X-GM-THRID: 1212509151608325109 X-Gmail-Labels: rsgb lf X-Gmail-Received: f027cbde86f8996a7d574206f54a94d3765963d0 Delivered-To: daveyxm@gmail.com Received: by 10.64.249.16 with SMTP id w16cs6395qbh; Mon, 28 Aug 2006 21:47:06 -0700 (PDT) Received: by 10.49.94.20 with SMTP id w20mr542212nfl; Mon, 28 Aug 2006 21:47:05 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mx.gmail.com with ESMTP id z73si274977nfb.2006.08.28.21.46.58; Mon, 28 Aug 2006 21:47:05 -0700 (PDT) Received-SPF: neutral (gmail.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 1GHvR2-00037M-76 for rs_out_1@blacksheep.org; Tue, 29 Aug 2006 05:42:48 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1GHvR1-00037D-Mp for rsgb_lf_group@blacksheep.org; Tue, 29 Aug 2006 05:42:47 +0100 Received: from moutng.kundenserver.de ([212.227.126.186]) by relay1.thorcom.net with esmtp (Exim 4.62) (envelope-from ) id 1GHvQx-0003HK-Q2 for rsgb_lf_group@blacksheep.org; Tue, 29 Aug 2006 05:42:47 +0100 Received: from [217.251.227.102] (helo=W1KW) by mrelayeu.kundenserver.de (node=mrelayeu2) with ESMTP (Nemesis), id 0MKwtQ-1GHvQt2aD1-0003KM; Tue, 29 Aug 2006 06:42:41 +0200 Message-ID: <001c01c6cb25$9d825270$0100a8c0@W1KW> From: "Holger 'Geri', DK8KW" To: References: <584.3adc3c8.3224be5f@aol.com> Date: Tue, 29 Aug 2006 06:43:03 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 X-Provags-ID: kundenserver.de abuse@kundenserver.de login:a8046abf013a2aee3cd9c470ba16bfdf X-Spam-Score: 0.1 (/) X-Spam-Report: autolearn=disabled,AWL=-0.009,HTML_40_50=0.086,HTML_MESSAGE=0.001 Subject: Re: LF: DCF39 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0019_01C6CB36.6047AB60" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,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: 4529 This is a multi-part message in MIME format. ------=_NextPart_000_0019_01C6CB36.6047AB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Markus, very interesting graph. I guess at the currently high energy costs someone at the Europ=E4ischen = Funkrundsteuerung GmbH (EFR) must have started to think if it is really = necessary to put a 40 to 50 kW permanent carrier on the air to remotely = switch on and off street lamp. These 3 dB steps might be tests for a = system to reduce the carrier level at least between the telegrams to = save costs. =20 Best 73 Geri, DK8KW / W1KW / DI2BO ----- Original Message -----=20 From: MarkusVester@aol.com=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Monday, August 28, 2006 11:47 PM Subject: Re: LF: DCF39 Dear LF group, stimulated by Jim's observation of DCF-39 outages, I set up SpecLab's = plotter to monitor the 138.83 kHz carrier from Sunday afternoon till = tonight. The two dark blue traces show the maximum and mininimum amplitudes = within each two minute measurement interval. The usual 3 mV/m carrier, = attenuated at the passband edge, places the upper trace at about 40% = relative magnitude. The minimum trace reflects the energy spread during = the short telegrams, about -8dBc when smeared by 0.34 Hz resolution = bandwidth. On Sunday afternoon, I aurally observed many short interruptions, = where the carrier went off completely after a telegram, and ramped back = up after a couple of seconds. These appear as dips to zero in the = minimum trace. There was also a long outage between 12:00 and 14:15. Another interesting feature is the apparent power switching. These 3 = dB steps were again accompanied by short breaks, and occured at 20:40 = (up), Monday 5:40 (down), 7:40 (up), 8:50 (down), 9:10 (up), 9:35 = (down). The light blue trace shows the recorded azimut, which should of course = be constant and due north. The irregular nighttime variations are = usually introduced by ionospheric multipath. However the slower daytime deviations (300 to 350 degrees) are an = artifact due to E-field antenna detuning by moisture. This "summer = antenna" is a just piece of wire strung among the branches of a fir = tree, and series resonated with about 10 mH. Whenever it starts to rain = (which was often, e.g. at 16:05), its phase is retarded and the apparent = azimuth deviates clockwise, letting the SXV trace on my grabber display = turn from orange to greenish (makes sense doesn't it ;-) I have tried to = minimize this by loading the antenna with a high receiver input = impedance, but there is probably also a direct dielectric effect = disturbing the local electric field. The red traces and dots are for SXV around 135.75 kHz. They show the = usual morning and afternoon fieldstrength minima, as well as the same = weather artifacts in azimuth. 73 and best wishes Markus, DF6NM -------------------------------------------------------------------------= ----- ------=_NextPart_000_0019_01C6CB36.6047AB60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello Markus,
 
very interesting graph.
 
I guess at the currently high energy = costs someone=20 at the Europ=E4ischen = Funkrundsteuerung GmbH=20 (EFR) must have started to think if it is really necessary to put a 40 = to 50 kW=20 permanent carrier on the air to remotely switch on and off street = lamp.=20 These 3 dB steps might be tests for a system to reduce the carrier = level at=20 least between the telegrams to save costs.  
 
Best=20 73
 
Geri, DK8KW / W1KW / DI2BO
 
 
 
 
----- Original Message -----
From:=20 MarkusVester@aol.com
Sent: Monday, August 28, 2006 = 11:47=20 PM
Subject: Re: LF: DCF39

Dear LF group,

stimulated by = Jim's=20 observation of DCF-39 outages, I set up SpecLab's plotter to monitor = the=20 138.83 kHz carrier from Sunday afternoon till tonight.

The two = dark=20 blue traces show the maximum and mininimum amplitudes within each two = minute=20 measurement interval. The usual 3 mV/m carrier, attenuated at the = passband=20 edge, places the upper trace at about 40% relative magnitude. The = minimum=20 trace reflects the energy spread during the short telegrams, about = -8dBc when=20 smeared by 0.34 Hz resolution bandwidth.

On Sunday afternoon, I = aurally=20 observed many short interruptions, where the carrier went off = completely after=20 a telegram, and ramped back up after a couple of seconds. These appear = as dips=20 to zero in the minimum trace. There was also a long outage between = 12:00 and=20 14:15.

Another interesting feature is the apparent power = switching.=20 These 3 dB steps were again accompanied by short breaks, and occured = at 20:40=20 (up), Monday 5:40 (down), 7:40 (up), 8:50 (down), 9:10 (up), 9:35=20 (down).

The light blue trace shows the recorded azimut, which = should of=20 course be constant and due north. The irregular nighttime variations = are=20 usually introduced by ionospheric multipath.

However the slower = daytime=20 deviations (300 to 350 degrees) are an artifact due to E-field antenna = detuning by moisture. This "summer antenna" is a just piece of wire = strung=20 among the branches of a fir tree, and series resonated with about 10 = mH.=20 Whenever it starts to rain (which was often, e.g. at 16:05), its phase = is=20 retarded and the apparent azimuth deviates clockwise, letting the SXV = trace on=20 my grabber display turn from orange to greenish (makes sense doesn't = it ;-) I=20 have tried to minimize this by loading the antenna with a high = receiver input=20 impedance, but there is probably also a direct dielectric effect = disturbing=20 the local electric field.

The red traces and dots are for SXV = around=20 135.75 kHz. They show the usual morning and afternoon fieldstrength = minima, as=20 well as the same weather artifacts in azimuth.

73 and best=20 wishes
Markus, DF6NM

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