When did the signal corps first test satellite communications?

The testing of satellite communications by the Signal Corps began on January 10, 1946, which marks a significant milestone in the development of satellite technology. This early experimentation provided foundational insights into how communications could be transmitted efficiently over long distances using satellites. The date is particularly notable because it occurred shortly after World War II, a time when advancements in technology were rapidly progressing. It laid critical groundwork for future developments in satellite communications and influenced the trajectory of military and civilian communication systems.

Other options do not represent the correct timing of the Signal Corps' initial tests. The activities testing satellite communications did not begin in 1945, as technology was still primarily focused on conventional communications methods at that time. The subsequent years, including 1947 and 1948, saw further developments and advancements, but the specific initiation of testing by the Signal Corps occurred in 1946.