# CDC 2a951n Vol 5

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Questions: 100 | Attempts: 143

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• 1.

### 1. (801) Which part of a radar set amplifies and converts a wave into a video signal?

• A.

Antenna.

• B.

• C.

Indicator.

• D.

Transmitter.

Explanation
The receiver is the part of a radar set that amplifies and converts a wave into a video signal. It receives the radar signal that is reflected back from the target and amplifies it to a level that can be processed. It then converts the signal into a video format that can be displayed on the radar screen or indicator. The receiver plays a crucial role in detecting and interpreting the radar signals, allowing the operator to identify and track targets.

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• 2.

### 2. (801) If a radar echo returns after 310 microseconds, how many miles away is the target?

• A.

10

• B.

25

• C.

50

• D.

75

B. 25
Explanation
The time it takes for a radar echo to return can be used to calculate the distance to the target. In this case, the echo returns after 310 microseconds. Since the speed of light is approximately 186,000 miles per second, we can calculate the distance by multiplying the speed of light by the time it takes for the echo to return. Therefore, the target is approximately 57.66 miles away. However, since the answer choices are in whole numbers, the closest option is 25 miles.

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• 3.

### 3. (801) In which type of 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.

D. Frequency-modulation.
Explanation
In a frequency-modulation radar system, the transmitter produces a signal that regularly changes over a known range of frequencies. This modulation allows for better detection and measurement of targets, as the changing frequency helps to differentiate between different objects and reduce interference. This type of radar system is commonly used in applications such as weather radar and navigation systems.

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• 4.

### 4. (801) In a pulse-modulation radar system, what causes the transmitter to not interfere with the receiver?

• A.

The transmitter is turned off after each pulse.

• B.

The transmitter shifts the frequency of the pulse.

• C.

The transmitter transmits on a different frequency.

• D.

The transmitter uses a different antenna than the receiver.

A. The transmitter is turned off after each pulse.
Explanation
In a pulse-modulation radar system, the transmitter is turned off after each pulse in order to prevent interference with the receiver. By turning off the transmitter, the receiver is able to detect the reflected signal without any interference from the transmitter's own signal. This allows for accurate detection and measurement of the target object.

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• 5.

### 5. (801) What do you need to know in order to accurately locate an object in space using radar pulses?

• A.

Altitude and speed.

• B.

Altitude and range.

• C.

Range and direction.

• D.

Speed and direction.

C. Range and direction.
Explanation
To accurately locate an object in space using radar pulses, you need to know the range and direction of the object. Range refers to the distance between the radar and the object, while direction indicates the angle at which the object is located relative to the radar. Altitude and speed are not sufficient for accurately locating an object in space using radar pulses.

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• 6.

### 6. (801) Which type of radar system can only detect objects that are approaching or moving away from the receiver?

• A.

Beacon.

• B.

Frequency-shift.

• C.

Pulse-modulation.

• D.

Frequency-modulation.

B. Frequency-shift.
Explanation
Frequency-shift radar systems can only detect objects that are approaching or moving away from the receiver. This is because frequency-shift radar relies on the Doppler effect, which measures the change in frequency of the radar signal as it reflects off a moving object. By analyzing the change in frequency, the radar system can determine the speed and direction of the object. Therefore, frequency-shift radar is not able to detect objects that are stationary or moving perpendicular to the radar beam.

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• 7.

### 7. (802) 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 the listening time.

• D.

Lengthening the listening time.

C. Shortening the listening time.
Explanation
In a pulse-modulation radar system, the range is limited by shortening the listening time. This means that the radar system reduces the time it spends listening for the return signal after transmitting a pulse. By shortening the listening time, the radar system can increase the pulse repetition frequency, allowing for more pulses to be transmitted within a given time period. This increases the system's ability to detect targets at shorter ranges. Using less power or more power would not directly impact the range limitation, and lengthening the listening time would actually decrease the pulse repetition frequency and therefore limit the range even further.

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• 8.

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

• A.

Antenna.

• B.

• C.

Indicator.

• D.

Power supply.

Explanation
In a pulse-modulation radar system, the 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 transmitted pulse to return after bouncing off a target. By using the energy sent by the transmitter as a time reference, the receiver can accurately calculate the distance to the target based on the time it takes for the pulse to return. Therefore, the correct answer is receiver.

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• 9.

### 9. (802) Which component in a pulse-modulation radar system shapes the radio frequency energy into a narrow beam?

• A.

Antenna.

• B.

Indicator.

• C.

Transmitter.

• D.

Synchronizer.

