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From: "Alan Melia" <alan.melia@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <4DDE4CB5.4040803@iup.uni-heidelberg.de>
Date: Thu, 26 May 2011 15:31:33 +0100
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Subject: LF: Re: 137 kHz groundwave
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Hi Stefan it may be daytime but both of those paths will be skywave ev=
en in
daytime at your power levels. Skywave and groundwave are about the sam=
e
starength at about 700km acording to all the papers. Dont forget the
waterfals are very non-linear it only takes about 3dB change in signal
strength to go from T to O+++, also you are seeing S/N which may be hi=
gher
in 4X4 although I got a rumble overhead a few minites ago and the rain=
 was
horizontal.

Alan G3NYK

----- Original Message -----=20
From: "Stefan Sch=E4fer" <schaefer@iup.uni-heidelberg.de>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, May 26, 2011 1:51 PM
Subject: LF: 137 kHz groundwave


> LF,
>
> I just sent some CQ calls on 137.71 kHz and saw the signal at about=
 the
> same strength on the G4WGT grabber in 910 km, O copy. But there is=
 no
> trace at all on the YO/4X1RF grabber in 1426 km (in QRSS-10). The 13=
7
> kHz groundwave seems to "stop" somewhere between these distances, ma=
ybe
> arround 1000km.
> I'm sure some of you have some better theoretical and/or practical
> experience about that?
> Another advantage of VLF,where it's "easy" to reach 2500 km and abov=
e
> anytime :-)
>
> 73, Stefan/DK7FC
>