1-11. 1-12. 1-13. 1-14. 1-15. 1-16. Which of the following radar units converts the video output of the receiver to a visual display? 1. Duplexer 2. Modulator 3. Antenna 4. Indicator Which of the following radar units ensures  that  all  subsystems operate in a definite time relationship? 1. Duplexer 2. Modulator 3. Antenna 4. Indicator Which of the following radar units converts the echo to an intermediate   frequency? 1. Duplexer 2. Antenna 3. Indicator 4. Receiver Which of the following characteristics   influence(s)   radar range  performance? 1. Height  of  antenna 2. Peak  power  of  the  transmitted pulse 3. Receiver sensitivity 4. All of the above Which  of  the  following  external characteristics   influence(s)   radar performance? 1. Darkness 2. Rain 3.   PMS 4. Both 2 and 3 above Which  of  the  following  methods should you use to do a radar surface  angular  measurement? 1. Measure  counterclockwise  from true  north 2. Measure  clockwise  from  true north 3. Measure  clockwise  from  the heading line of the ship 4. Both 2 and 3 above 1-17. 1-18. 1-19. 1-20. 1-21. To determine if an echo is a false target or a true target, what radar  characteristic  should  you change? 1.   PW 2. STC 3.   PRR 4.   RPM Which of the following radar reference  coordinates  is  an imaginary  plane  parallel  to  the earth’s  surface? 1. Horizontal  plane 2. Vertical  plane 3.   Los 4. Relative  bearing Which of the following radar reference  coordinates  is  a  line from the radar set directly to the object? 1. 2. 3. 4. Horizontal  plane Vertical  plane LOS Relative  bearing Which  of  the  following  radar reference  coordinates  is  the  angle measured  clockwise  from  true  north in the horizontal plane? 1. Relative  bearing 2. Elevation  angle 3. True  azimuth  angle 4. Vertical  plane Which  of  the  following  radar reference  coordinates  is  the  angle measured  clockwise  from  the centerline of a ship or aircraft? 1. Relative  bearing 2. Elevation  angle 3. Azimuth  angle 4. True  bearing 2