# 2A251 Volume 5 UREs

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Questions and Answers
• 1.

### If a radar echo returnes after 310 microseconds, how far away is the target?

• A.

10 miles

• B.

25 miles

• C.

50 miles

• D.

75 miles

Correct Answer
B. 25 miles
Explanation
The time it takes for a radar echo to return is directly proportional to the distance of the target. In this case, if the radar echo returns after 310 microseconds, it means that the target is located at a distance of 25 miles.

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• 2.

### In which radar system does the transmitter produce a signal that regularly changes over a known range of frequencies?

• A.

Beacon

• B.

Frequency-shift

• C.

Pulse-modulation

• D.

Frequency-modulation

Correct Answer
D. Frequency-modulation
Explanation
Frequency-modulation radar systems use a transmitter that produces a signal that regularly changes over a known range of frequencies. This technique allows for better detection and measurement of targets, as the frequency shift can be used to determine the range and velocity of the object being tracked. By continuously changing the frequency of the transmitted signal, frequency-modulation radar systems can provide more accurate and detailed information about the target.

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• 3.

### In a pulse-modulation radar system, the transmitter does not interfere with the receiver. This is possible because the transmitter

• A.

Is turned off after each pulse.

• B.

Shifts the frequency of the pulse

• C.

Transmits on a different frequency

• D.

Uses a different antenna than the receiver

Correct Answer
A. Is turned off after each pulse.
Explanation
In a pulse-modulation radar system, the transmitter being turned off after each pulse ensures that it does not interfere with the receiver. By turning off the transmitter, it allows the receiver to detect the returning echoes without any interference from the transmitted signal. This ensures that the radar system can accurately measure the time delay between the transmitted pulse and the received echo, allowing for accurate distance calculations.

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• 4.

### Which radar system is based on the Doppler principle?

• A.

Beacon

• B.

Frequency-shift

• C.

Pulse-modulation

• D.

Frequency-modulation

Correct Answer
B. Frequency-shift
Explanation
The radar system based on the Doppler principle is the Frequency-shift radar. The Doppler principle states that there is a change in frequency when there is relative motion between the source of the wave and the observer. In the case of Frequency-shift radar, it measures the change in frequency of the transmitted signal that occurs when it reflects off a moving target. By analyzing this frequency shift, the radar system can determine the velocity of the target.

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• 5.

### In a pulse-modulation radar system, a high pulse repetition frequency radar limits range by

• A.

Using less power

• B.

Using more power

• C.

Shortening listening time

• D.

Lengthening listening time

Correct Answer
C. Shortening listening time
Explanation
In a pulse-modulation radar system, a high pulse repetition frequency (PRF) means that the radar is transmitting pulses at a faster rate. This results in shorter listening times between pulses. When the listening time is shortened, the radar has less time to receive and process the returning echoes from targets. As a result, the radar's range is limited because it is unable to detect targets that are located further away. Therefore, shortening the listening time is the correct answer for how a high PRF radar limits range.

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• 6.

### Which component in a pulse-modulation radar set supplies the voltages that operate the other radar components?

• A.

Antenna

• B.

Indicator

• C.

Transmitter

• D.

Power Supply

Correct Answer
D. Power Supply
Explanation
The power supply in a pulse-modulation radar set supplies the voltages that operate the other radar components. It provides the necessary electrical power to the antenna, indicator, and transmitter, allowing them to function properly. Without a power supply, the radar set would not be able to generate and transmit pulses, receive and process signals, or display the radar information. Therefore, the power supply plays a crucial role in supplying the required voltages for the operation of the other radar components.

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• 7.

### Which component in a pulse-modulation radar system controls the operation of the entire radar set?

• A.

Antenna

• B.

Indicator

• C.

Transmitter

• D.

Synchronizer

Correct Answer
D. Synchronizer
Explanation
The synchronizer is the component in a pulse-modulation radar system that controls the operation of the entire radar set. It ensures that the transmitter, antenna, and indicator are all synchronized and working together properly. Without the synchronizer, the radar system would not be able to accurately transmit and receive pulses, resulting in unreliable radar readings.

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• 8.

