3D1X5 Volume 2 (URE)

1. Siting a precision approach radar (PAR) for multiple runway approaches can cause you to locate the unit outside the optimum coverage areas. If this occurs what would be the best location for the radar system?

No location is best; do not install the PAR

At the center point between runway overruns

A position where it gives limited coverage to all of your runways

A position where it gives the best coverage to your most important runway

2. Radio frequency (RF) to the antenna makes the transition from fixed to rotating waveguide within the

Rotary joint

Slip rings

Polarizers

Feedhorn

3. What identifies and blanks returns from targets beyond the operating range of the radar?

Phase detector

Coherent canceller

Analog to digital converter

Second-time-around reduction circuits

4. Once a track is established in the AN/GPN–22 precision approach radar (PAR), what device uses error data obtained from the received signal to predict where the target will be during the next track interval?

Target Data Computer (TDC)

Signal Data Converter (SDC)

Computer Data Entry Module (CDEM)

Antenna Beam Position Control Unit (ABPCU)

5. What capability makes the traveling wave tube (TWT) much more versatile than the magnetron?

It is a remarkably stable oscillator

It is a wide band amplifier and not an oscillator

It is far more efficient at using repeller plate potential

Its narrow bandwidth provides unsurpassed frequency stability

6. In the AN/GPN–22 precision approach radar (PAR), the non-coherent mode of operation is used to

Cancel slow moving targets

Cancel the presence of rain only

Detect the outline of weather only

Detect a target in the presence of moving clutter such as rain

7. The airport surveillance radar (ASR) is used in which air traffic control (ATC) radar mission?

Local control

Terminal control area

Air route traffic control

Precision approach radar control

8. On the AN/GPN–22 precision approach radar (PAR) radar set controls (RSC), an "OVER TEMP" fault lamp indicates

Insufficient cooling

Excessive current draw

Excessive voltage production

Excessive current draw or insufficient cooling

9. In the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR), which of the following best describes the fault hierarchy for the automatic fault testing?

The last module on the chain is tested first

The testing is randomly selected by the TDC

Modules are prewired to a fixed testing sequence

Modules that affect the testing of others are tested first

10. What is used to regulate the output of the AN/GPN–20 airport surveillance radar (ASR) transmitter's high voltage power supply?

Positive feedback loop

Negative feedback loop

Conduction time of six silicon controlled rectifiers (SCRs)

Conduction time of only three diodes

11. In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is accomplished by transmitting two 1 microsecond (μsec) pulses that are composed of two X-band frequencies separated by

24 MHz

37 MHz

74 MHz

124 MHz

12. At what interval does the AN/GPN–22 precision approach radar's (PAR) target data computer (TDC) perform system fault monitoring?

Every pulse recurrence time (PRT)

Once every 2 seconds

Once per track interval

At beam interrupt signal time

13. In the AN/GPN–22 precision approach radar (PAR), the data loop interface logic circuitry used in each of the subsystems is commonly called

One’s complement

Repeater logic

Closed-loop

Open-loop

14. All of the front panel switches in the special test section of the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR) are disabled during normal operation except for the

LN/LM switch

Beam width switch

Preamplifier switch

Transmitter frequency switch

15. The primary function of the refresh memory (RM) in the precision approach radar (PAR) indicator system is to

Clear the indicator when overloaded

Allow new data to be entered during operation

Allow the indicator to be reset during operation

Maintain a flicker-free presentation for the display

16. In the AN/GPN–22 precision approach radar (PAR), what are the three modes of operation with respect to data loop operation?

Command, open-loop, closed-loop

Diagnostic, operational, coherent

Data point, closed-loop, self-test

Command, input, and output

17. The AN/GPN–20 airport surveillance radar (ASR) provides emergency obstruction light operation for a minimum of

30 seconds

10 minutes

30 minutes

10 hours

18. The time necessary to quickly disconnect the transmitter and connect the receiver to the antenna is called

Transmitter/receiver (TR) recovery time

Transmitter recovery time

Processor recovery time

Receiver recovery time

19. How will the final optimum tilt angle for the AN/GPN–20 airport surveillance radar (ASR) antenna be determined?

Survey only

Line of sight only

Survey and flight check

Line of sight and survey

20. The AN/GPN–22 precision approach radar (PAR) required input voltage is 3-phase,

110 volt, alternating current (VAC)

110 volt, direct current (VDC)

208 VAC

208 VDC

21. What receiver parameter does minimum discernable signal (MDS) check?

Balance

Receiver sensitivity

None, it is a transmitter test

Voltage standing wave ratio (VSWR)

