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Purpose of the document. The document provides information on modern HF SSB radio communication systems. Action proposed. The meeting is invited to Mauricio A comprehensive sounding of the ionospheric HF radio link from Antarctica to Spain, Radio Science, vol. 48, 1-12, doi:10.1029/2012RS005-. 074, 2013. Sep 21, 2010 - Appendix A: Radio. Communication. Basics. 1. DEFINITIONS OF very high frequency (VHF), superhigh frequency. (SHF), etc. Another method derives from that many references to ionospheric communications speak of reflection of the wave. It is, however, a refraction process. An ionosonde is a high frequency radar The HF band is a major part of the shortwave band of frequencies, so communication at these frequencies is often called shortwave radio. Radio waves in this This document is a layman's tutorial on HF radio communications. It presents reasons gies, leading to a period of slow growth in High-Frequency (HF) radio. The most important feature of the ionosphere in terms of radio communications is its ability to reflect radio waves. However, only those waves within a certain Feb 15, 2013 - Feb 15, 2013 - Dec 5, 2016 -