### Where does the radar transmitter in a pulse-modulation radar system send a small amount of energy for use as a time reference?

• A.

Antenna

• B.

Receiver

• C.

Indicator

• D.

Power Supply

Correct Answer
B. Receiver
Explanation
In a pulse-modulation radar system, the radar transmitter sends a small amount of energy to the receiver for use as a time reference. This is because the receiver needs to accurately measure the time it takes for the radar pulse to travel to the target and back. By using a small amount of energy from the transmitter as a time reference, the receiver can precisely calculate the distance to the target based on the time delay of the reflected pulse.

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• 9.

### The minimum range of a pulse-modulation radar system is determined by the pulse

• A.

Shape

• B.

Duration

• C.

Recurrence time

• D.

Repetition frequency

Correct Answer
B. Duration
Explanation
The minimum range of a pulse-modulation radar system is determined by the duration of the pulse. This is because the duration of the pulse directly affects the time it takes for the radar signal to travel to the target and back. The minimum range is the shortest distance at which the radar system can accurately detect an object. Therefore, a shorter pulse duration allows for a shorter minimum range, as it allows the radar system to detect objects that are closer in distance.

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• 10.

### As the pulse duration of a radar system increases, what will happen to the systems minimum and maximum range?

• A.

Minimum range will increase, maximum range will increase

• B.

Minimum range will increase, maximum range will decrease

• C.

Minimum range will decrease, maximum range will decrease

• D.

Minimum range will decrease, maximum range will increase

Correct Answer
A. Minimum range will increase, maximum range will increase
Explanation
As the pulse duration of a radar system increases, the minimum range will increase because a longer pulse duration allows the radar to detect objects that are closer to it. Similarly, the maximum range will also increase because a longer pulse duration allows the radar to detect objects that are farther away. Therefore, both the minimum and maximum range of the radar system will increase as the pulse duration increases.

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• 11.

### The maximum range of a pulse-modulation radar system primarily depends on

• A.

Pulse shape

• B.

Power output

• C.

Pulse recurrence time

• D.

Pulse repitition frequency

Correct Answer
B. Power output
Explanation
The maximum range of a pulse-modulation radar system primarily depends on the power output. A higher power output allows the radar system to generate stronger and more intense pulses, which can travel longer distances before they weaken and become indistinguishable from background noise. Therefore, a radar system with a higher power output will have a greater maximum range compared to a system with a lower power output.

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• 12.

### In a frequency-shift radar system, the Doppler principle makes it possible to instantaneously sense and measure

• A.

Altitude and ground track

• B.

Target elevation and speed

• C.

Groundspeed and drift angle

• D.

Magnetic heading and altitude

Correct Answer
C. Groundspeed and drift angle
Explanation
The Doppler principle in a frequency-shift radar system allows for the instantaneous sensing and measurement of groundspeed and drift angle. This means that the radar system can accurately determine the speed at which a target is moving relative to the ground, as well as the angle at which it is drifting. This information is crucial for various applications such as aviation, maritime navigation, and meteorology.

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• 13.

### In a frequency-shift radar system, what is the relationship between a transmitter/receiver(T/R) and an aircraft when the received frequency is lower that the transmitted frequency?

• A.

They are a constant distance away from each other

• B.

The aircraft is not reflecting any of the radar pulses

• C.

The aircraft is flying toward the T/R

• D.

The aircraft is flying away from the T/R

Correct Answer
D. The aircraft is flying away from the T/R
Explanation
When the received frequency is lower than the transmitted frequency in a frequency-shift radar system, it indicates that the aircraft is moving away from the transmitter/receiver (T/R). This is because the frequency shift is caused by the Doppler effect, which occurs when there is relative motion between the T/R and the aircraft. As the aircraft moves away, the frequency of the radar signals received by the T/R decreases, resulting in a lower received frequency compared to the transmitted frequency.

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• 14.

### If the operating frequency is 100m megahertz (MHZ) with a wavelength of 3 meters, then the frequency determining wall of the waveguide would be

• A.

.9 meters

• B.

1.5 meters

• C.

2.1 meters

• D.

