E1D04 (A) [97.3]
What is an Earth station in the amateur satellite service?
A. An amateur station within 50 km of the Earth's surface intended for communications with amateur stations by means of objects in space
B. An amateur station that is not able to communicate using amateur satellites
C. An amateur station that transmits telemetry consisting of measurement of upper atmosphere data from space
D. Any amateur station on the surface of the Earth
