What are the uplink and downlink frequency of stratellite..plz give me information immediatly

uplink and downlink frequency of stratellite

What are uplink and downlink?

The communication going from a satellite to ground is called downlink, and when it is going from ground to a satellite it is called uplink. When an uplink is being received by the spacecraft at the same time a downlink is being received by Earth, the communication is called two-way. If there is only an uplink happening, this communication is called upload. If there is only a downlink happening, the communication is called one-way.

DS1 has a constant downlink going to Earth sending little bits of information. However, most of the communication is done two-way with the Deep Space Network.

1) On the Earth Station we have to penetrate the atmosphere to reach the satellite station..so we need a lot of power to be generated...This is only possible with the help of High power transmitter circuits....which cannot be installed on the satellite....so uplink is at higher freq with higher power.

2)Now as the frequency is increased the amount of interference caused by the atmosphore reduces...as higher frequency signal has more signal energy in it....so it can penetrate the atmosphere more easily...(the same reason why we use modulation with higher frequency)

3) Unwanted distortion like rain (main cause of attenuation), fog, other frequency in neighbourhood, etc cause distortion....so we have to count to these factors and increase the frequency band to 100-1000Ghz range...

Now the Satellite is a small piece of equipment and needs to be light weight...so it cannot have high power amplifiers on board so by default the freq is lower than uplink...