2.7 meters

Correct Answer
C. 2.1 meters
Explanation
The wavelength of a wave is inversely proportional to its frequency. In this question, the operating frequency is given as 100 megahertz (MHz) and the wavelength is given as 3 meters. To find the frequency determining wall of the waveguide, we need to divide the wavelength by the frequency. Therefore, 3 meters divided by 100 MHz gives us 0.03 meters/MHz. Since the frequency determining wall is the reciprocal of this value, it would be 1/(0.03 meters/MHz), which equals 2.1 meters.

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• 15.

### The function of a dummy load in search and weather radar is to

• A.

Simulate a capacitive load

• B.

Simulate a resistive load

• C.

Prevent standing waves

• D.

Simulate targets

Correct Answer
B. Simulate a resistive load
Explanation
A dummy load in search and weather radar is used to simulate a resistive load. This means that it mimics the electrical characteristics of a resistive load, which is a purely resistive element with no reactive components. By simulating a resistive load, the dummy load helps in testing and calibrating the radar system to ensure accurate readings and performance. It allows the radar system to operate as if it is detecting a real resistive target, providing a reliable reference for measurement and troubleshooting purposes.

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• 16.

### What component is used to couple radio frequency energy between the waveguide and test equipment

• A.

Feedhorn

• B.

Duplexer

• C.

Dummy Load

• D.

Directional Coupler

Correct Answer
D. Directional Coupler
Explanation
A directional coupler is used to couple radio frequency energy between the waveguide and test equipment. It is a passive device that allows for the measurement and monitoring of power levels in a transmission line. It is designed to split the power in the transmission line and direct a portion of it to a secondary port, allowing for accurate power measurements without disrupting the main signal flow. This makes it an essential component in RF testing and measurement applications.

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• 17.

### What is triggered when the AS-653C Radar Antenna Reflector rotates through the aircraft lubber line?

• A.

Bearing Circuit

• B.

Tilt control circuit

• C.

Stabilization circuit

• D.

Heading marker circuit

Correct Answer
D. Heading marker circuit
Explanation
When the AS-653C Radar Antenna Reflector rotates through the aircraft lubber line, it triggers the Heading marker circuit. This circuit is responsible for indicating the aircraft's heading on the radar display. As the antenna reflector rotates, it sends signals to the heading marker circuit, which then processes the information and displays the aircraft's heading on the radar screen. This allows the pilot to accurately determine the direction in which the aircraft is heading.

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• 18.

### Which component in the AN/APN-59 Radar System furnishes both pitch and roll drive signals to the antenna stabilization motors?

• A.

AS-653C

• B.

RT-289G

• C.

AM-853B

• D.

CN-221A

Correct Answer
C. AM-853B
Explanation
The AM-853B component in the AN/APN-59 Radar System furnishes both pitch and roll drive signals to the antenna stabilization motors.

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• 19.

### What component in the AN/APN-59 Radar System provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft altitude?

• A.

CN-221A

• B.

RT-289G

• C.

AM-853B

• D.

C-1242A

Correct Answer
A. CN-221A
Explanation
The CN-221A component in the AN/APN-59 Radar System provides stabilized pitch and roll reference data for control of antenna orientation, despite changes in aircraft altitude.

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• 20.

### What is the maximum height that the combined altitude radar altimeter subsystem computes aircraft altitude above ground level?

• A.

5,000 feet

• B.

25,000 feet

• C.

35,000 feet

• D.

50,000 feet

Correct Answer
D. 50,000 feet
Explanation
The combined altitude radar altimeter subsystem is capable of computing aircraft altitude above ground level up to a maximum height of 50,000 feet.

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• 21.

### When power is applied to the combined altitude radar altimeter, what is shown on the digital display?

• A.

All eights

• B.

All dashes

• C.

The word INIT

• D.

The word TEST

Correct Answer
B. All dashes
Explanation
When power is applied to the combined altitude radar altimeter, all dashes are shown on the digital display. This indicates that the altimeter is initializing and has not yet received any altitude data. Once the altimeter receives altitude information, the dashes will be replaced with the actual altitude reading.

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• 22.

