Return-Path: Received: from mtain-mg07.r1000.mx.aol.com (mtain-mg07.r1000.mx.aol.com [172.29.96.207]) by air-mc07.mail.aol.com (v129.4) with ESMTP id MAILINMC073-a97d4d04f701f7; Sun, 12 Dec 2010 11:23:29 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg07.r1000.mx.aol.com (Internet Inbound) with ESMTP id F290C3800010D; Sun, 12 Dec 2010 11:23:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PRogs-0002ME-Vi for rs_out_1@blacksheep.org; Sun, 12 Dec 2010 16:22:26 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PRogs-0002M5-F7 for rsgb_lf_group@blacksheep.org; Sun, 12 Dec 2010 16:22:26 +0000 Received: from imr-mb02.mx.aol.com ([64.12.207.163]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PRogp-0004SI-GC for rsgb_lf_group@blacksheep.org; Sun, 12 Dec 2010 16:22:26 +0000 Received: from mtaout-mb04.r1000.mx.aol.com (mtaout-mb04.r1000.mx.aol.com [172.29.41.68]) by imr-mb02.mx.aol.com (8.14.1/8.14.1) with ESMTP id oBCGMFHr003666 for ; Sun, 12 Dec 2010 11:22:15 -0500 Received: from White (nrbg-4d073628.pool.mediaWays.net [77.7.54.40]) by mtaout-mb04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id C4930E000128 for ; Sun, 12 Dec 2010 11:22:12 -0500 (EST) Message-ID: From: "Markus Vester" To: References: Date: Sun, 12 Dec 2010 17:22:45 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: DCF and HGA modulation spectra Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01CB9A21.31157840" 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_MESSAGE, MISSING_OUTLOOK_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 x-aol-global-disposition: G x-aol-sid: 3039ac1d60cf4d04f6ff1327 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_000E_01CB9A21.31157840 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear LF, the LF grabber capture at http://df6nm.bplaced.net/LF/test1012121515.j= pg is a good example of the modulation spectra of HGA22 and DCF39. At 15:04, I had deactivated the noise blanker, which is normally used= to cut out most of the DCF39 modulation clicks. Thereafter, you can= see the true spectral content of the FSK sidebands. The strong purple= (ie. northerly) vertical lines intruding from the top are from DCF39= Magdeburg, and the red (ie. easterly) ones near the bottom are from= HGA22 Budapest. Between 15:05 and 15:12, there is a dense block of telegrams, which is= transmitted from all "EFR" stations in near synchronism. The newer DC= F39 transmitter (which was put to service in 2007) obviously has virtu= ally unfiltered modulation, with keyclicks going down all the way to= about 136.5 kHz. Below that, HGA22 takes over, with a somewhat narrow= er modulation but of course closer to the carrier. The two of them com= bined are covering up all of the LF band here. The gaps in the red HGA spectrum are clearly visible, at all multiples= of approx. 200 Hz from the active space frequency 135.77 kHz. There= are blue dashes from "Z" (SM6BHZ?), fitting in nicely at 137.176 kHz.= The different effect on proposed Eu slot frequencies can be seen on= http://df6nm.bplaced.net/LF/testEu1012121515.jpg . Interestingly, DCF39 is different in that there are actually two sets= of gaps, spaced at 200 Hz intervals around both the mark and space fr= equency. This is probably due to a subtle difference in the serial st= op-bit timing between the transmitters. In effect, nulls are at at 137= .765, 137.565, etc. kHz, and also at 137.83, 137.63, ... kHz. In the= capture there are faint yellow dashes from OE5ODL at 137774.5, indica= ting that our TA slot allocation is actually just a tad too high to fi= t into a gap. Best 73, Markus (DF6NM) From: Markus Vester=20 Sent: Sunday, December 12, 2010 3:13 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: New Eu slot 136.177 kHz? ... Here in Europe and Russia, a possible disadvantage of going down is th= at we would also come closer to HGA22. This is the 100 kW telecontrol= transmitter in Budapest, an idle carrier sitting at 135.43 kHz, and= excursions to 135.77 during FSK bursts. Normally these bursts appear= every 11 seconds, but at times there are annoying blocks of consecuti= ve telegrams several minutes long. Here in Bavaria, the FSK modulation= sidebands are visibe up to about 136.5 kHz, but there are pronounced= spectral gaps due to the 200 bd modulation. These clear gaps are near= 135.97, 136.17 and 136.37 kHz.=20 ... ------=_NextPart_000_000E_01CB9A21.31157840 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dear LF,
 
the LF grabber capture at http://df6nm.bplaced.net/LF/test1012121515.jpg<= /A> is=20 a good example of the modulation spectra of HGA22 and DCF39.
 
At 15:04, I had deactivated the noise= blanker,=20 which is normally used to cut out most of the DCF39 modulati= on clicks.=20 Thereafter, you can see the true spectral content of the FSK sidebands= . The=20 strong purple (ie. northerly) vertical=20 lines intruding from the top are from DCF39 Magdeburg,= and the=20 red (ie. easterly) ones near the bottom are from HGA22 Budapest.
 
Between 15:05 and 15:12, there is a= dense block of=20 telegrams, which is transmitted from all "EFR" stations in= near=20 synchronism. The newer DCF39=20 transmitter (which was put to service in 2007) obviously has= virtually=20 unfiltered modulation, with keyclicks going down all th= e way to=20 about 136.5 kHz. Below that, HGA22 takes over, with a somewh= at=20 narrower modulation but of course closer to the carrier. The= two of=20 them combined are covering up all of the LF band here.
 
 
Interestingly, DCF39 is different in= that there are=20 actually two sets of gaps, spaced at 200 Hz intervals around both= the mark=20 and space frequency. This is probably due to a subtle difference = in the=20 serial stop-bit timing between the transmitters. In effect, nulls are= at at=20 137.765, 137.565, etc. kHz, and also at 137.83, 137.63,=  ...=20 kHz. In the capture there are faint yellow dashes from OE5OD= L at=20 137774.5, indicating that our TA slot allocation is actually= just=20 a tad too high to fit into a gap.
 
Best 73,
Markus (DF6NM)
 
 
Sent: Sunday, December 12, 2010 3:13 PM
Subject: LF: New Eu slot 136.177 kHz?
...
Here in Europe and Russia, a pos= sible=20 disadvantage of going down is that we would also come closer to HGA22.= This is=20 the 100 kW telecontrol transmitter in Budapest, an idle carrier= sitting at=20 135.43 kHz, and excursions to 135.77 during FSK bursts. Normally= these=20 bursts appear every 11 seconds, but at times there are annoying= blocks of=20 consecutive telegrams several minutes long. Here in Bavaria, the = FSK=20 modulation sidebands are visibe up to about 136.5 kHz, but there= are=20 pronounced spectral gaps due to the 200 bd modulation. These clea= r gaps=20 are near 135.97, 136.17 and 136.37 kHz.
...
 
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