A. Antenna.
Explanation
In a pulse-modulation radar system, the component that shapes the radio frequency energy into a narrow beam is the antenna. The antenna is responsible for transmitting and receiving the radar signals. It is designed to focus the energy in a specific direction, allowing the radar system to accurately detect and locate targets. The other options, such as the indicator, transmitter, and synchronizer, are not directly involved in shaping the radio frequency energy into a narrow beam.

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• 10.

### 10. (802) In the radar receiver during the heterodyning process, what frequency does the difference of the echo frequency and the local oscillator beat frequency produce?

• A.

Sum.

• B.

Error.

• C.

Difference.

• D.

Intermediate.

D. Intermediate.
Explanation
During the heterodyning process in a radar receiver, the difference between the echo frequency and the local oscillator beat frequency produces an intermediate frequency. This intermediate frequency is used for further processing and analysis of the radar signal.

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• 11.

### 11. (802) In a pulse-modulation radar system, the shape of a radar pulse determines

• A.

Target resolution, pulse repetition frequency, and peak power.

• B.

Transmit frequency, receive frequency, and speed of the target.

• C.

Range accuracy, minimum range, maximum range, and target resolution.

• D.

Minimum range, maximum range, pulse repetition frequency, and average power.

C. Range accuracy, minimum range, maximum range, and target resolution.
Explanation
In a pulse-modulation radar system, the shape of a radar pulse determines range accuracy, which is the ability to accurately measure the distance to a target. It also determines the minimum range, which is the closest distance at which the radar can detect a target, and the maximum range, which is the farthest distance at which the radar can detect a target. Additionally, the shape of the radar pulse affects the target resolution, which is the ability to distinguish between multiple targets that are close together.

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• 12.

### 12. (802) The maximum range of a pulse-modulation radar system primarily depends on

• A.

Pulse shape.

• B.

Power in the pulse.

• C.

Pulse recurrence time.

• D.

Pulse repetition frequency.

B. Power in the pulse.
Explanation
The maximum range of a pulse-modulation radar system primarily depends on the power in the pulse. This is because the power in the pulse determines the strength of the radar signal that is transmitted and received by the system. A higher power in the pulse allows the radar signal to travel a greater distance before it becomes too weak to be detected. Therefore, increasing the power in the pulse increases the maximum range of the radar system.

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• 13.

### 13. (803) In a frequency-shift radar system, what is the relationship between a transmitter/receiver and an aircraft when the received frequency is lower than the transmitted frequency?

• A.

They are a constant distance away from each other.

• B.

The aircraft is not reflecting any of the radar pulse.

• C.

The aircraft is flying towards the transmitter/receiver.

• D.

The aircraft is flying away from the transmitter/receiver.

D. The aircraft is flying away from the transmitter/receiver.
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. This is because the frequency shift occurs due to the Doppler effect, where the frequency of the radar signal changes based on the relative motion between the radar system and the aircraft. A lower received frequency suggests that the aircraft is moving away from the radar system, causing the radar signal to be stretched and resulting in a lower frequency.

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• 14.

### 14. (804) Which of the following are types of power loss in radio frequency lines?

• A.

• B.

Current, dielectric, and emission.

• C.

• D.

Explanation
The types of power loss in radio frequency lines are copper loss, dielectric loss, and radiation loss. Copper loss refers to the power dissipated in the conductors due to their resistance. Dielectric loss occurs when the dielectric material between the conductors absorbs energy and converts it into heat. Radiation loss happens when energy is radiated away from the transmission line into free space.

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• 15.

### 15. (804) The dimensions of a waveguide will determine the waveguide's

• A.

• B.

Frequency pHase shift and power loss.

• C.

Frequency and power-handling capability.

• D.

Voltage standing wave ratio and power-handling ability.

C. Frequency and power-handling capability.
Explanation
The dimensions of a waveguide determine its frequency and power-handling capability. The size and shape of the waveguide affect the frequencies that can propagate through it, with larger dimensions allowing for lower frequencies and smaller dimensions allowing for higher frequencies. Additionally, the dimensions of the waveguide also determine its power-handling capability, as larger dimensions can handle higher power levels without significant loss or damage. Therefore, the dimensions of a waveguide play a crucial role in determining its frequency range and power-handling capability.

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• 16.

### 16. (804) If the operating frequency is 100 MHz with a wavelength of three 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.

C. 2.1 meters.
Explanation
The wavelength of a wave is inversely proportional to its frequency, so as the frequency increases, the wavelength decreases. In this question, the operating frequency is given as 100 MHz and the wavelength is given as three meters. Since the frequency determining wall of the waveguide is the distance between two points where the wave is in phase, it can be determined by dividing the wavelength by two. Therefore, the frequency determining wall would be 1.5 meters.