### What is/are the function(s) of the SET knob located on the combined altitude radar altimeter indicator?

• A.

Used as an on/off control

• B.

Used as an on/off control and to set the VALI indicator

• C.

Used as an on/off control and as a test button to check the system

• D.

Used as an on/off control, to set the VALI indicator, and as a test button to check the system

Correct Answer
D. Used as an on/off control, to set the VALI indicator, and as a test button to check the system
Explanation
The SET knob on the combined altitude radar altimeter indicator serves multiple functions. Firstly, it is used as an on/off control, allowing the user to turn the system on or off. Additionally, the SET knob is used to set the VALI (Vertical Altitude Line Indicator) indicator, which helps the pilot maintain a specific altitude. Lastly, the SET knob can also act as a test button, allowing the user to check the system's functionality.

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• 23.

### What is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display?

• A.

5,000 feet

• B.

10,000 feet

• C.

25,000 feet

• D.

50,000 feet

Correct Answer
A. 5,000 feet
Explanation
The maximum altitude that the analog pointer and dial of the combined altitude radar altimeter can display is 5,000 feet.

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• 24.

### Which radar application is used to produce a pictorial map of the terrain?

• A.

Ground mapping

• B.

Terrain following

• C.

Terrain avoidance

• D.

Synthetic aperture radar

Correct Answer
A. Ground mapping
Explanation
Ground mapping is the radar application used to produce a pictorial map of the terrain. This technique involves the use of radar signals to create a detailed image of the Earth's surface, including features such as mountains, valleys, and bodies of water. By transmitting radar pulses and measuring the time it takes for the signals to bounce back, ground mapping radar can accurately determine the topography of the terrain and generate a visual representation of it. This information is useful in various applications, such as cartography, navigation, and military operations.

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• 25.

### Which radar application is used primarily as an aid to navigation

• A.

Search radar

• B.

Ground mapping

• C.

Terrain following

• D.

Terrain avoidance

Correct Answer
A. Search radar
Explanation
Search radar is used primarily as an aid to navigation. It is designed to detect and track objects in the surrounding area, including ships, aircraft, and other navigational landmarks. By providing information about the location and movement of these objects, search radar helps navigators in determining their own position and avoiding potential collisions. It is commonly used in maritime and aviation industries for navigation purposes. Ground mapping, terrain following, and terrain avoidance radars serve different purposes such as mapping the terrain, maintaining a safe altitude above the ground, and avoiding obstacles respectively, but they are not primarily used for navigation.

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• 26.

### Which radar application is used to fly along a preselected altitude above the ground?

• A.

Search radar

• B.

Ground mapping

• C.

Terrain following

• D.

Terrain avoidance

Correct Answer
C. Terrain following
Explanation
Terrain following is the radar application used to fly along a preselected altitude above the ground. This application utilizes radar technology to detect and track the terrain below the aircraft, allowing it to maintain a consistent altitude above the ground even in varying terrain conditions. By continuously monitoring the ground below, terrain following radar helps the aircraft avoid obstacles and maintain a safe and controlled flight path.

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• 27.

### Which radar application sends data to compute time-to-go parameters?

• A.

Search radar

• B.

Weather radar

• C.

Bombing radar

• D.

Synthetic aperture radar

Correct Answer
C. Bombing radar
Explanation
Bombing radar is used in military aircraft to accurately determine the time-to-go parameters for releasing bombs. This radar system sends data to the aircraft's computer, which calculates the remaining time and distance required for the bomb to reach its target. This information is crucial for ensuring accurate targeting and successful bombing missions.

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• 28.

### What establishes the network system time for a Link-16 system?

• A.

GPS

• B.

UTC

• C.

Net control station

• D.

Network time reference

Correct Answer
D. Network time reference
Explanation
The network time reference establishes the network system time for a Link-16 system. This means that it serves as the standard time source for all devices within the network. It provides synchronization and ensures that all devices are operating on the same time basis. This allows for accurate and coordinated communication and data exchange between different units in the network.

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• 29.

### How many hops per second does a Tactical Digital Information Link (TADIL) J perform to preclude jamming by a narrow band jammer?

