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LF: 137 kHz groundwave

To: rsgb_lf_group@blacksheep.org
Subject: LF: 137 kHz groundwave
From: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
Date: Thu, 26 May 2011 14:51:01 +0200
Reply-to: rsgb_lf_group@blacksheep.org
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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 137 kHz groundwave seems to "stop" somewhere between these distances, maybe 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 above anytime :-)
73, Stefan/DK7FC


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