Satellite communications can be considered to take its first steps
with the launch of the first man-made satellite, Sputnik
I, which was launched by Russia on 4 October 1957.Sputnik was an 84-kg, 58-cm sphere launched into an orbit
between 231 km and 942 km. Although not used directly
for satellite communications, Sputnik transmitted telemetry information for 21
days on 20 MHz and 40 MHz.
Other topics in our resources on Satellite Communications related to Sputnik include: