Message-ID: <4E7093B3.5030807@iup.uni-heidelberg.de>
Date: Wed, 14 Sep 2011 13:44:51 +0200
From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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References: <4E6F70C2.8090206@iup.uni-heidelberg.de> <002e01cc722e$601ff170$4001a8c0@lark>
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Subject: Re: LF: Re: low noise and OE5ODL
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Hi Alan,

Thanks for the observations.

Am 13.09.2011 18:01, schrieb Alan Melia:
> Hi Stefan be careful with you appreciation of good conditions using the
> noise leevel!!
Have i been talking about good conditions?

>   The noise usually drops because it is not being propagated so
> a low noise condition CAN be a state of poor propagation.
Yes, that should be the case now. And this applies for VLF too, at least=20
here in EU the band was very quiet, just like in winther. Also the time=20
window of low QRN is as low as in winther!
This may be a disadvantage for DX but on VLF, Ossi's signal has a nice=20
S/N for that antenna current and his non-Kite/ballon supportet antenna.

>   I think that is
> the case at the moment. The CME associated with the X-Class flare pushe=
d the
> Dst down to -60nT and filled the Ring Current region with charge that w=
ill
> leak into the ionosphere over the following days. This increases the
> night-time absorption and reduces DX signal levels. A demo of this is t=
o
> 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 prese=
nt.
>   =20
Yes, also very good visible at http://icas.to/argo/dcf39.htm

Hope condx are back soon. When do you expect the conds are back to=20
normality?

Best 73, Stefan/DK7FC


> Alan G3NYK
> http://www.alan.melia.btinternet.co.uk/latest.htm
> "almost daily" propagation report for LF.
>
> ----- Original Message -----
> From: "Stefan Sch=E4fer"<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
>
>
>   =20
>> 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. May=
be
>> 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 volta=
ge
>> (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 i=
n
>> 174 km distance! ;-)
>>
>>     =20
>   =20