Return-Path: Received: from mtain-mp02.r1000.mx.aol.com (mtain-mp02.r1000.mx.aol.com [172.29.193.70]) by air-mc03.mail.aol.com (v129.4) with ESMTP id MAILINMC033-a8dd4d52d9a8c; Wed, 09 Feb 2011 13:15:04 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 32D08380000D4; Wed, 9 Feb 2011 13:15:02 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PnEYP-0000Tm-AB for rs_out_1@blacksheep.org; Wed, 09 Feb 2011 18:14:13 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PnEYO-0000TT-Ii for rsgb_lf_group@blacksheep.org; Wed, 09 Feb 2011 18:14:12 +0000 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PnEYM-0001TI-6O for rsgb_lf_group@blacksheep.org; Wed, 09 Feb 2011 18:14:12 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiYBAHJoUk1cEYb1/2dsb2JhbACTC4NiDo5Nc7wkhVwEgWKNWg X-IronPort-AV: E=Sophos;i="4.60,446,1291593600"; d="scan'208,217";a="355242561" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.134.245]) by out1.ip02ir2.opaltelecom.net with SMTP; 09 Feb 2011 18:14:02 +0000 Message-ID: <004001cbc885$1e791b50$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <252130CB355C48E4BC32BA23475FEF68@White> <009D6A7C37254A8EA7D8EB38B0D418E7@White> Date: Wed, 9 Feb 2011 18:13:57 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: Re: Re: OE5ODL over different paths Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01CBC885.1E281520" 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: 3039ac1dc1464d52d9a64b92 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none ------=_NextPart_000_003D_01CBC885.1E281520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Markus How do you explain the reason that I can work ES6AM and EW6GB at good= OOO copy yet these stations are not visible on the DK7FC grabber. I= have my theory but prefer to hear what you have to say This also applies to other stns like RN3AGC which are good copy with= me but agn not visible on other grabbers like DK7FC This has been my most recent observations when I have been in QSO with= these stations. De Mal/g3kev ----- Original Message -----=20 From: Markus Vester=20 To: rsgb_lf_group@blacksheep.org=20 Sent: Tuesday, February 08, 2011 1:03 PM Subject: LF: Re: OE5ODL over different paths Jim, thanks for this interesting plot. As the trace is still on my= screen here, I decided to follow your footsteps, and generated the at= tached 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 balloo= n antenna, equally affecting all receiver sites. Ossi does run a local= grabber about 10 km from his transmitter (screenshot attached). Unfor= tunately 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 no= t 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 app= arently 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 yest= erday so probably running "barefoot" without the balloon. Best 73, Markus (DF6NM)=20 From: James Moritz=20 Sent: Tuesday, February 08, 2011 12:09 AM To: rsgb_lf_group@blacksheep.org=20 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=20 1430utc today, and in light of Markus' comments, I used the cursor= =20 facilities in SpecLab to manually read off the signal levels, avoidi= ng the=20 noise bursts. I also did a quick field strength calibration of the= =20 loop/receiver - the resulting plot of field strength vs time is show= n in the=20 attachment (the vertical axis should say "dBuV/m"). As well as the= deep null=20 around 1430, the signal level seems to rise several dB during the da= y,=20 peaking around 1800 - 2000, and now starting to fall off. Also, a do= wnwards=20 drift in frequency of about 1.5mHz can be seen. Cheers, Jim Moritz 73 de M0BMU=20 ------=_NextPart_000_003D_01CBC885.1E281520 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Markus
How do you explain the reason that I can work= ES6AM and=20 EW6GB at good OOO copy yet these stations are not visible on the DK7FC= grabber.=20 I have my theory but prefer to hear what you have to say
This also applies to other stns like RN3AGC wh= ich are good=20 copy with me but agn not visible on other grabbers like DK7FC
This has been my most recent observations when= I have been=20 in QSO with these stations.
 
De Mal/g3kev
 
----- Original Message -----
Sent: Tuesday, February 08,= 2011 1:03=20 PM
Subject: LF: Re: OE5ODL over= different=20 paths

Jim, thanks for=20 this interesting plot. As the trace is still on my screen here, I de= cided to=20 follow your footsteps, and generated the attached plot. It= shows=20 Ossi's frequency offset (mHz from 8970 Hz, blue), signal level = (arbitrary=20 dB units, red), and approximate noise (dB in 1.5 x 0.95 mHz, green).= The ascii=20 data are also attached.
 
As Mal and Rik say, we would expect= some ERP=20 variation from a balloon antenna, equally affecting all receive= r sites.=20 Ossi does run a local grabber about 10 km from his transmitter (scre= enshot=20 attached). Unfortunately the spectrogram colourscale&= nbsp;does=20 not differentiate minor ERP variations. The outage at 11:20 had=20 been reported yesterday.
 
The interesting large variatio= ns in Jim's=20 plot (about 6 dB pp) do not seem to appear here. This would hint tow= ards a=20 propagation effect, which seems odd as the timescale (half hour= period)=20 is a bit too fast for ionospheric Doppler at that range.= As the=20 signal at M0BMU was apparently not too far above the noise, som= e=20 fluctuations might have been contributed simply by the stochastic no= ise vector=20 addition.
 
Today Ossi is transmitting again.= He is=20 about 10 dB weaker than yesterday so probably running "barefoot" wit= hout the=20 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 inter= ested to=20 notice the sharp dip in OE5ODL's signal at around
1430utc today,= and in=20 light of Markus' comments, I used the cursor
facilities in SpecL= ab to=20 manually read off the signal levels, avoiding the
noise bursts.= I also did=20 a quick field strength calibration of the
loop/receiver - the re= sulting=20 plot of field strength vs time is shown in the
attachment (the= vertical=20 axis should say "dBuV/m"). As well as the deep null
around 1430,= the=20 signal level seems to rise several dB during the day,
peaking ar= ound 1800=20 - 2000, and now starting to fall off. Also, a downwards
drift in= frequency=20 of about 1.5mHz can be seen.

Cheers, Jim Moritz
73 de M0BM= U=20
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