DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=btinternet.com;
  h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-Antivirus:X-Antivirus-Status;
  b=CPBVbzpKe7KWfYNJ3GC0NxK5fsr8VXmpjtVWzIxrtrdFaMbcUfpxlRb4tmm3XmfKuaoI6lF10Jv1MeXtzGmK2oA2FB1jZuuDkZLrGa//hunHzWQ9Xq4Ppar4MIgOZyQkdYIcJZUf/UKdaUsSfd7N3+39IgaJ5JGSel51q1mogIg=  ;
Message-ID: <002e01cc722e$601ff170$4001a8c0@lark>
From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4E6F70C2.8090206@iup.uni-heidelberg.de>
Date: Tue, 13 Sep 2011 17:01:13 +0100
MIME-Version: 1.0
DomainKey-Status: good (testing) 
Subject: LF: Re: low noise and OE5ODL
Content-Type: text/plain;
	charset="ISO-8859-15"
Content-Transfer-Encoding: 8bit
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
X-AOL-SCOLL-URL_COUNT: 0  
X-AOL-SCOLL-AUTHENTICATION: mail_rly_antispam_dkim-d004.1 ; domain : btinternet.com DKIM : fail  
x-aol-sid: 3039ac1d40cc4e6f7e865364
X-AOL-IP: 195.171.43.25
X-AOL-SPF: domain : blacksheep.org SPF : none


Hi Stefan be careful with you appreciation of good conditions using the
noise leevel!! The noise usually drops because it is not being propagated so
a low noise condition CAN be a state of poor propagation. I think that is
the case at the moment. The CME associated with the X-Class flare pushed the
Dst down to -60nT and filled the Ring Current region with charge that will
leak into the ionosphere over the following days. This increases the
night-time absorption and reduces DX signal levels. A demo of this is to
look at the levels recorded by Scott VE7TIL for a Russian BC station on
153kHz. This normally strong signal is depressed by 35 to 40dB at present.

Alan G3NYK
http://www.alan.melia.btinternet.co.uk/latest.htm
"almost daily" propagation report for LF.

----- Original Message ----- 
From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Tuesday, September 13, 2011 4:03 PM
Subject: LF: low noise and OE5ODL


> LF/VLF,
>
> Very low noise today on LF and VLF.
>
> Ossi/OE5ODL is QRV again, today on 8970.05 Hz, with the characteristic
> drift. A good ID :-)
>
> Just found some time to build a LF preamp for the ferrite antenna. Maybe
> someone has fun and time to make some acty on 137.7 in a hour or so?
> Would like to compare signal levels and S/N of both, the 50 Ohm preamp
> and the high-Z preamp in a quiet location.
>
> Screenshots will be posted here...
>
> Best 73, Stefan/DK7FC
>
> PS: Will run a QRSS-3 beacon on 137.730 kHz, using 0 V PA supply voltage
> (i.e. no supply). There is a weak signal anyway, just because the FETs
> gets switched! This signal is visible at DF6NM in the QRSS-60 window in
> 174 km distance! ;-)
>