a) Why are microwave repeaters needed? b) Does the uplink or the downlink use po

Question

a) Why are microwave repeaters needed?

                b) Does the uplink or the downlink use point-to-point transmission?

                c) What is the footprint?

                d) Which of the following uses dish antennas: GEOs, LEOs, or MEOs?

                e) Which of the following is good for mobile stations: GEOs, LEOs, or MEOs?

                f) What are the rough heights of GEO, LEO, and MEO orbits?

                g) What is a VSAT satellite dish?

                h) What is the attraction of VSAT technology?

Explanation / Answer

a. A tower equipped with a receiver and transmitter for picking up, amplifying, and passing on in either direction the signals sent over a microwave network by highly directional microwave beams. Also known as microwave link; microwave relay

c.The footprint of a communications satellite is the ground area that its transponders offer coverage, and determines the satellite dish diameter required to receive each transponder's signal. There is usually a different map for each transponder (or group of transponders), as each may be aimed to cover different areas.

b. uplink

d.GEO

e. GEO

g. A very small aperture terminal (VSAT) is a two-way satellite ground station or a stabilized maritime VSAT antenna with a dish antenna that is smaller than 3 meters. The majority of VSAT antennas range from 75 cm to 1.2 m.

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