22. What is the primary advantage of having two operator keyboards for each control indicator group?

Provides a backup keyboard in the event of master indicator keyboard failure

Enables the lead controller to override a trainee’s incorrect data entry during routine air traffictraining

Enables the on-duty chief controller to invoke system inquiries without encroachment to thedrop/suspend list priority

Enables one controller to “work” active traffic and the remaining controller to perform flightdata entry/modification, handoffs, etc

23. The target data computer in the AN/GPN–22 precision approach radar (PAR) processes the site parameter panel data once

Every track interval

Per scan interval

Every 2 seconds

Per second

24. In the AN/GPN–22 precision approach radar (PAR), the stabilized master oscillator (STAMO) multiplies the continuous wave (CW) transmitter drive signal to the

L-band

S-band

W-band

X-band

25. In the scan mode, the AN/GPN–22 precision approach radar (PAR) can direct the radio frequency (RF) beam to how many separate beam positions?

443

439

423

421

26. What is a measure of the ability to detect a small moving target in ground clutter?

Stationary cancellation velocity

Sub-cancellation velocity

Sensitivity time control

Subclutter visibility

27. For how many minutes is the AN/GPN–20 airport surveillance radar (ASR) control memory energized by the temporary power supply when a power failure occurs?

10

15

20

25

28. Azimuth resolution is directly related to what radar set characteristic?

Pulse recurrence frequency

Transmitted pulse width

Pulse recurrence time

Antenna beam width

29. The point designated as touchdown for a precision approach radar (PAR) is normally how many feet from the end of the runway?

500 exclusive of any overruns

500 inclusive of any overruns

1,000 exclusive of any overruns

1,000 inclusive of any overruns

30. The AN/GPN–20 airport surveillance radar (ASR) primary power input is 3-phase,

110 volts alternating current (VAC)

120 volts direct current (VDC)

120/208 VAC

110/208 VDC

31. The airport surveillance radar transmitter site should be located more than ½ mile from the primary instrument approach path and touch-down point so that these areas

Fall within receiver recovery time

Fall within processor recovery time

Do not fall within receiver recovery time

Do not fall within processor recovery time

32. Which converter is used in both the AN/GPN–22 precision approach radar (PAR) shelter and radar approach control (RAPCON) remoting equipment to convert the parallel 32-bit data words to serial data and back again?

Digital-to-digital (D/D)

Analog-to-digital (A/D)

Digital-to-analog (D/A)

Analog-to-analog (A/A)

33. After initial turn-on, what is the recommended warm-up period for the AN/UPM–145 Radar Test Set before performing any tests?

None

5 minutes

10 minutes

24 hours

34. In dual frequency diversity mode, the overall AN/GPN–20 airport surveillance radar (ASR) system timing is derived from the

Selected master channel

Individual channel’s processors

Selected master stable local oscillator

Individual channel’s stable local oscillator

35. To change the AN/GPN–20 airport surveillance radar (ASR) receiver stable local oscillator (STALO) frequency you must

Manually tune the resonate oscillator

Change the internal very high frequency (VHF) oscillator crystal

Manually adjust the reflex klystron repeller voltage

Change the capacitors of the voltage controlled oscillator

36. How many narrow band filters does the AN/GPN–22 precision approach radar (PAR) employ to convert a shift in intermediate frequency (IF) to a range error signal?

24

37

74

137

37. AN/GPN–22 precision approach radar (PAR) emergency power is supplied by a

12-volt, alternating current (VAC) battery

12-volt, direct current (VDC) battery

110-VDC battery

208-VDC battery

38. What is the original source of the continuous wave (CW) radio frequency (RF) drive in the AN/GPN–22 precision approach radar (PAR)?

37-megahertz (MHz) crystal oscillator

74-MHz crystal oscillator

Stable local oscillator

Local oscillator

39. The purpose of the traveling wave tube (TWT) radar modulator A6 in the AN/GPN–22 precision approach radar (PAR) transmitter is to

Provide voltage amplification and trigger shaping to the TWT modulator trigger

Produce excitation voltage for the cathode of the TWT modulator trigger

Modulate the incoming video for conversion to intermediate frequency (IF)

