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http://www.yv5fih.org.ve

eHam.net Propagation page

hfradio.org propagation page

National Oceanic and Atmospheric Administration (NOAA)

SEC´s Radio User´s Page

NorthWest Research Associates, Inc. Space Weather Services

RWC Belgium World Data Center for the Sunspot Index

IPS Radio and Space Services

Propagación HF desde Venezuela



HF Communications Warnings

HF Fadeout Warnings

Polar Cap Absortion Warnings