Difference between revisions of "HF Propagation"
From The RadioReference Wiki
Line 19: | Line 19: | ||
* [http://home.att.net/~geoclock/index.html Geoclock] | * [http://home.att.net/~geoclock/index.html Geoclock] | ||
* [http://www.mapmaker.com/sunclock.htm SunClock] | * [http://www.mapmaker.com/sunclock.htm SunClock] | ||
+ | * [http://www.g4ilo.com/voaprop.html VOAProp] | ||
* [http://www.qsl.net/w6elprop W6ELProp] propagation prediction software | * [http://www.qsl.net/w6elprop W6ELProp] propagation prediction software | ||
Revision as of 13:27, 17 March 2008
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
- AC6V Propagation Links
- EHam Propagation Links
- Grey Line Map
- Hourly Propagation Maps via HFPack
- NOAA Space Environment Center
- Spaceweather.Com
Software
Technical
- Estimated Planetary K Index
- Earth View great for seeing Greyline
- Planetary View another Greyline view
- NOAA Space Weather Prediction Center
- The Solar Guide via R Nederlands
- Solar Terrestrial Dispatch