Earth-Moon-Earth Communication is a method of radio communication that uses the Ultra High
Frequency (UHF) band to bounce signals off the Moon and back down to Earth, allowing signal
transmission around the world. It was first discovered by U.S. Navy radar technicians. EME is
favored over other weak signal radio methods due to its reliability and longer reach. However,
many amateur radio operators are discouraged from EME due to its tendency to use large costly
antenna arrays and expensive radio systems. While EME communication is possible on many
bandwidths, the 70cm (432 MHz) band is widely recognized as the most effective frequency
range due to its low levels of signal loss and small wavelength.
The purpose of this study is to develop a complete portable system to facilitate long distance
communication via the weak signal mode, Earth-Moon-Earth Transmission (EME). EME setups
traditionally require large antenna arrays with manual rotation systems used to align the forward
end of the array with the Moon. [1] The development of this system would allow for near
autonomous transmissions, by tracking the Moon using a dual axis rotation system. It would also
allow for long distance communication to be accomplished in locations where standard antenna
systems can’t operate efficiently. This project aligns itself with NASA Mission Directorate A.2:
Human Exploration & Operations Mission Directorate (HEOMD), falling under the subcategory
of space communication and navigation. This system could also provide a new method of
emergency communication for the West Virginia University Amatuer Radio Club.
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