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.
If you're just getting started in the HF hobby, AE4RV's Propagation Primer is an excellant place to start. Note that you need the most up to date Flash software to view this site.
Links and Online Maps
- Links
- ARRL Propagation pages
- AC6V Propagation Links
- EHam Propagation Links
- Spaceweather.Com
- W3WLG Amateur Radio Software - Greyline Map
- Online Maps
- Earth View great for seeing Greyline
- Near-Real-Time MUF Map
- Hourly Propagation Maps via HFPack
- PropNet Communication Circuit Quality Report
Software
- Daylight Clock applet Greyline Display and Clock for the Logitech SqueezeBox series Wifi players.
- Proplab Pro
- VOACap
- VOAProp
- W6ELProp propagation prediction software
Technical
- ARRL - Sun, Earth and the ionosphere
- DXLC Solar Conditions
- DX QSL Net-Propagation
- HFRadio.org Propagation, Space Weather and Sunspot Cycle Resource Center
- HF Underground - Propagation Data and Tools
- IPS Radio and Space Services
- NOAA Space Weather Prediction Center
- Solar Activity and HF Propagation Note: PDF file from QRPARCI
- Solar Dynamics Observatory
- SolarHam
- Solar Terrestrial Dispatch
- Topband Propagation
- WM7D Solar Research Page
- Working the Grey Line
- W2XQ-Propagation, Solar and Space Weather