HF Propagation
From The RadioReference Wiki
Radio and TV signals aren't always limited to traveling line of sight distances. On HF this is commonly caused by refraction (bending) of the signal at the upper layers of the atmosphere known as the ionosphere. On frequencies higher than this, while solar activity plays a role, Earth based weather
events are the most common cause of propagation. These links explore several sites, and software,
that can be used to help predict how a HF signal will propagate. For propagation topics above 30 Mhz,
please see our DXing Above 30 Mhz article.
Links and Online Maps
- Links
- AC6V Propagation Links
- ARRL Propagation pages
- EHam Propagation Links
- HF-Start
- Proppy
- Simon's World Map
- Online Maps
- Earth View great for seeing Greyline
- HF Propagation Map
- MUF map from KC2G
- PropNet Communication Circuit Quality Report
Software
- Daylight Clock applet Greyline Display and Clock applet
- Proplab Pro
- VOACap
- VOAProp
- W6ELProp propagation prediction software
Technical
- Australian Space Weather Services
- DX QSL Net-Propagation
- Global Ionosphere Radio Observatory
- HFRadio.org Propagation, Space Weather and Sunspot Cycle Resource Center
- HF Underground - Propagation Data and Tools
- International Space Environment Service
- NASA
- NOAA Space Weather Prediction Center
- Rob's Web - Introduction to Grey Line DXing
- Solar Activity and HF Propagation Note: PDF file from QRPARCI
- SolarHam
- Solar Influences Data Analysis Center
- SolarMonitor.org
- Solar Terrestrial Dispatch
- Spaceweather.com
- SpaceWeather Canada
- Tromsø (Norway) Geophysical Observatory
- WM7D Solar Research Page
- Working the Grey Line
- Usable HF Frequencies - Amateur Radio
- University of Alaska Fairbanks Geophysical Institute Aurora Forecast