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High Frequency Propagation Models Disclaimer: The software contained within was developed by an agency of the U.S. Government. NTIA/ITS has no objection to the use of this software for any purpose since it is not subject to copyright protection in the U.S. No warranty, expressed or implied, is made by NTIA/ITS or the U.S. Government as to the accuracy, suitability and functioning of the program and related material, nor shall the fact of distribution constitute any endorsement by the U.S. Government.

Notice: The Department of Commerce has made this HF propagation software available free of charge, as is from these web pages. Please understand there is no general funding to assist the users of this software. Users desiring program enhancements and modifications should read the information provided under Software Modifications.

Software Modifications: If you require software changes to meet your needs, a mechanism now exists where you can easily fund the work to be done. Please view the generic Software Development CRADA to see the boilerplate agreement. Requests to modify the ITS HF Propagation Models should be made to: Chris Behm, Email: cbehm@its.bldrdoc.gov, Phone: (303) 497-3640.

View the News files that detail the changes made for each version of the software. (Since Dec 1992) The following HF propagation models for Windows PCs are available from NTIA/ITS: HFWIN32 - (05.0119W) Windows-NT/2000/XP & 95/98/ME 32-bit versions of ICEPAC / VOACAP / REC533 Now (2Feb04) using Tarma Installer ©. Updated with new compiler, much faster than 99.0201 or previous versions. HFCC.zip - Antennas used by the ITU & HFCC These antennas are useful for HF Broadcasters and their coordination meetings. ICEPAC is IONCAP with ICED profile model developed by NTIA/ITS. VOACAP is IONCAP modified by USIA/VOA for broadcasting. Get source of VOACAP here. REC533 is the ITU-R PI.533 model for international HF planning. Get source of REC533 here. readme.txt file describes installation and registration procedures.

Other useful links: Join the VOACAP Mailing List. VOACAP Quick Guide - by Jari Perkiomaki (Finland). www.voacap.com - a website for VOACAP maintained by Jari. Space Environment Center for real-time monitoring/forecasting of solar & geophysical events. Ionosphere Home Page from the National Geophysical Data Center. Ionospheric indices information. The HFCC (High Frequency Co-ordination Conference) informally coordinates short wave broadcasting. IBB - International Broadcasting Bureau (VOA, RFE,...) ARRL - National Association for Amateur Radio. Contact: Christopher Behm, Email: cbehm@its.bldrdoc.gov, Phone: 303-497-3640

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