The tools provided by this web application enable users to predict available frequencies, signal levels and corresponding reliabilities for High Frequency (HF) circuits for user defined paths and times. Predictions are performed using the ITURHFProp application (A software method for the prediction of the performance of HF circuits in accordance with Recommendation ITU-R P.533-13) provided by the ITU.

The ITURHFProp application is available from the ITU's website at the following location; http://www.itu.int/en/ITU-R/study-groups/rsg3/Pages/iono-tropo-spheric.aspx.

Full details of Proppy's features may be found in the Manual, available on-line or as a .pdf download.

Three prediction modes are supported:

Area
An interactive interface used to predict geographical coverage for a given site at a specified time and frequency.
Point-to-Point
Predicts link performance for a specified path over a 24 hour period in a given month.
Planner
Used to create propagation charts similar to those made available by the ARRL; presenting up to 12 Point-to-Point predictions on a single sheet suitable for printing and keeping by the radio.

Useful References

The following material may be of interest when researching HF Propagation and ITURHFProp;

Acknowledgements

Development of this web application has been made possible with the generous assistance of Chris Behm and George Engelbrecht, creators of the ITURHFPROP application. In addition, Bill Ingram provided valuable assistance on the construction of antenna input files.

I would also like to thank John Stephen Dumadag, REE for help with the NEC antenna modelling.

Jari's VOACAP Site was a priceless source of inspiration for the main user interface.

Translations

I'm grateful for the efforts of the following for their help with translating the site;

Open Source Tools

This site uses uses a number of open source tools for which I'm very grateful to the following;