Question

For communication from satellite to the earth station, microwave frequencies are used because:
1. Loss is minimum
2. Noise added to signal is low in this window
3. These do not get reflected back by ionosphere
4. Many channels can be used

Answer 1

Correct Answer - Option 4 : Many channels can be used

A microwave-based communication link has all the below-mentioned advantage over any other lower frequency based communication system.

1. Increased bandwidth

2. Increased secrecy

3. Ability to use high gain, high directivity antenna. 

As bandwidth is more hence more number of channels can be used.