LF: Re: low noise and OE5ODL

["Alan Melia" <alan.melia@btinternet.com>]

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! ;-)
>