Difference between revisions of "HF Propagation"
From The RadioReference Wiki
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* [http://www.hfpack.com/propagation/ Hourly Propagation Maps] via HFPack | * [http://www.hfpack.com/propagation/ Hourly Propagation Maps] via HFPack | ||
* [http://www.fourmilab.ch/cgi-bin/uncgi/Earth/action?opt=-p Earth View] great for seeing Greyline | * [http://www.fourmilab.ch/cgi-bin/uncgi/Earth/action?opt=-p Earth View] great for seeing Greyline | ||
| + | ** [http://www.fourmilab.ch/cgi-bin/uncgi/Earth/action?opt=-p Earth View (Mercator projection)] | ||
| + | ** [http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&opt=-l&lat=37.0833&ns=North&lon=72.4167&ew=West&alt=35785&img=learth.evif Earth view (from above)] | ||
* [http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&opt=-l&lat=37.0833&ns=North&lon=72.4167&ew=West&alt=35785&img=learth.evif Planetary View] another Greyline view | * [http://www.fourmilab.ch/cgi-bin/uncgi/Earth?imgsize=320&opt=-l&lat=37.0833&ns=North&lon=72.4167&ew=West&alt=35785&img=learth.evif Planetary View] another Greyline view | ||
* [http://science.nasa.gov/headlines/y2008/30apr_4dionosphere.htm 4D View of Ionosphere] NASA website | * [http://science.nasa.gov/headlines/y2008/30apr_4dionosphere.htm 4D View of Ionosphere] NASA website | ||
Revision as of 11:35, 2 April 2010
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
- AC6V Propagation Links
- EHam Propagation Links
- Ham Radio Online- Radio Propagation Conditions
- Spaceweather.Com
- Online Maps
- Grey Line Map
- Hourly Propagation Maps via HFPack
- Earth View great for seeing Greyline
- Planetary View another Greyline view
- 4D View of Ionosphere NASA website
Software
- ACE HF
- Geoclock
- SunClock
- VOACap
- VOAProp
- W6ELProp propagation prediction software
- Daylight Clock applet Greyline Display and Clock for the Logitech SqueezeBox series Wifi players.
- Proplab Pro