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Vol 2 > review > Flashcards

review Flashcards

1
Q

What type of radar provides critical information to provide ample time to prepare or evacuate in response to natural disturbances?

A

Weather

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2
Q

The time from one pulse to the next that the radar sends out is called

A

PRT

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3
Q

Which radar subassembly amplifies the weak, electromagnetic (EM) pulses returned from the reflecting object and reproduces them as video pulses?

A

Receiver

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4
Q

What controls the radar pulse width (PW) by means of a rectangular direct current (DC)?

A

Modulator

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5
Q

In addition to a flat top, what characteristics must a modulator pulse have?

A

Very steep leading edge and trailing edge

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6
Q

What type of modulator is most commonly used in modern radar systems?

A

Line-Pulse

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7
Q

What type of tube best meets the requirements of a modulator-switching element?

A

Thyratron

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8
Q

If the magnetic field strength is too high on the magnetron, the magnetron will

A

not oscillate

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9
Q

The power gain of an antenna is the ratio of its radiated power to

A

Reference dipole

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10
Q

Which pattern is usually specified and measured for a reciprocal antenna?

A

Transmit

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11
Q

What is the most common reflector shape?

A

Paraboloid

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12
Q

What do you call the use of contiguous beams stacked in elevation?

A

Stacked Beam radars

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13
Q

What is an advantage of the individual pencil beams when handling rain clutter or chaff?

A

Limits the volume of space observed

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14
Q

Which array is particularly useful in radar applications?

A

Two-dimensional planar

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15
Q

Which waveguide antenna is more suited for one-dimensional scanning then scanning in two coordinates?

A

Waveguide slot array

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16
Q

What intermediate frequencies are usually used in radar receivers?

A

30MHz or 60MHz

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17
Q

What receiver circuit/stage actually produces the intermediate frequency (IF)?

A

Mixer

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18
Q

Which stage of the intermediate frequency (IF) section is the most critical?

A

Input Stage

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19
Q

Immediately after the transmitter fires, sensitivity time control (STC) reduces the receiver gain to what level?

A

0

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20
Q

What signal is used to synchronize the coherent oscillator (COHO) to a fixed phase relationship with the transmitted pulse?

A

Coherent oscillator lock pulse

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21
Q

What is the phase relationship between the delayed and non-delayed video?

A

Opposite Polarity

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22
Q

What happens to the overall gain of a linear logarithmic (LIN-LOG) amplifier as each stage saturates?

A

Gain Decreases

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23
Q

How many separate channels does a monopulse receiver have?

A

3

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24
Q

What is used to interface target and weather channel signals to the signal processor?

A

Azimuth beam/sensitivity time control (STC) interface

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25
Q

What unitā€™s primary function is to accept the output of the receiver/exciter (REX), and decide, for every range and azimuth cell in the radar coverage area, whether a moving target is present or not?

A

Target processor

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26
Q

How many permanent echoes are permitted by the advanced signal data processor (ASDP)?

A

25

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27
Q

What processor function attempts to correlate plots to existing tracks?

A

Track processor

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28
Q

What type of reflector is used to shape the radar beam?

A

Parabolic

29
Q

What refers to the orientation of the electromagnetic (EM) wave as it travels through space?

A

Polarization

30
Q

What refers to the motion of the antenna axis (of the beam) as the radar looks for an aircraft?

A

Scanning Method

31
Q

What precision radar system uses continuous rotation of a pencil beam (narrow angle in both dimensions) around the aircraft and uses the phase of the return signal modulation to maintain track in both azimuth and elevation?

A

Conical Scan

32
Q

When using a conical scan, what component of the return signal modulation is used by the radar system to maintain track in both azimuth and elevation?

A

Phase

33
Q

What scanning method is identified at the electronic countermeasure (EXM) receiver by its regular intervals between illuminations?

A

Circular

34
Q

Which radar gets its name from the fact that each pulse from the aircraft being tracked yields a new azimuth and elevation correction angle?