Provide pulse shaping for stable master oscillator

40. In the AN/GPN–22 precision approach radar (PAR) remoting system, which channel is not remoted to the radar unit?

Voice

Digital

Analog

Video/triggers/data

41. In remoting signals, line attenuation is greatest at the

Higher frequencies

Intermediate and higher frequencies

Lower frequencies

Intermediate and lower frequencies

42. What effectively eliminates moving target indicator (MTI) blind speeds at the speeds seen in air traffic control?

Staggered pulse repetition frequency (PRF)

Non-staggered PRF

MTI second-time-around reduction circuits

Normal second-time-around reduction circuits

43. Blind speed is a target speed at which successive radar returns changes phase by

45

90

135

180

44. In the programmable indicator data processor (PIDP) II, what service does the low-altitude alerting system perform?

It transfers low-altitude information related to specific tracked targets to receiving centersthroughout the controlled airspace

It warns the operator whenever tracked targets within the drop/suspend parameter drop below apredetermined altitude

45. In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is used in the scan mode to eliminate

Weather returns

Large target fluctuations only

Large target fluctuations and weather returns

Large target fluctuations and provide target enhancement

46. Which of the following is an off-line test performed on the antenna position control unit (APCU) in the AN/GPN–22 precision approach radar (PAR)?

Mode control

Open loop

Closed loop

Rebound

47. The AN/GPN–22 precision approach radar's (PAR) transmit/receive (T/R) section

Filters out unwanted frequencies

Provides amplification of the transmitted pulse

Produces the second intermediate frequency

Prevents receiver damage by the transmitter high-power pulse

48. In single cancellation, what happens to the pulse train after it is time-aligned with the next range scan?

The second range scan is added to the first

The signal bit is removed from the digital word

The second range scan is subtracted from the first

The magnitude information is extracted from the pulse train

49. The output voltage adjustment for the AN/GPN–20 airport surveillance radar (ASR) high voltage power supply is located

On the high-voltage power supply rectifier circuit card

On the high-voltage power supply regulator circuit card

Behind the transmitter front panel control assembly

On the transmitter front panel

50. A diplexer enables the use of two

Antennas with one transmitter

Frequencies through one receiver

Frequencies with one transmitter

Operating systems with one antenna

51. A phase detector that produces a large change in output voltage for a small change in input signal phase will

Have poor moving target visibility

Have good moving target visibility

Probably use a balanced beam detector

Probably use a split “T” phase detector

52. In the AN/GPN–20 airport surveillance radar (ASR) video processor, either log or normal video is selected for input in to the moving target indicator (MTI)/normal enhancer circuit by the

Normal log fast time constant (FTC) card

Normal video combiner

Normal video switch

Log video is switch

53. When off-line is selected on the digital bright radar indicator tower equipment's (DBRITE) digital scan converter (DSC) control panel, what mode is available for presentation?

Built-in tests

Target identification

Range mark selection

Synthetic display of alphanumeric data

54. What type of information does selective identification feature (SIF) Mode C reply represent?

Range

Identity

Altitude

Azimuth

55. In the AN/GPN–22 precision approach radar (PAR), the coherent and non-coherent input to the moving target indictor (MTI) detector is outputted as

Unipolar video

Bipolar video

Canceled unipolar video

Canceled bipolar video

56. The most common method of modulation used in remoting is

Amplitude modulation (AM)

Frequency shift keying (FSK)

Pulse code modulation (PCM)

Sideband

57. In the remoting section of the AN/GPN–22 precision approach radar (PAR), what is the purpose of the line driver equalizer circuits?

Fixes the input level flatness

Compensates for amplitude losses

Provides the required current output

Frequency compensates the response for cable length

58. The precision approach radar (PAR) indicator system indicates an aircraft's

Elevation only

Range and azimuth

Elevation and range

Elevation, range, and azimuth

59. In the precision approach radar (PAR) indicator the top presents elevation versus

Range data and the bottom half presents azimuth versus range

Azimuth data and the bottom half presents azimuth versus range

Range data and the bottom half presents azimuth versus elevation

Azimuth data and the bottom half presents azimuth and elevation

60. What should be the basis for adjusting the intermediate frequency (IF) gain in the AN/GPN–20 airport surveillance radar (ASR)?

Black hole video

Signal-to-noise ratio

Minimum video limiting

Barely visible “grass” on the indicator

61. What AN/TPX–42A air traffic control identification friend or foe/selective identification feature (IFF/SIF) component generates mode interrogation triggers?

Coder-synchronizer

Interference blanker

Receiver/transmitter

Transfer switching drawer assembly

62. Which switch on the AN/TPX–42A interrogator set control (B-box) determines how long the video signal processor (VSP) is allowed to process video?

