NEETS MOD 18 RADAR ASSIGNMENT 4
Terms
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- What is the normal source of dry air for a radar system?
- Ship's central dry-air system.
- What is the major difference between the electronics dry-air branch and the vital service lp air main?
- Degree of dehydration.
- What is the air control panel designed to control?
- Pressure.
- What type of cooling is used to control ambient room temperature?
- Air conditioning.
- A typical liquid-cooling system is composed of what loops?
- Primary and secondary.
- What loop of a cooling system is often supplied by sea water?
- The primary loop.
- The spectrum of a radar transmitter describes what characteristic of the output pulse?
- Frequency distribution.
- Where should the transmitter spectrum be located with respect to the receiver response curve?
- In the center.
- The ideal radar spectrum has what relationship to the carrier frequency?
- Symmetrical above and below the carrier frequency.
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The display screen of a spectrum analyzer presents a graphic plot of what two signal
characteristics? - Power and frequency.
- The peak power of a radar depends on the interrelationship of what other factors?
- Average power, pulse width, and prt.
- Transmitter power readings are most often referenced to what power level?
- 1 milliwatt.
- A loss of receiver sensitivity has the same effect on range performance as what other loss?
- Transmitter power loss.
- You determine receiver sensitivity by measuring the power level of what signal?
- Minimum discernible signal (mds).
- When measuring receiver sensitivity, what quantities must you add to the dBm reading obtained on the signal generator or test set?
- Attenuations of the directional coupler and the connecting cable.
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Receiver bandwidth is defined as those frequencies spread between what two points of the
receiver response curve? - Half-power points.
- The end of the usefulness of a tr tube is indicated by an increase in what quantity?
- Recovery time.
- Most shipboard distribution systems use ac power that has what number of phases?
- Three.
- How is emergency power applied when normal power is lost?
- Automatically.
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What device is used to switch power from the normal source to an alternate source for nonvital
users? - Manual bus transfer (MBT) unit.
- What procedure should you use when a power input to your equipment is missing?
- Work backwards from the load to the source.