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VOACAP (Voice of America Coverage Analysis Program) is a 
Some movies on the coverage during daytime can be found here.
radio propagation model
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere.
As a form of electromagnetic radiation, like light waves, radio waves are affected ...
that uses empirical data to predict the point-to-point path loss
Path loss, or path attenuation, is the reduction in power density (attenuation) of an electromagnetic wave as it propagates through space. Path loss is a major component in the analysis and design of the link budget of a telecommunication system ...
and coverage of a given transceiver if given as inputs: two antennas (configuration and position), solar weather, and time/date. Written in Fortran, it was originally designed for Voice of America
Voice of America (VOA or VoA) is the State media, state-owned news network and International broadcasting, international radio broadcaster of the United States, United States of America. It is the largest and oldest U.S.-funded international br ...
.
Some movies on the coverage during daytime can be found here.
Simulating HF propagation conditions
Currently versions based on the original source tree exist for Windows, Linux (voacapl) and OSX. The program core uses text files for I/O and a bunch of wrappers now exist. Besides commercial visualization tools, there are also Open Source implementations with GUI: * VOACAP online using ITS' IONCAP model, available at http://www.voacap.com/prediction.html * the PropagationPython Project. aka "Proppy" which is an evolution and alternate to VOACAP using the new ITURHFProp prediction model (formerly REC533) and always in development by James Watson For immediate results, VOACAP provides a web interface for both the coverage and the prediction.Online Voacap prediction http://www.voacap.com/prediction.htmlSee also
*Shortwave
Shortwave radio is radio transmission using shortwave (SW) radio frequencies. There is no official definition of the band, but the range always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (100 to 10 me ...
* Radio propagation model
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere.
As a form of electromagnetic radiation, like light waves, radio waves are affected ...
* Radio propagation
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere.
As a form of electromagnetic radiation, like light waves, radio waves are affect ...
References