A

Monopulse scan

35
Q

What happens to the speed of the electromagnetic (EM) energy traveling through air as the altitude increases?

A

Signal speed increases

36
Q

The bending of electromagnetic (EM) waves caused by a change in the density of the medium through which the waves are passing is referred to as what?

A

Refraction

37
Q

What is it called when temperature first increases with height then begins to decrease?

A

Temperature inversion

38
Q

What do you call propagation of a wave from one point to another by more than one path?

A

Multipathing

39
Q

What radar unit displays corresponding radar information on a cathode ray tube (CRT)?

A

Indicator

40
Q

What type of cathode ray tube (CRT) is mostly used in ground radar equipment?

A

Electromagnetic (EM)

41
Q

The most basic type of scanning indicator is the

A

A

42
Q

The scanning indicator that plots target range and azimuth information in polar coordinates is the

A

Plan Position Indicator (PPI)

43
Q

What type of scanning indicator do surveillance radars primarily use?

A

Plan Position Indicator (PPI)

44
Q

What type of scanning indicator completes two vertical scan periods to produce one complete picture called a frame?

A

Raster

45
Q

Which indicator power supply furnishes the cathode ray tube (CRT) operating voltages?

A

High voltage

46
Q

Along with determining the overall operation of the indicator, the data processing circuits provide what?

A

Provide data distribution and interface with the radar

47
Q

What indicator circuit converts digital display data from the data processing circuits into analog drive signals?

A

Deflection

48
Q

What part of the cathode ray tube (CRT) is tapered and line with a conductive graphite coating?

A

Aquadag

49
Q

The high vacuum and large surface area of the cathode ray tube (CRT) make it especially vulnerable to?

A

Implosions

50
Q

Which is not an advantage of identification friend or foe/selective identification feature (IFF/SIF) equipment?

A

Only one mode is used for simplicity

51
Q

An aircraft transponder answers an interrogation by transmitting a reply pulse train signal back to the ground station at a frequency of

A

1090 MHz

52
Q

To eliminate interrogator side-love suppression (ISLS), the ground radar site transmits the P2 signal in what type of radiating pattern?

A

Omnidirectional

53
Q

What selective identification feature (SIF) mode has a limit of 32 codes?

A

1

54
Q

What generates an identification of position (I/P) reaponse?

A

Aircraft pilot

55
Q

What is the only type of aircraft that can present a single-arc identification friend or for (IFF) reply on a scope?

A

Military

56
Q

A 7600 emergency reply signifies an aircraft

A

Communications failure

57
Q

What function of the AN/UMP-155 test set provides overall control of the other functions?

A

Interface and Control

58
Q

What are used to couple waveguide components and sections to prevent radio frequency (RF) leakage?

A

Choke joints

59
Q

What do most radars use in their waveguide system to prevent arcing?

A

Air compressors

60
Q

What waveguide compressor subsystem controls operation of airflow and indicates normal or malfunction conditions?

A

Electrical

61
Q

What duplexer sub-component accept radio frequency (RF) transmit power from the transmitter and directs it through the waveguide to the antenna assembly?

A

Circulator

62
Q

What waveguide component has a mechanical stop mounted on its base to limit movement to each extremity of travel?

A

Radio frequency (RF) switch

63
Q

Due to high signal loss, about how many feet are coaxial cable remoting systems limited to?

A

12,000

64
Q

How many microseconds (us) does it take radio frequency (RF) to travel one radar mile?

A

12.36

65
Q

What does the ā€œPā€ in GPN-30 designate?

A

Radar

66
Q

The two most often used radar remoting configurations are

A

Cable/land lines and radio microwave links

67
Q

What antenna device reduces precipitation display to nearly zero on an indicator?

A

Polarizer

68
Q

What function of the AN/UPM-155 test set provides signal conditioning required for testing transponders and interrogators?

A

Interface

Vol 2 (1 decks)

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