The following items will test your grasp of the material covered in this lesson. There is only one correct answer
for each item. When you complete the exercise, check your answers with the answer key that follows. If you
answer any item incorrectly, study that part of the lesson which contains the portion involved.
An integrated communications system that covers a large area contains local lines, equipment loops, long-
distance trunks, and tributary lines. Communications systems using satellite links are normally used as-
The antenna of a ground terminal in a communications satellite system must track the satellite in its
movement across the sky. Many of the technical problems associated with this operation can be largely
eliminated by using satellites in what kind of orbits?
Assume that the ground terminals of a satellite communications system are in contact through an orbiting
satellite. As the ground terminal antennas track the satellite in the direction of the sun, the operators
A signal fade due to increasing density of ionization
An increase of thermal background
An increase of satellite power output
Which reason indicates that FM is preferred to AM in satellite communications systems?
FM requires less output power than AM
FM minimizes the effect of noise peaks
FM operates at higher frequencies than AM