Interrogator-receiver (IR)/1, IR/2

DEFRUIT ON

RANGE SELECT

PULSE-WIDE STANDARDIZER

63. In the event of a power loss the uninterruptible power supply is capable of operating the entire programmable indicator data processor (PIDP) II OL–475 equipment rack for period of how many minutes?

2

3

5

10

64. The AN/GPN–20 airport surveillance radar's (ASR) normal intermediate frequency (IF) amplifier provides IF

Amplification and bandpass filtering

Amplification, bandpass filtering, and video cancellation

Amplification , bandpass filtering, video detection, and video amplification

Amplification, bandpass filtering, video cancellation, and video amplification

65. The precision approach radar (PAR) indicator system displays the decision height cursor

In azimuth only

In azimuth and elevation

Along the elevation glidepath

Only when selected in azimuth

66. What AN/GPN–20 airport surveillance radar (ASR) meter is a good indicator of the transmitter output power?

High-voltage power supply current

High-voltage power supply

Magnetron high voltage

Magnetron current

67. What is the ideal horizontal beam width for the AN/GPN–20 airport surveillance radar (ASR) antenna at the half power point?

0.5 degrees

1.0 degrees

1.5 degrees

2.0 degrees

68. A passive feedhorn is used to achieve greater control over

High-altitude “holes”

Received ground reflections

Low-altitude gaps and coverage

Clutter caused by severe weather

69. The maximum amount of landline allowed between the AN/GPN–20 airport surveillance radar (ASR) and operations sites is

1,000 feet

1,200 feet

10,000 feet

12,000 feet

70. In the AN/GPN–22 precision approach radar (PAR), the operational program is locked to the real-time radar operations by the interrupt command signal from the

Dual channel receiver processor

Antenna beam position unit

Radar data transfer group

Refresh memory

71. As the range increases, the sensitivity time control (STC) attenuation in the AN/GPN–22 precision approach radar (PAR) is stepped down in what increments?

3 dB

6 dB

10 dB

12 dB

72. Most moving target indicator (MTI) phase detectors are designed to develop a

Trapezoidal output characteristic

Sinusoidal output characteristic

Triangular output characteristic

Flat-line output characteristic

73. The master timing signal in the AN/GPN–20 airport surveillance radar (ASR) video processor, establishes the basic radar-timing period (range cell) of

0.467 μsec

4.67 μsec

46.7 μsec

467 μsec

74. One of the functions of the AN/TPX–42A line-compensator assembly is to

Separate triggers from video signals

Separate beacon synchronous trigger (BST) from mode-sensitive triggers

Reestablish a 3:1 ratio between triggers and video

Reestablish a 5:1 ratio between triggers and video

75. On the OD–153 airport surveillance radar (ASR) indicator display, the identification position (I/P) or special position identifier (SPI) target symbol may be best described as a

P attached to the data block with a leader

X attached to the data block with a leader

Continually expanding and shrinking circle

Letter denoting the indicator in control of the target

76. The AN/GPN–20 airport surveillance radar (ASR) preamplifiers are designed for stability at the

Intermediate frequency (IF), with low noise figure

IF, with a high noise figure

Radio frequency (RF), with a low noise figure

RF, with a high noise figure

77. What circuit in the AN/GPN–20 airport surveillance radar (ASR) video processor converts bipolar analog video into a digital form?

Video conditioner

Video combiner

Signal processor

Quantizer

78. What function of the programmable indicator data processor (PIDP) II alerts the controller should the selected tracked targets deviate greater than ±300 feet from the controller assigned or current altitude?

Minimum low altitude monitoring

Conflict alert monitoring

Altitude monitoring

Sector monitoring

79. How many radar scans does double cancellation require?

Two

Three

Four

Five

80. Which multiplexing process is used when we combine five different channels into one common channel?

Frequency-division

Time-division

Amplitude

Phase

81. When the horizontal plane of the transmitted beam of an airport surveillance radar (ASR) is on a target for less time, the

Greater is the azimuth resolution

Greater is the range resolution

Less is the azimuth resolution

Less is the range resolution

82. In the AN/TPX–42A video signal processor, what is the name of the new azimuth computed between the on-target (OT) and end-of-target (EOT) azimuths?

