Hello Stefan,
this was discussed many (> 10) years ago and if I remind well the outcome was
that for groundwave the attenuation (in dB) is linear to the distance (as it in
with a coax cable).
I believe that there exist CCIR tables about this.
73, Rik ON7YD - OR7T
________________________________________
Van: [email protected] [[email protected]]
namens Stefan Schäfer [[email protected]]
Verzonden: donderdag 26 mei 2011 14:51
Aan: [email protected]
Onderwerp: 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 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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