Radio propagation

Microwaves are electromagnetic waves with wavelengths shorter than one meter and longer than one millimeter, or frequencies between 300 megahertz and 300 gigahertz. (UHF, SHF, EHF) Apparatus and techniques may be described qualitatively as "microwave"...

White Alice Communications System - Cold war era Alaskan tropospheric communications link

Tropospheric scatter

ACE High was a NATO communications system which dates back to 1956. The system was decommissioned in the late 1980s, and its frequencies reallocated for commercial radiotelephone service. The system was designed to be an L-band troposcatter radio system, which was meant to provide long-range communication service in the form of telephone and telegraph to NATO. These two services combined produced over two hundred channels, and equipment was in place to multiplex them to contain up to 12 different calls each. There were 82 stations, located in nine different NATO countries. The transmitters broadcast at 832.56 to 959.28MHz, and some were able to produce a transmitting power of about 10 Kilowatts.