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.533-14) provided by the ITU.


The ITURHFProp application is available from the ITU's website at the following location;

The source code for the ITURHFProp application is available on GitHub at

Linux users wishing to run the application on their own machine can install iturhfprop from a snap package which may be downloaded from here (91MB file). Install the snap with the following command (the --dangerous argument is required as the package is unsigned);

sudo snap install --dangerous iturhfprop_0.1_amd64.snap

The snap package contains the binary code and the required data files. When running iturhfprop from the snap package, the DataFilePath parameter should be set as;

DataFilePath "/snap/iturhfprop/current/usr/share/iturhfprop/data/"


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:

An interactive interface used to predict geographical coverage for a given site at a specified time and frequency.
Predicts link performance for a specified path over a 24 hour period in a given month.
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;


The SWL page uses information provided by the HFCC at

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 site,, was a priceless source of inspiration for the main user interface and Jari has also generously extended permission for me to use some of the Type 14 antenna models used by


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

Shortwave Schedules

The shortwave schedules on the SWL page are based on information provided by the HFCC at

Open Source Tools

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