• A.

51,000 per second

• B.

77,000 per second

• C.

51,000 per minute

• D.

77,000 per minute

Correct Answer
B. 77,000 per second
Explanation
The correct answer is 77,000 per second. This high number of hops per second is necessary to prevent jamming by a narrow band jammer. By rapidly changing frequencies, the TADIL J system can avoid being targeted and disrupted by the jamming signals. This frequency hopping technique makes it difficult for the jammer to track and interfere with the communication link, ensuring the integrity and security of the information being transmitted.

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• 30.

### When a Link-16 operator initiates the system using net number 127, then it indicates the use of a

• A.

Subnet

• B.

Stacked net

• C.

Primary net

• D.

Alternate net

Correct Answer
B. Stacked net
Explanation
When a Link-16 operator initiates the system using net number 127, it indicates the use of a stacked net. A stacked net is a configuration in which multiple nets are combined or stacked together to increase the capacity and efficiency of the network. This allows for better communication and coordination among multiple participants in the Link-16 network. By using a stacked net, the operator can access a larger pool of resources and improve the overall performance of the system.

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• 31.

### To enhance voice clarity on Tactical Digital Information Link (TADIL) J secure digitized voice channels, the operator will select which data rate?

• A.

4 kilobits

• B.

8 kilobits

• C.

16 kilobits

• D.

32 kilobits

Correct Answer
C. 16 kilobits
Explanation
To enhance voice clarity on TADIL J secure digitized voice channels, the operator will select a data rate of 16 kilobits. This data rate is chosen because it provides a balance between voice quality and bandwidth usage. Higher data rates may offer better voice quality but require more bandwidth, while lower data rates may save bandwidth but result in lower voice quality. Therefore, 16 kilobits is the optimal choice to ensure clear and efficient voice communication on TADIL J secure digitized voice channels.

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• 32.

### What is the maximum number of Joint Tactical Distribution System (JTIDS) units (JU) that can participate in a Link-16 net?

• A.

7,777 JUs

• B.

4,092 JUs

• C.

32,766 JUs

• D.

524,284 JUs

Correct Answer
C. 32,766 JUs
Explanation
The maximum number of Joint Tactical Distribution System (JTIDS) units that can participate in a Link-16 net is 32,766 JUs.

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• 33.

### To receive a track quality value of 15, how close must the track be to the reported position?

• A.

25 feet

• B.

50 feet

• C.

250 feet

• D.

500 feet

Correct Answer
B. 50 feet
Explanation
To receive a track quality value of 15, the track must be within 50 feet of the reported position. This means that if the track is within a radius of 50 feet from the reported position, it will be considered close enough to receive a track quality value of 15.

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• 34.

### Which of the following fields does the Link-16 friendly status reports contain?

• A.

Activity

• B.

Nationality

• C.

Specific Type

• D.

Equipment status

Correct Answer
D. Equipment status
Explanation
Link-16 friendly status reports contain information about the equipment status. These reports provide updates on the operational status and condition of the equipment being used in the Link-16 network. This information is crucial for maintaining situational awareness and ensuring effective communication and coordination among the participating units. By including equipment status in the reports, the Link-16 network can quickly identify any potential issues or malfunctions that may affect the overall operational effectiveness.

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• 35.

### What does the relative navigation (RELNAV) function of the Link-16 system determine?

• A.

Time

• B.

Distance

• C.

Synchronization

• D.

Geodetic position

Correct Answer
B. Distance
Explanation
The relative navigation (RELNAV) function of the Link-16 system determines the distance between two entities. It provides information on the spatial separation between the participating units, allowing them to accurately assess the distance between each other. This is crucial for effective coordination and communication in military operations, as it enables units to maintain proper spacing and avoid collisions or other spatial conflicts.

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• 36.

### The elapsed time indicator of the receiver/transmitter (R/T) indicates time power has been

• A.

Applied to the R/T

• B.

Removed from the R/T

• C.

Applied to digital data processor

• D.