Beamsplit azimuth

Targetsplit azimuth

Leading edge azimuth

Lagging edge azimuth

83. Which component consists of two radio frequency (RF) filters?

Coupler

Diplexer

Transmit-receive tube

Anti-transmit receive tube

84. The AN/GPN–20 airport surveillance radar's (ASR) log amplifier is a nonlinear device that

Amplifies very weak echo signals only

Reduces the amplitude of close-in targets

Provides maximum amplification to all echo signals

Amplifies all echo returns to near equal output levels

85. How does turning the AN/TPX–42A's gain time control (GTC) switch, on the front panel of the interrogator/receiver (I/R) unit, from OFF to ON affect the receiver's gain?

Amplifies the raw video

Reduces the gain of close-in replies

Increases the gain of close-in replies

Inhibits the receiver during all interrogation modes

86. The reply buffer used with the AN/TPX–42A video signal processor (VSP) memory unit can hold up to how many reply messages per pulse recurrence time (PRT)?

16

32

64

128

87. To maintain synchronization with air route traffic control center (ARTCC) equipment, an interfacility communications adapter (ICA) at idle

Continually retransmits previous data

Severs connection and redial as required

Transmits a pattern of ones and zeroes continually until the start of data

Transmits odd-parity search strings every 3.2 seconds to maintain the handshake

88. When the system computer is disengaged, the OD–153 airport surveillance radar (ASR) indicator operates as

A conventional plan-position indicator (PPI)

An A-scan indicator

A B-scan indicator

A J-scan indicator

89. The precision approach radar (PAR) indicator system displays the reference reflector

In azimuth only

In azimuth and elevation

Along the elevation glidepath

Only when selected

90. When using the AN/UPM–145 Radar Test Set, you must reduce the input with attenuators if input power exceeds

40 dBm

45 dBm

50 dBm

60 dBm

91. What device is used to specify a screen location to off center the sweep origin of an OD– 153 indicator?

Indicator control panel

Position entry module

Strobe lever

Keyboard

92. If the programmable indicator data processor (PIDP) II operation program detects a data transmission error from an air route traffic control center (ARTCC), the message is

Ignored

Displayed containing an longitudinal redundancy check (LRC) flag

Flagged and the target symbol flashes

Saved to memory and reverified during the next data burst

93. In the AN/GPN–22 precision approach radar (PAR) remoting system, what two types of modulation does the analog data undergo?

Amplitude modulation (AM) and phase

Pulse code modulation (PCM) and AM

AM and frequency key shifting (FSK)

PCM and FSK

94. What AN/GPN–22 precision approach radar (PAR) remoting channel is multiplexed but does not modulate a subcarrier, since the frequency range of the information makes it suitable for direct transmission?

Voice

Digital

Analog

Video/triggers/data

95. The AN/UPM–145 output frequency can be adjusted between

6.4 and 10.4 GHz

7.4 and 10 GHz

8.4 and 10 GHz

8.4 and 9.4 GHz

96. On the interrogator set control (B-box), if the TARGET LOAD indicator comes on, it's indicating that the programmable indicator data processor (PIDP) II is processing more than

128 targets

200 targets

300 targets

320 targets

97. In the AN/GPN–20 airport surveillance radar (ASR), at what limit from center frequency does the automatic frequency control (AFC) circuitry stop tuning and shut off the transmitter high voltage?

± 1 MHz

± 1.5 MHz

± 2 MHz

± 4 MHz

98. Which AN/GPN–22 precision approach radar (PAR) dual-redundant receiver module performs the filtering, limiting, phase detection, analog-to-digital (A/D) conversion, decommutation, and integration of the azimuth and elevation signals?

IF down converter

Error detector

Frequency converter

MTI detector

99. What type of multiplexing is used in the closure, analog, digital, and video/trigger/data channels of the AN/GPN–22 precision approach radar (PAR)?

Time division

Frequency

Amplitude

Phase

100. In the AN/TPX–42A's range azimuth beacon monitor (RABM), which device isolates the receiver input from the transmitter output?

Diplexer

Crystal detector

Preselector filter

Pulse-width discriminator

101. In a 2-line character block on the OD–153 airport surveillance radar (ASR) indicator, the second line consists of three decimal digits representing

Reported altitude in hundreds of feet

Assigned altitude in thousands of feet

Reported heading of the tracked aircraft

Predicted heading of the tracked aircraft

102. On the digital scan converter (DSC) control panel of the digital bright radar indicator tower equipment's (DBRITE), the off-line built-in test (BIT) is disabled by setting the

BIT TEST switch to BIT

Control switch to LOCAL

Control switch to TOWER

BIT TEST switch to ONLINE

103. In the AN/TPX–42A transfer switching drawer assembly (TSDA), the amplitude normalizer circuits limit inputs to how many volts before routing the signals to other circuits?

