Changes

:* '''Complexity point-of-view:''' Complexity depends on distance, data rates and number of different signals required. For example, communication satellites are very complicated because of high data rates required and altitude of 36000 km. Longer distances lead to more attenuation, and higher data rate translates to greater power requirement as you will infer from [[Link Budget]].

# '''Ground-Station:''' It receives the satellite signal and transmits the control signals to the satellite. On ground, the biggest advantage is liberty and flexibility since there are no rigid size or area constraints. The objective is to reliably receive from and transmit to satellite irrespective of satellite’s current state or weather. The variety in Ground-station setups can be seen from the fact that International Space Station (ISS) reception does not require specialised antennae, whereas deep space missions require GMRT that can go upto the size of football fields. The huge difference in the two above setups is that one receives signals from more than 10000 km away and the other receives it from just 400 km.

[[File:Handheld.jpg|right|frame|ISS tracking using handheld transceiver]]