Removed from digital data processor

Correct Answer
A. Applied to the R/T
Explanation
The elapsed time indicator of the receiver/transmitter (R/T) indicates the amount of time that power has been applied to the R/T. This means that the indicator shows how long the R/T has been powered on and operating.

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• 37.

### Which subassembly is part of the control monitor set (CMS)?

• A.

Secure data unit (SDU)

• B.

Multiplex interface unit

• C.

SDU load control unit

• D.

Interface unit (IU)

Correct Answer
C. SDU load control unit
Explanation
The SDU load control unit is part of the control monitor set (CMS). The CMS is a system used to monitor and control various components in a larger system. The SDU load control unit is responsible for managing the load on the secure data unit (SDU), ensuring that it operates within its specified limits. Therefore, it is a subassembly that is included in the CMS.

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• 38.

### When transmitting in the high power mode, what is the power output of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS)

• A.

1050 watts

• B.

520 watts

• C.

260 watts

• D.

130 watts

Correct Answer
A. 1050 watts
Explanation
The power output of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS) when transmitting in the high power mode is 1050 watts.

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• 39.

### What power source is used to provide emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data?

• A.

Lithium batteries

• B.

Sulphur dioxide batteries

• C.

Nicked-cadmium batteries

• D.

Nickel-metal hydride batteries

Correct Answer
C. Nicked-cadmium batteries
Explanation
Nickel-cadmium batteries are used to provide emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data. These batteries are known for their high energy density and long life span, making them suitable for backup power applications. They have the ability to provide a stable power supply during emergencies, ensuring that the JTIDS terminal can continue to function and maintain critical data without interruption.

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• 40.

### What is the range of signals that the low pass filters pass?

• A.

240-304 megahertz (MHz)

• B.

480-608 MHz

• C.

960-1215 MHz

• D.

1920-2430 MHz

Correct Answer
C. 960-1215 MHz
Explanation
The range of signals that the low pass filters pass is 960-1215 MHz. This means that any signal with a frequency within this range will be allowed to pass through the low pass filters, while signals with frequencies outside of this range will be attenuated or blocked.

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• 41.

### What is the operating band used by Joint Tactical Information Distribution System (JTIDS)?

• A.

L-Band

• B.

S-Band

• C.

X-Band

• D.

Ku-Band

Correct Answer
A. L-Band
Explanation
The operating band used by Joint Tactical Information Distribution System (JTIDS) is L-Band.

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• 42.

### How many bits of data can be transmitted in a given time slot of a Joint Tactical Information Distribution System (JTIDS)?

• A.

258 bits

• B.

465 bits

• C.

516 bits

• D.

930 bits

Correct Answer
D. 930 bits
Explanation
The correct answer is 930 bits because the Joint Tactical Information Distribution System (JTIDS) is a military communication system that uses time division multiple access (TDMA) to transmit data. In this system, each time slot can transmit a certain amount of data. Out of the given options, 930 bits is the highest value, indicating that it can transmit the most amount of data in a given time slot.

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• 43.

### Which time slot structure would you utilize if you wanted to reduce the silent period and eliminate redundant information every two pulses in the Joint Tactical Information Distribution System (JTIDS)?

• A.

Packed-1 structure

• B.

Packed-2 structure

• C.

Packed-3 structure

• D.

Packed-4 structure

Correct Answer
D. Packed-4 structure
Explanation
The Packed-4 structure would be utilized in order to reduce the silent period and eliminate redundant information every two pulses in the JTIDS. This structure allows for more efficient use of time slots by packing four pulses into each slot, reducing the amount of time spent in silence between pulses. Additionally, by packing multiple pulses into each slot, redundant information can be eliminated, further optimizing the system's efficiency.

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• 44.

### When can the Joint Tactical Information Distribution System (JTIDS) synchronization process be initiated?

• A.

Once before a Net Entry message is transmitted

• B.

Every 12 seconds when a Net Entry message is transmitted

• C.

Every 12 seconds before a Net Entry message is transmitted

• D.

Once in the beginning after a Net Entry message is transmitted

Correct Answer
B. Every 12 seconds when a Net Entry message is transmitted
Explanation
The Joint Tactical Information Distribution System (JTIDS) synchronization process can be initiated every 12 seconds when a Net Entry message is transmitted. This means that the synchronization process occurs at regular intervals when the Net Entry message is sent. It is not a one-time occurrence, but rather a recurring process that ensures the system remains synchronized and up-to-date.

