480 ----------MailBlocks_8C8B67B273C8F17_1348_288_FWM-D41.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Gary, =20 interesting - one of your family members seems to be switching channels rapi= dly ;-) =20 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 certain ch= ains, having group repetition intervals which were multiples of 40 (i.e. 0.8= ms). =20 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 eith= er "ZDF" which used to have their line rate sysnchronized to UTC, or "3sat"=20= which showed a small variable slant due to geostationary satellite residual=20= Doppler. =20 73 de Markus, DF6NM -----Urspr=C3=BCngliche Mitteilung----- Von: g4wgt@tiscali.co.uk An: rsgb_lf_group@blacksheep.org Verschickt: Mi., 4.Okt.2006, 20:30 Thema: RE: LF: Strange signal 500khz Hi Alan & LF, I checked out the strange stepped signal on 500KHz & sure enough it is my own TV set downstairs. 73 Gary - G4WGT. -----Original Message----- From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Alan Melia Sent: 02 October 2006 14:51 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: Strange signal 500khz Hi Tom 500kHz is 32 times the 15.625kHz line frequency for 50Hz framing TV sets. That is why I suggested to the RSGB representative that we do not ask for an allocation at 500 exactly !! I remember this as in the early days of personal computers we used to generate TV line sync by dividing a 1MHz oscillator by 64. Cheers de Alan G3NYK ----- Original Message ----- From: To: Sent: 02 October 2006 14:24 Subject: Re: LF: Strange signal 500khz > Hi, > > I don't know if it's the same. I have on 500 kHz an unid signal from TV sets. > It's not only mine but also from the neighbourhood. I always know when they > went to bed ;-) First I thought if came via the AC net, but even when I use > batteries that 500 kHz TV signal is there. Even when I were on a campground > I was able to identify 2-3 TV sets from other campers. I don't know what > exactly is responsible (inside the TV set system), but it came 100% from them. > Maybe that is also your "problem" ? > > 73, Tom - DL8AAM > > > ----------MailBlocks_8C8B67B273C8F17_1348_288_FWM-D41.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8"
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 ave= rage out in 5 minutes or longer integration times. It appeared only on certa= in 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 wa= s watching either "ZDF" which used to have their line rate sysnchronize= d to UTC, or "3sat" which showed a small variable slant due t= o geostationary satellite residual Doppler.
 
73 de Markus, DF6NM

-----Urspr=C3=BCngliche Mitteilung-----
Von: g4wgt@tiscali.co.uk
An: rsgb_lf_group@blacksheep.org
Verschickt: Mi., 4.Okt.2006, 20:30
Thema: RE: LF: Strange signal 500khz

Hi Alan & LF,

I checked out the strange stepped signal on 500KHz & sure enough it is m=
y
own TV set downstairs.

73

Gary - G4WGT.

-----Original Message-----
From: owner-rsgb_lf_=
group@blacksheep.org
[mailto:owner-r=
sgb_lf_group@blacksheep.org]On Behalf Of Alan Melia
Sent: 02 October 2006 14:51
To: rsgb_lf_group@blackshe=
ep.org
Subject: Re: LF: Strange signal 500khz


Hi Tom 500kHz is 32 times the 15.625kHz line frequency for 50Hz framing TV
sets. That is why I suggested to the RSGB representative that we do not ask
for an allocation at 500 exactly !! I remember this as in the early days of
personal computers we used to generate TV line sync by dividing a 1MHz
oscillator by 64.

Cheers de Alan G3NYK

----- Original Message -----
From: <dl8aam@9a0tcp.ampr.org=
>
To: <rsgb_lf_group@blac=
ksheep.org>
Sent: 02 October 2006 14:24
Subject: Re: LF: Strange signal 500khz


> Hi,
>
> I don't know if it's the same. I have on 500 kHz an unid signal from TV
sets.
> It's not only mine but also from the neighbourhood. I always know when
they
> went to bed ;-) First I thought if came via the AC net, but even when I
use
> batteries that 500 kHz TV signal is there. Even when I were on a
campground
> I was able to identify 2-3 TV sets from other campers. I don't know wha=
t
> exactly is responsible (inside the TV set system), but it came 100% fro=
m
them.
> Maybe that is also your "problem" ?
>
> 73, Tom - DL8AAM
>
>
>
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