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Roger,
it's the CCIR-
RECOMMENDATION 368-7 .
There are no free sources on the internet for these graphs
at least I was not able to find any.
Maybe DK8KW can help you, he has a graph for 150kHz on his HP
where you can also find his email
address.
73
Clemens
DL4RAJ
----- Original Message -----
Sent: Saturday, October 31, 2009 1:28
PM
Subject: LF: 500kHz attenuation
graphs?
Can someone please point me to any CCIR or similar graphs
(preferably on the internet) showing the attenuation with distance expected on
groundwave and skywave at 500kHz?
73s
Roger G3XBM
--
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http://g3xbm-qrp.blogspot.com/
http://www.g3xbm.co.uk
G3XBM
GQRP 1678 ISWL G11088
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