^ a b High frequency (HF) is the band of radio frequencies from 3–30 megaHertz, or equivalently wavelengths from 100–10 meters.^ Amateur Radio Safety Foundation Inc., is an American public-benefit entity and 501(c)(3) non-profit organization.has written FCC Chairman Ajit Pai, other Federal Communications Commission members, and FCC administrators to correct inaccuracies in opponents' claims. The Board of Directors of the Amateur Radio Safety Foundation, Inc. Additionally, in response to the need for better disaster response communications in the mid to later part of the 2000s, the network was expanded to provide separate parallel radio email networking systems for MARS, UK Cadet, Austrian Red Cross, the US Department of Homeland Security SHARES HF Program, and other groups. During the late 1990s and late 2000s, it increasingly became what is now the standard network system for amateur radio email worldwide. Gateway stations have operated on sub-bands of HF since 2013 as the Winlink Hybrid Network, offering message forwarding and delivery through a mesh-like smart network whenever internet connections are damaged or inoperable. The system used to employ multiple central message servers around the world for redundancy, but in 2017–2018 upgraded to Amazon Web Services that provides a geographically-redundant cluster of virtual servers with dynamic load balancers and global content-distribution. It is well known for its central role in emergency and contingency communications worldwide. Winlink networking started by providing interconnection services for amateur radio (also known as ham radio).
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