213-19.Why do satellite earth terminals requirehighly sensitive receivers?1.To overcome the down-link powerlosses2.To permit extraction of the desiredcommunications information from thereceived signal3.Both 1 and 2 above4.Because of the signal scatter effect ofthe antennas3-20.Which of the following functions isperformed by the exciter stage of an earthterminal transmitter?1.Modulation of the IF carrier2.Translation of the IF signal to the up-link frequency3.Amplification of the IF signal to thelevel required by the receiver4.Conversion of the down-linkfrequency to an IF3-21.Telemetery equipment used in satellitecommunications systems performs whichof the following functions?1.They monitor the operatingconditions within the satellite2.They provide local control forsatellite operations3.They furnish high-capacity wide-bandtty trunks4.They measure ambient weatherconditions3-22.A typical shipboard receive-only satellitesystem uses which of the following typesof modulation?1.Pulsed or amplitude2.Pulsed or frequency3.Amplitude or phase-shift-key4.Frequency or phase-shift-key3-23.Locating a near-synchronous satellite israther simple for which of the followingreasons?1.It is stationary2.It is moving north to south3.It has a slow relative motion4.It has a fast relative motion3-24.What is the name of the table thatprovides coordinates of a satellite atspecific times?1.Bearing location2.Longitudinal3.Propagation4.Ephemeris3-25.To establish radio contact with a satellite,an earth terminal must know which of thefollowing satellite data?1.Attitude2.Elevation3.Operating speed4.Angle of inclination3-26.Satellite down-link frequency variationsoccur most often from satellites in whichof the following orbits?1.Low altitude elliptical2.Medium altitude circular3.High altitude synchronous4.Superhigh altitude near-synchronous3-27.Of the following terms, which onedescribes the period of time required forone earth terminal to yield control of asatellite to another?1.Slewing2.Hand over3.Control shift4.Terminal continuity
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