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• 17.

### 17. (804) If the spacing between the waveguide walls or size of the walls changes, then there will be a change in impedence causing decreased

• A.

Heat.

• B.

Power.

• C.

Reflection.

• D.

Standing waves.

B. Power.
Explanation
When the spacing between the waveguide walls or the size of the walls changes, it affects the impedance of the waveguide. Impedance is the opposition to the flow of power in a waveguide. A change in impedance leads to a mismatch between the waveguide and the source, causing some of the power to be reflected back. Therefore, a change in impedance results in a decrease in power transmitted through the waveguide.

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• 18.

### 18. (804) What is the most common device used to connect multiple sections of a waveguide system?

• A.

Choke-joint.

• B.

• C.

Universal-joint.

• D.

Master cylinder.

A. Choke-joint.
Explanation
A choke-joint is the most common device used to connect multiple sections of a waveguide system. A choke-joint is designed to provide a high impedance to the unwanted propagation of electromagnetic waves, while allowing the desired waves to pass through. This helps to minimize signal loss and maintain the integrity of the waveguide system. Adapter plates are used to connect waveguides of different sizes, while universal-joints and master cylinders are not typically used in waveguide systems.

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• 19.

### 19. (804) For energy to move smoothly in and out of a waveguide, the end is

• A.

Capped.

• B.

Flared like a funnel.

• C.

Tappered to a point.

• D.

Twisted like a vortex.

B. Flared like a funnel.
Explanation
In order for energy to move smoothly in and out of a waveguide, the end needs to be flared like a funnel. This shape helps to minimize reflections and impedance mismatches, allowing the energy to flow efficiently. A flared end acts as a transition between the waveguide and the surrounding medium, ensuring that the energy is properly coupled and transmitted.

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• 20.

### 20. (805) 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.

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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• 21.

### 21. (805) What is the maximum antenna radiation pattern coverage of the color weather radar system (WXR).

• A.

Â± 90 degrees azimuth and Â± 30 degrees elevation.

• B.

Â± 30 degrees azimuth and Â± 90 degrees elevation.

• C.

Â± 180 degrees azimuth and Â± 60 degrees elevation.

• D.

Â± 60 degrees azimuth and Â± 180 degrees elevation.

A. Â± 90 degrees azimuth and Â± 30 degrees elevation.
Explanation
The correct answer is Â± 90 degrees azimuth and Â± 30 degrees elevation. This means that the color weather radar system has a maximum antenna radiation pattern coverage of 90 degrees in the horizontal direction (azimuth) and 30 degrees in the vertical direction (elevation). This coverage allows the radar system to effectively detect and display weather conditions within this range, providing pilots with important information for navigation and avoiding hazardous weather.

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• 22.

### 22. (806) What is the maximum height that the combined altitude radar altimeter (CARA) subsystem displays aircraft altitude above ground level?

• A.

5,000 feet.

• B.

25,000 feet.

• C.

35,000 feet.

• D.

50,000 feet.

D. 50,000 feet.
Explanation
The combined altitude radar altimeter (CARA) subsystem displays the aircraft altitude above ground level. The maximum height that it can display is 50,000 feet.

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• 23.

### 23. (806) What adjustment on the combined altitude radar altimeter (CARA) receiver/transmitter (R/T) is used by maintenance to correct the display to zero feet while the aircraft is on the ground?

• A.

Aircraft Ground Set.

• B.

Aircraft Installation Delay.

• C.

Aircraft Altitude Potentiometer.

• D.

B. Aircraft Installation Delay.
Explanation
The correct answer is Aircraft Installation Delay. This adjustment is used by maintenance to correct the display to zero feet while the aircraft is on the ground. It allows for a delay in the altitude reading to account for the time it takes for the altimeter to stabilize after installation. This ensures that the altitude reading is accurate and calibrated properly.

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• 24.

### 24. (806) What is/are the function(s) of the SET knob located on the combined altitude radar altimeter (CARA) 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.

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 (CARA) indicator serves multiple functions. It is used as an on/off control, allowing the user to turn the system on or off. Additionally, it is used to set the VALI (Vertical Altitude Limit Indicator) indicator, which helps pilots maintain safe vertical separation from other aircraft. Lastly, the SET knob also functions as a test button, allowing the user to check the system for proper operation.

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• 25.

### 25. (806) During bright lighting conditions what purpose does the digital readout dimmer control of the combined altitude radar altimeter (CARA) serve?

• A.

Allows user to dim the dispaly.

• B.