0.25

0.5

1.5

5

104. In the programmable indicator data processor (PIDP) II display interface, how often does a sector interrupt occur?

Every 11.25 from north (0)

Once per sweep at 22.5 from north

Once per sweep at 11.25 from north

Whenever there is a new data update

105. In the AN/GPN–22 precision approach radar (PAR), what is the output of the signal data converter (SDC) to the indicator group?

Bipolar video

Unipolar video

Enhanced digital video

Enhanced negative video

106. The point at which sensitivity time control (STC) wave shape ends is the

Start value

Initial value

Recovery baseline

Radio frequency (RF) or intermediate frequency (IF) baseline

107. What component in the AN/TPX–42A video signal processor monitors for the possible interference condition called garble?

Core memory

Signal processor

Reply detection unit

Target detection unit

108. In the AN/GPN–20 airport surveillance radar (ASR) transmitter, what causes the magnetron to oscillate?

Low-voltage positive pulse from the pulse transformer

Low-voltage pulse and radio frequency (RF) drive signal from the receiver

High-voltage negative pulse from the pulse transformer

High-voltage negative pulse and RF drive signal from the receiver

109. What is the total number of automatic alignment procedures to be performed by the timing generator during dead time in the AN/GPN–22 precision approach radar (PAR)?

Two

Four

Six

Eight

110. Antilog circuits may be used to reduce the gain of

Normal video

Moving target indicator (MTI) video

Log video

Noise

111. In the AN/TPX–42A, which trigger is used to develop the interrogator side lobe suppression (ISLS) switching trigger?

P1

P2

P3

Radar zero range

112. In the AN/GPN–22 precision approach radar's (PAR) signal data converter (SDC), what permits the comparison of echoes from three radar receive periods?

Phase comparison

Phase comparison and video shifting

Conversion of bipolar video to a digital form

Conversion of unipolar video to a digital form

113. What function of AN/GPN–20 airport surveillance radar (ASR) range azimuth gating (RAG) is used to indicate runway, air route, or approach pattern?

Test

Isolated gating

Azimuth strobe gating

Azimuth gating of sensitivity time control (STC)

114. What is the frequency of the transmitted output signal from the range azimuth beacon monitor (RABM)?

1030 kilohertz (kHz)

1090 kHz

1030 Megahertz (MHz)

1090 MHz

115. An interrogator side-lobe suppression (ISLS) diplexer is used in lieu of an ISLS switch when the radar system has

Only one AC-coupled rotary joint for identification friend or foe/selective identification feature(IFF/SIF)

Only one DC-coupled rotary joint for IFF/SIF

A capacitively coupled rotary joint for IFF/SIF

A inductively coupled rotary joint for IFF/SIF

116. In the AN/GPN–22 precision approach radar (PAR), how many scan periods are required to perform video integration in the signal data converter (SDC)?

Three

Four

Five

Six

117. Which boards are in digital bright radar indicator tower equipment's (DBRITE) digital scan converter (DSC)?

Plan position indicator (PPI), interface, logic

PPI, synthetic, logic

Interface, PPI, synthetic

Interface, logic, synthetic

118. The type of remote control unit (RCU) used with the digital bright radar indicator tower equipment's (DBRITE) is determined by the

Number of displays in use

Physical location of the system

Number of RCUs required for facility operation

Type of automation system connected to the digital scan converter (DSC) cabinet

119. Where are the modulated subcarriers that represent the various types of inputs to the AN/GPN–22 precision approach radar (PAR) remoting circuits summed?

Combiner circuits

Target data computer

Remoting common channel

Video/trigger channel separator

120. What is the maximum number of digital bright radar indicator tower equipment's (DBRITE) display units that can be driven by a digital scan converter (DSC)?

Two

Four

Six

Eight

121. In the digital bright radar indicator tower equipment's (DBRITE) system, when a built-in test (BIT) function detects a circuit failure, an error code that corresponds to the failure is shown on

All operational digital scan converters (DSC)

All operational displays

The BIT readout panel of the DSC containing the fault

The displays linked to the DSC that is serving the faulty unit

122. In the AN/GPN–20 airport surveillance radar (ASR), what two signals are mixed in the automatic frequency control (AFC) mixer to produce a signal representative of the difference between the magnetron and stable local oscillator (STALO) frequency?

