Satellite systems have been in place for many years and serve a variety of appli

Question

Satellite systems have been in place for many years and serve a variety of applications, including: Among the favorable characteristics of satellites for communication is their "ubiquity." This means that satellite signals can a. be seen from a fixed position on earth b. offer one meter image resolution c. be received everywhere d. be treated as an on demand service The spectrum made available by the ITU for Digital Audio Broadcasting (Digital Audio Radio Services) is in which band? a. L-Band (1-2 GHz) b. S-Band (2-4 GHz) c. both of these d. neither of these The spectrum assigned for video transmission to small dishes located for residential use is in which band? a. S-Band (2-4 GHz) b. Ku-Band (4-6 GHz) c. Ku-Band (12-14 GHz) A solution to spectrum scarcity in satellite communications is a. frequency re-use b. digital compression c. both a and b d. neither a or b

Explanation / Answer

3) c)Ubiquity of satellites means that signals can be received anywhere on the earth.....this is how live telecasts of a cricket or football match can be made to all parts of the world via satellites.

4)a)L band is used in this case. This is the radio spectrum and used for GPS, audio and very very low quality video transfer.

5) a) S band is used primarily for residential video transmission. However, if high quality video is requied(for military and state purposes) then Ku band is used.

6) a) Frequency reuse means that the satellites transmits signals to many stations at the same frequency range. They transmit narrow frequency beams towards each of these stations instead of broadcasting it throughout.

Digital compression is an upcoming field. It is still in experimental area and hence not widely used.

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