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.
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;
ITU BR Indices , Circular of Basic Indices for Ionospheric Propagation, Latest
ITU-R F.240-7 , Signal-to-Interference Protection Ratios for Various Classes of Emission in the Fixed Service Below About 30 MHz, Recommendation ITU-R F.240-7
ITU-R F.339-8 , Bandwidths, Signal-to-Noise Ratios and Fading Allowances in HF Fixed and Land Mobile Radiocommunication Systems, Recommendation ITU-R F.339-8
ITU-R P.1148-1 , Standardized Procedure for Comparing Predicted and Observed HF Sky-Wave Signal Intensities and the Presentation of Such Comparisons, Recommendation ITU-R P.1148-1
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, voacap.com, 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 voacap.com.
Translations
I'm grateful for the efforts of the following for their help with translating the site;
Arabic (ar): Rami Saadeh
Finnish (fi): Jari Perkiömäki (OH6BG/OG6G)
German (de): Heribert Lennertz (7Z1HL / DL8KAY)
Italian (it): Marco Colombo (IU2DXF)
Spanish (es): Javier Albinarrate (LU8AJA)
Shortwave Schedules
The shortwave schedules on the SWL page are based on information provided by the HFCC at http://www.hfcc.org/data/.
Open Source Tools
This site uses uses a number of open source tools for which I'm very grateful to the following;