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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <COL122-W48BF49A60927B089AE423CD3B00@phx.gbl> <4C305875.8010902@legal-medicine.de> <4C3062A2.5000701@usa.net> <4C307F08.3090903@legal-medicine.de> <4C30A525.8070302@usa.net> <op.vfb9msqqyzqh0k@pc1> <001401cb1d55$2369c0f0$8d01a8c0@JAYDELL> <op.vfho1r13yzqh0k@pc1> <4C34FB12.6000908@iup.uni-heidelberg.de>
Date: Wed, 7 Jul 2010 23:27:11 +0100
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Subject: LF: Re: QRN
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Hi Stefan, be very careful about your belief that the noise is lower=
 in the
morning !! This may not be the case. It may be quieter but..........Th=
ere
are two components of noise local and distant It could be that the dis=
tant
noise is not propagaing as well at dawn!! This is what happens on 136k=
Hz. It
was thought for a long time that this was the best time for QSOs......=
.but
in practice it was found not to be so. The best time was usually a few=
 hours
earlier. Just pre-dawn at mid-path. The noise was higher but the wante=
d
signal was also a lot stronger.

I am cautious about extrapolating 136 to 9kHz  but at 20kHz the mornin=
g an
evening dips on the stations monitored by SID detectors are due to inc=
reased
aborption. On 136 the mornings are quiet on the west coasts of Europe=
 the
sun has destroyed the skywave from eastern Europe. On the Easten Coast=
 of
the US the quietest time is the evening when the shadow is just aproac=
hing
and the noise sources to the west are still in daylight. I admit I don=
t know
how the VLF noise behaves. Though I suspect a lot of that is lighning
induced.

Alan G3NYK
----- Original Message -----=20
From: "Stefan Sch=E4fer" <schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, July 07, 2010 11:09 PM
Subject: VLF: QRN


> Dear group,
>
> Today the average VLF QRN level was pretty low! Also the minimum QRN=
 gap
> in the morning becomes braoder again. Maybe the most awaited DX peri=
od
> starts slowly?
>
> Best wishes, Stefan/DK7FC
>