STALO and coherent oscillator (COHO) signal

STALO and preamplifier output

Attenuated transmitter pulse and COHO signal

Attenuated transmitter pulse and STALO signal

123. In the programmable indicator data processor (PIDP) II display interface, what message causes the display to update the targets in its memory so that a wedge follows the sweep around the cathode ray tube (CRT)?

Target data message

Display status message

Sector number message

Sector interrupt message

124. The phase of the AN/GPN–20 airport surveillance radar's (ASR) locked coherent oscillator (COHO) signal is determined by the

Stable local oscillator (STALO) signal

Magnetron pulse

Return echo phase

Front panel phase adjustment

3d1x5 Volume 2 (Ure)

1. Siting a precision approach radar (PAR) for multiple runway approaches can cause you to locate the unit outside the optimum coverage areas. If this occurs what would be the best location for the radar system?

2.

What first name or nickname would you like us to use?

2. Radio frequency (RF) to the antenna makes the transition from fixed to rotating waveguide within the

3. What identifies and blanks returns from targets beyond the operating range of the radar?

4. Once a track is established in the AN/GPN–22 precision approach radar (PAR), what device uses error data obtained from the received signal to predict where the target will be during the next track interval?

5. What capability makes the traveling wave tube (TWT) much more versatile than the magnetron?

6. In the AN/GPN–22 precision approach radar (PAR), the non-coherent mode of operation is used to

7. The airport surveillance radar (ASR) is used in which air traffic control (ATC) radar mission?

8. On the AN/GPN–22 precision approach radar (PAR) radar set controls (RSC), an "OVER TEMP" fault lamp indicates

9. In the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR), which of the following best describes the fault hierarchy for the automatic fault testing?

10. What is used to regulate the output of the AN/GPN–20 airport surveillance radar (ASR) transmitter's high voltage power supply?

11. In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is accomplished by transmitting two 1 microsecond (μsec) pulses that are composed of two X-band frequencies separated by

12. At what interval does the AN/GPN–22 precision approach radar's (PAR) target data computer (TDC) perform system fault monitoring?

13. In the AN/GPN–22 precision approach radar (PAR), the data loop interface logic circuitry used in each of the subsystems is commonly called

14. All of the front panel switches in the special test section of the dual redundant receiver of the AN/GPN–22 precision approach radar (PAR) are disabled during normal operation except for the

15. The primary function of the refresh memory (RM) in the precision approach radar (PAR) indicator system is to

16. In the AN/GPN–22 precision approach radar (PAR), what are the three modes of operation with respect to data loop operation?

17. The AN/GPN–20 airport surveillance radar (ASR) provides emergency obstruction light operation for a minimum of

18. The time necessary to quickly disconnect the transmitter and connect the receiver to the antenna is called

19. How will the final optimum tilt angle for the AN/GPN–20 airport surveillance radar (ASR) antenna be determined?

20. The AN/GPN–22 precision approach radar (PAR) required input voltage is 3-phase,

21. What receiver parameter does minimum discernable signal (MDS) check?

22. What is the primary advantage of having two operator keyboards for each control indicator group?

23. The target data computer in the AN/GPN–22 precision approach radar (PAR) processes the site parameter panel data once

24. In the AN/GPN–22 precision approach radar (PAR), the stabilized master oscillator (STAMO) multiplies the continuous wave (CW) transmitter drive signal to the

25. In the scan mode, the AN/GPN–22 precision approach radar (PAR) can direct the radio frequency (RF) beam to how many separate beam positions?

26. What is a measure of the ability to detect a small moving target in ground clutter?

27. For how many minutes is the AN/GPN–20 airport surveillance radar (ASR) control memory energized by the temporary power supply when a power failure occurs?

28. Azimuth resolution is directly related to what radar set characteristic?

29. The point designated as touchdown for a precision approach radar (PAR) is normally how many feet from the end of the runway?

30. The AN/GPN–20 airport surveillance radar (ASR) primary power input is 3-phase,

31. The airport surveillance radar transmitter site should be located more than ½ mile from the primary instrument approach path and touch-down point so that these areas

32. Which converter is used in both the AN/GPN–22 precision approach radar (PAR) shelter and radar approach control (RAPCON) remoting equipment to convert the parallel 32-bit data words to serial data and back again?

33. After initial turn-on, what is the recommended warm-up period for the AN/UPM–145 Radar Test Set before performing any tests?

34. In dual frequency diversity mode, the overall AN/GPN–20 airport surveillance radar (ASR) system timing is derived from the

35. To change the AN/GPN–20 airport surveillance radar (ASR) receiver stable local oscillator (STALO) frequency you must

36. How many narrow band filters does the AN/GPN–22 precision approach radar (PAR) employ to convert a shift in intermediate frequency (IF) to a range error signal?