The dimmer control is disabled.

• C.

Allows user to brighten the display.

• D.

Allows user to dim or brighten display.

B. The dimmer control is disabled.
Explanation
The correct answer is "The dimmer control is disabled." This means that during bright lighting conditions, the digital readout dimmer control of the combined altitude radar altimeter (CARA) does not serve any purpose. It cannot be used to dim or brighten the display.

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• 26.

### 26. (806) What is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter (CARA) can display?

• A.

5,000 feet.

• B.

10,000 feet.

• C.

25,000 feet.

• D.

50,000 feet.

A. 5,000 feet.
Explanation
The correct answer is 5,000 feet. This is the maximum altitude that the analog pointer and dial of the combined altitude radar altimeter (CARA) can display.

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• 27.

### 27. (806) If self-test is manually initiated on the combined altitude radar altimeter (CARA), then what indications will be present on the indicator for the 1.5 seconds?

• A.

The pointer moves to 500 feet, digital display reads TEST, and the R/T lamp is illuminated.

• B.

The pointer moves to 500 feet, digital display reads 88888, and the R/T lamp is illuminated.

• C.

The pointer moves to 700 feet, digital display reads TEST, and the R/T lamp is illuminated.

• D.

The pointer moves to 700 feet, digital display reads 88888, and the R/T lamp is illuminated.

B. The pointer moves to 500 feet, digital display reads 88888, and the R/T lamp is illuminated.
Explanation
When the self-test is manually initiated on the combined altitude radar altimeter (CARA), the correct indication on the indicator for 1.5 seconds is that the pointer moves to 500 feet, the digital display reads 88888, and the R/T lamp is illuminated.

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• 28.

### 28. (807) Which radar application is used to produce a pictorial map of the terrain?

• A.

Ground mapping.

• B.

Terrain following.

• C.

Terrain avoidance.

• D.

A. Ground mapping.
Explanation
Ground mapping is the radar application used to produce a pictorial map of the terrain. This technique involves using radar to collect data about the surface of the Earth and then creating a visual representation of the terrain. Ground mapping can be used for various purposes such as navigation, military operations, and geological surveys. It allows for the identification of features such as mountains, rivers, and forests, and helps in creating accurate maps for various applications.

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• 29.

### 29. (807) Which radar application is used to maintain a preselected altitude above the ground?

• A.

• B.

Ground mapping.

• C.

Terrain following.

• D.

Terrain avoidance.

C. Terrain following.
Explanation
Terrain following is the correct answer because this radar application is used to maintain a preselected altitude above the ground. It is specifically designed to track the terrain and adjust the altitude of the aircraft accordingly to avoid obstacles and maintain a safe flying altitude. This type of radar is commonly used in military aircraft to fly at low altitudes while navigating through complex terrains.

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• 30.

### 30. (807) Which radar application sends data to compute time-to-go parameters?

• A.

• B.

• C.

• D.

Explanation
Bombing radar is the correct answer because it is used to calculate the time-to-go parameters for bombing missions. This type of radar is specifically designed to track and target enemy aircraft or ground targets, and it provides the necessary data to determine the time it will take for a bomb or missile to reach its intended destination. By accurately calculating the time-to-go parameters, bombing radar enables precise targeting and increases the effectiveness of bombing missions.

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• 31.

### 31. (808) What establishes the network system time for a Link-16 system?

• A.

Global positioning system (GPS).

• B.

Time division multiple access (TDMA).

• C.

Net control station (NCS).

• D.

Network time reference (NTR).

D. Network time reference (NTR).
Explanation
The network time reference (NTR) establishes the network system time for a Link-16 system. This means that the NTR is responsible for synchronizing the time across all the devices in the network, ensuring that they are all operating on the same time reference. The NTR serves as a central time source for the network, allowing for accurate and coordinated communication between the different components of the system.

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• 32.

### 32. (808) What does using net number 127 when initiating a Link-16 system indicate?

• A.

The use of a sub-net.

• B.

The use of a stacked net.

• C.

The use of a primary net.

• D.

The use of an alternate net.

B. The use of a stacked net.
Explanation
Using net number 127 when initiating a Link-16 system indicates the use of a stacked net.

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• 33.

### 33. (809) What are the kilobit data rates used in a stacked net of a Tactical Digital Information Link (TADIL) J secure voice channels?

• A.

6 or 4.

• B.

1.2 or 8.

• C.

2.4 or 16.

• D.

4.8 or 32.

C. 2.4 or 16.
Explanation
The kilobit data rates used in a stacked net of a Tactical Digital Information Link (TADIL) J secure voice channels are 2.4 or 16.