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• 45.

### In coarse synchronization, how man receivers are used by the Joint Tactical Information Distribution System (JTIDS) receiver/transmitter?

• A.

2

• B.

4

• C.

6

• D.

8

Correct Answer
D. 8
Explanation
The Joint Tactical Information Distribution System (JTIDS) receiver/transmitter uses 8 receivers in coarse synchronization. This means that the system is designed to receive and transmit information from and to multiple sources simultaneously, enhancing its effectiveness and efficiency in tactical operations.

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• 46.

### What are the two processes in which Joint Tactical Information Distribution System (JTIDS) fine sychronization are accomplished?

• A.

Passive and active

• B.

Active and dynamic

• C.

Passive and radio silent

• D.

Radio silent and reflexive

Correct Answer
A. Passive and active
Explanation
The Joint Tactical Information Distribution System (JTIDS) fine synchronization is accomplished through two processes: passive and active. The passive process involves receiving and analyzing signals from other systems to synchronize timing. The active process involves actively transmitting signals to other systems to synchronize timing.

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• 47.

### Which component of the Tactical Information Gateway (TIG) system enables beyond line-of-sight (BLOS) coverage

• A.

L-Band Antennas

• B.

Multipurpose interface panel

• C.

Low noise amplifier/diplexer assembly

• D.

Satellite communication/global positioning system antenna

Correct Answer
D. Satellite communication/global positioning system antenna
Explanation
The satellite communication/global positioning system antenna enables beyond line-of-sight (BLOS) coverage in the Tactical Information Gateway (TIG) system. This antenna is responsible for receiving and transmitting signals to and from satellites, allowing communication and positioning information to be transmitted over long distances, even when there are obstacles in the line of sight. By using satellite communication, the TIG system can achieve BLOS coverage, ensuring reliable and continuous communication capabilities in various operational scenarios.

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• 48.

### To prevent interference and possible terminal shutdowns, what systems does the Tactical Information Gateway (TIG) system monitor?

• A.

IFF, ETCAS, and TACAN

• B.

ETCAS and radar altimeter

• C.

IFF, color weather radar, and MLS

• D.

TACAN, VOR/ILS, and radar altimeter

Correct Answer
A. IFF, ETCAS, and TACAN
Explanation
The Tactical Information Gateway (TIG) system monitors the IFF (Identification Friend or Foe) system, ETCAS (Enhanced Traffic Collision Avoidance System), and TACAN (Tactical Air Navigation) system. These systems are monitored to prevent interference and possible shutdowns of the terminal.

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• 49.

### The serial transmission bit rate for the Military-Standard (MIL-STD) 1553 data bus is

• A.

1 megabit per second

• B.

8 megabits per second

• C.

16 megabits per second

• D.

32 megabits per second

Correct Answer
A. 1 megabit per second
Explanation
The correct answer is 1 megabit per second. The Military-Standard (MIL-STD) 1553 data bus has a serial transmission bit rate of 1 megabit per second. This means that it can transmit 1 million bits of data per second. This speed is sufficient for many military applications that require reliable and secure communication between different systems and devices.

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• 50.

### What is the structure of a Military-Standard (MIL-STD) 1553 data word?

• A.

20 bits long consisting of 1 sync bit, 16 data/command/status bits, and 3 parity bits

• B.

20 bits long consisting of 3 sync bit, 16 data/command/status bits, and 1 parity bits

• C.

32 bits long consisting of 1 sync bit, 28 data/command/status bits, and 3 parity bits

• D.

32 bits long consisting of 3 sync bit, 28 data/command/status bits, and 1 parity bits

Correct Answer
B. 20 bits long consisting of 3 sync bit, 16 data/command/status bits, and 1 parity bits
Explanation
The structure of a Military-Standard (MIL-STD) 1553 data word is 20 bits long and consists of 3 sync bits, 16 data/command/status bits, and 1 parity bit.

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