37. AN/GPN–22 precision approach radar (PAR) emergency power is supplied by a

38. What is the original source of the continuous wave (CW) radio frequency (RF) drive in the AN/GPN–22 precision approach radar (PAR)?

39. The purpose of the traveling wave tube (TWT) radar modulator A6 in the AN/GPN–22 precision approach radar (PAR) transmitter is to

40. In the AN/GPN–22 precision approach radar (PAR) remoting system, which channel is not remoted to the radar unit?

41. In remoting signals, line attenuation is greatest at the

42. What effectively eliminates moving target indicator (MTI) blind speeds at the speeds seen in air traffic control?

43. Blind speed is a target speed at which successive radar returns changes phase by

44. In the programmable indicator data processor (PIDP) II, what service does the low-altitude alerting system perform?

45. In the AN/GPN–22 precision approach radar (PAR) system, frequency diversity is used in the scan mode to eliminate

46. Which of the following is an off-line test performed on the antenna position control unit (APCU) in the AN/GPN–22 precision approach radar (PAR)?

47. The AN/GPN–22 precision approach radar's (PAR) transmit/receive (T/R) section

48. In single cancellation, what happens to the pulse train after it is time-aligned with the next range scan?

49. The output voltage adjustment for the AN/GPN–20 airport surveillance radar (ASR) high voltage power supply is located

50. A diplexer enables the use of two

51. A phase detector that produces a large change in output voltage for a small change in input signal phase will

52. In the AN/GPN–20 airport surveillance radar (ASR) video processor, either log or normal video is selected for input in to the moving target indicator (MTI)/normal enhancer circuit by the

53. When off-line is selected on the digital bright radar indicator tower equipment's (DBRITE) digital scan converter (DSC) control panel, what mode is available for presentation?

54. What type of information does selective identification feature (SIF) Mode C reply represent?

55. In the AN/GPN–22 precision approach radar (PAR), the coherent and non-coherent input to the moving target indictor (MTI) detector is outputted as

56. The most common method of modulation used in remoting is

57. In the remoting section of the AN/GPN–22 precision approach radar (PAR), what is the purpose of the line driver equalizer circuits?

58. The precision approach radar (PAR) indicator system indicates an aircraft's

59. In the precision approach radar (PAR) indicator the top presents elevation versus

60. What should be the basis for adjusting the intermediate frequency (IF) gain in the AN/GPN–20 airport surveillance radar (ASR)?

61. What AN/TPX–42A air traffic control identification friend or foe/selective identification feature (IFF/SIF) component generates mode interrogation triggers?

62. Which switch on the AN/TPX–42A interrogator set control (B-box) determines how long the video signal processor (VSP) is allowed to process video?

63. In the event of a power loss the uninterruptible power supply is capable of operating the entire programmable indicator data processor (PIDP) II OL–475 equipment rack for period of how many minutes?

64. The AN/GPN–20 airport surveillance radar's (ASR) normal intermediate frequency (IF) amplifier provides IF

65. The precision approach radar (PAR) indicator system displays the decision height cursor

66. What AN/GPN–20 airport surveillance radar (ASR) meter is a good indicator of the transmitter output power?

67. What is the ideal horizontal beam width for the AN/GPN–20 airport surveillance radar (ASR) antenna at the half power point?

68. A passive feedhorn is used to achieve greater control over

69. The maximum amount of landline allowed between the AN/GPN–20 airport surveillance radar (ASR) and operations sites is

70. In the AN/GPN–22 precision approach radar (PAR), the operational program is locked to the real-time radar operations by the interrupt command signal from the

71. As the range increases, the sensitivity time control (STC) attenuation in the AN/GPN–22 precision approach radar (PAR) is stepped down in what increments?

72. Most moving target indicator (MTI) phase detectors are designed to develop a

73. The master timing signal in the AN/GPN–20 airport surveillance radar (ASR) video processor, establishes the basic radar-timing period (range cell) of

74. One of the functions of the AN/TPX–42A line-compensator assembly is to

75. On the OD–153 airport surveillance radar (ASR) indicator display, the identification position (I/P) or special position identifier (SPI) target symbol may be best described as a

76. The AN/GPN–20 airport surveillance radar (ASR) preamplifiers are designed for stability at the

77. What circuit in the AN/GPN–20 airport surveillance radar (ASR) video processor converts bipolar analog video into a digital form?