Return-Path: Received: from mtain-mi10.r1000.mx.aol.com (mtain-mi10.r1000.mail.aol.com [172.21.131.168]) by air-dd04.mail.aol.com (v129.4) with ESMTP id MAILINDD041-860a4d514c322c8; Tue, 08 Feb 2011 08:59:14 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mi10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0EC1A38000146; Tue, 8 Feb 2011 08:59:12 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pmo5F-0003fi-N1 for rs_out_1@blacksheep.org; Tue, 08 Feb 2011 13:58:21 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pmo5F-0003fZ-6w for rsgb_lf_group@blacksheep.org; Tue, 08 Feb 2011 13:58:21 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pmo5D-0007u8-8R for rsgb_lf_group@blacksheep.org; Tue, 08 Feb 2011 13:58:20 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id p18DwH9a029352 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 8 Feb 2011 14:58:17 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id p18DwG21014010 for ; Tue, 8 Feb 2011 14:58:16 +0100 Message-ID: <4D514BE9.6010008@iup.uni-heidelberg.de> Date: Tue, 08 Feb 2011 14:58:01 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <252130CB355C48E4BC32BA23475FEF68@White> <009D6A7C37254A8EA7D8EB38B0D418E7@White> In-Reply-To: <009D6A7C37254A8EA7D8EB38B0D418E7@White> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Re: OE5ODL over different frequencies ;-) Content-Type: multipart/alternative; boundary="------------060607060305040103070500" 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 x-aol-global-disposition: G x-aol-sid: 3039400cded24d514c307392 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --------------060607060305040103070500 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit LF, Ossi moved to 6470 Hz at 12 UTC. He uses no balloon today but is visible in "600" anyway, the first time. 73, Stefan/DK7FC Am 08.02.2011 14:03, schrieb Markus Vester: > Jim, thanks for this interesting plot. As the trace is still on my > screen here, I decided to follow your footsteps, and generated the > attached plot. It shows Ossi's frequency offset (mHz from 8970 Hz, > blue), signal level (arbitrary dB units, red), and approximate noise > (dB in 1.5 x 0.95 mHz, green). The ascii data are also attached. > As Mal and Rik say, we would expect some ERP variation from a balloon > antenna, equally affecting all receiver sites. Ossi does run a local > grabber about 10 km from his transmitter (screenshot > attached). Unfortunately the spectrogram colourscale does not > differentiate minor ERP variations. The outage at 11:20 had > been reported yesterday. > The interesting large variations in Jim's plot (about 6 dB pp) do not > seem to appear here. This would hint towards a propagation effect, > which seems odd as the timescale (half hour period) is a bit too fast > for ionospheric Doppler at that range. As the signal at M0BMU was > apparently not too far above the noise, some fluctuations might have > been contributed simply by the stochastic noise vector addition. > Today Ossi is transmitting again. He is about 10 dB weaker than > yesterday so probably running "barefoot" without the balloon. > Best 73, > Markus (DF6NM) > > *From:* James Moritz > *Sent:* Tuesday, February 08, 2011 12:09 AM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* LF: Re: OE5ODL over different paths > > Dear Ossi, Markus, LF Group, > > I was quite interested to notice the sharp dip in OE5ODL's signal at > around > 1430utc today, and in light of Markus' comments, I used the cursor > facilities in SpecLab to manually read off the signal levels, avoiding > the > noise bursts. I also did a quick field strength calibration of the > loop/receiver - the resulting plot of field strength vs time is shown > in the > attachment (the vertical axis should say "dBuV/m"). As well as the > deep null > around 1430, the signal level seems to rise several dB during the day, > peaking around 1800 - 2000, and now starting to fall off. Also, a > downwards > drift in frequency of about 1.5mHz can be seen. > > Cheers, Jim Moritz > 73 de M0BMU --------------060607060305040103070500 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit LF,

Ossi moved to 6470 Hz at 12 UTC. He uses no balloon today but is visible in "600" anyway, the first time.

73, Stefan/DK7FC

Am 08.02.2011 14:03, schrieb Markus Vester:
Jim, thanks for this interesting plot. As the trace is still on my screen here, I decided to follow your footsteps, and generated the attached plot. It shows Ossi's frequency offset (mHz from 8970 Hz, blue), signal level (arbitrary dB units, red), and approximate noise (dB in 1.5 x 0.95 mHz, green). The ascii data are also attached.
 
As Mal and Rik say, we would expect some ERP variation from a balloon antenna, equally affecting all receiver sites. Ossi does run a local grabber about 10 km from his transmitter (screenshot attached). Unfortunately the spectrogram colourscale does not differentiate minor ERP variations. The outage at 11:20 had been reported yesterday.
 
The interesting large variations in Jim's plot (about 6 dB pp) do not seem to appear here. This would hint towards a propagation effect, which seems odd as the timescale (half hour period) is a bit too fast for ionospheric Doppler at that range. As the signal at M0BMU was apparently not too far above the noise, some fluctuations might have been contributed simply by the stochastic noise vector addition.
 
Today Ossi is transmitting again. He is about 10 dB weaker than yesterday so probably running "barefoot" without the balloon.
 
Best 73,
Markus (DF6NM) 
 

Sent: Tuesday, February 08, 2011 12:09 AM
Subject: LF: Re: OE5ODL over different paths

Dear Ossi, Markus, LF Group,

I was quite interested to notice the sharp dip in OE5ODL's signal at around
1430utc today, and in light of Markus' comments, I used the cursor
facilities in SpecLab to manually read off the signal levels, avoiding the
noise bursts. I also did a quick field strength calibration of the
loop/receiver - the resulting plot of field strength vs time is shown in the
attachment (the vertical axis should say "dBuV/m"). As well as the deep null
around 1430, the signal level seems to rise several dB during the day,
peaking around 1800 - 2000, and now starting to fall off. Also, a downwards
drift in frequency of about 1.5mHz can be seen.

Cheers, Jim Moritz
73 de M0BMU
--------------060607060305040103070500--