HFU HF Underground
Technical Topics => Propagation => Topic started by: Josh on May 21, 2019, 1923 UTC
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ITURHFPROP;
https://www.itu.int/en/ITU-R/study-groups/rsg3/Pages/iono-tropo-spheric.aspx
Online and real time;
http://giro.uml.edu/IRTAM/
https://www.sws.bom.gov.au/HF_Systems/7/1