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21 Cards in this Set
- Front
- Back
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What is the normal source of dry air for a radar system?
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Ship's central dry-air system.
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What is the major difference between the electronics dry-air branch and the vital service lp air main?
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Degree of dehydration.
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What is the air control panel designed to control?
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Pressure.
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What type of cooling is used to control ambient room temperature?
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Air conditioning.
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A typical liquid-cooling system is composed of what loops?
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Primary and secondary.
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What loop of a cooling system is often supplied by sea water?
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The primary loop.
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The spectrum of a radar transmitter describes what characteristic of the output pulse?
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Frequency distribution.
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Where should the transmitter spectrum be located with respect to the receiver response curve?
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In the center.
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The ideal radar spectrum has what relationship to the carrier frequency?
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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.
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The peak power of a radar depends on the interrelationship of what other factors?
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Average power, pulse width, and prt.
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Transmitter power readings are most often referenced to what power level?
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1 milliwatt.
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A loss of receiver sensitivity has the same effect on range performance as what other loss?
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Transmitter power loss.
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You determine receiver sensitivity by measuring the power level of what signal?
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Minimum discernible signal (mds).
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When measuring receiver sensitivity, what quantities must you add to the dBm reading obtained on the signal generator or test set?
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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.
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The end of the usefulness of a tr tube is indicated by an increase in what quantity?
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Recovery time.
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Most shipboard distribution systems use ac power that has what number of phases?
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Three.
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How is emergency power applied when normal power is lost?
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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.
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What procedure should you use when a power input to your equipment is missing?
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Work backwards from the load to the source.
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