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• 34.

### 34. (810) If a unit has the need and capability to participate in both Link-16 and older Link systems, then the unit would normally be assigned an address between

• A.

00001 to 00177.

• B.

00177 to 00277.

• C.

17700 to 17877.

• D.

17877 to 17977.

A. 00001 to 00177.
Explanation
A unit that has the need and capability to participate in both Link-16 and older Link systems would normally be assigned an address between 00001 to 00177. This range of addresses allows the unit to communicate and exchange data effectively with both systems. The other options (00177 to 00277, 17700 to 17877, and 17877 to 17977) do not provide the same level of compatibility and may result in communication issues or limitations for the unit.

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• 35.

### 35. (810) To receive the highest track quality, a value of 15, what is the maximum distance in feet that the track be to the reported position?

• A.

25.

• B.

50.

• C.

250.

• D.

500.

B. 50.
Explanation
To receive the highest track quality with a value of 15, the maximum distance in feet that the track can be to the reported position is 50.

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• 36.

### 36. (810) What does the RELNAV function of the Link-16 system determine?

• A.

Time.

• B.

Distance.

• C.

Synchronization.

• D.

Geodetic position.

B. Distance.
Explanation
The RELNAV function of the Link-16 system determines the distance between two entities. This function is used to calculate the range or distance between two Link-16 terminals or platforms. It provides important information for situational awareness and coordination between different units in a network. By accurately determining the distance, the system can facilitate effective communication, coordination, and targeting capabilities among different entities.

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• 37.

### 37. (811) The elapsed time indicator of the Joint Tactical Information Distribution System (JTIDS) receiver/transmitter (R/T) indicates that time power has been

• A.

Applied to the R/T.

• B.

Removed from the R/T.

• C.

Applied to the digital data processor (DDP).

• D.

Removed from the DDP.

A. Applied to the R/T.
Explanation
The correct answer is "applied to the R/T." This means that power has been supplied to the Joint Tactical Information Distribution System (JTIDS) receiver/transmitter (R/T).

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• 38.

### 38. (811) Besides the digital data processor (DDP), what other unit(s) make up the digital data group processor (DDGP) of the Joint Tactical Information Distribution System (JTIDS)?

• A.

Interface unit.

• B.

• C.

Keyboard and monitor.

• D.

A. Interface unit.
Explanation
The digital data group processor (DDGP) of the Joint Tactical Information Distribution System (JTIDS) consists of not only the digital data processor (DDP) but also the interface unit. The interface unit plays a crucial role in connecting and facilitating communication between different components of the system. It allows the DDP to interact with other units and devices, enabling the exchange of data and information. Therefore, the interface unit is an essential part of the DDGP.

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• 39.

### 39. (811) Which subassembly is a part of the Joint Tactical Information Distribution System (JTIDS) control monitor set (CMS)?

• A.

Interface unit (IU).

• B.

Secure data unit (SDU).

• C.

• D.

Multiplex interface unit.

Explanation
The correct answer is SDU load control unit. The Joint Tactical Information Distribution System (JTIDS) control monitor set (CMS) consists of various subassemblies that are used for controlling and monitoring the JTIDS system. The SDU load control unit is one of these subassemblies, which is responsible for controlling the loading of data onto the secure data units (SDUs) within the JTIDS system. It ensures that the correct data is loaded onto the SDUs and that they are functioning properly. The SDU load control unit plays a crucial role in the overall operation of the JTIDS system.

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• 40.

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

• A.

1050.

• B.

520.

• C.

260.

• D.

130.

A. 1050.
Explanation
The correct answer is 1050. The question is asking for the power output in watts of the high power amplifier of the Joint Tactical Information Distribution System (JTIDS) when transmitting in the high power mode. The answer of 1050 indicates that the high power amplifier has a power output of 1050 watts in this mode.

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• 41.

### 41. (812) Which battery power source provides emergency back-up power to the Joint Tactical Information Distribution System (JTIDS) terminal to maintain critical data?

• A.

Lithium.

• B.

SulpHur dioxide.

• C.

• D.

Nickel-metal hydride.

Explanation
The correct answer is Nickel-cadmium. Nickel-cadmium batteries are commonly used as emergency back-up power sources because they have a high energy density, long cycle life, and can provide a reliable power supply for critical systems like the Joint Tactical Information Distribution System (JTIDS) terminal. Lithium batteries are also commonly used for back-up power, but they are not listed as an option in this question. Sulphur dioxide and Nickel-metal hydride batteries are not typically used for emergency back-up power in this context.

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• 42.

### 42. (812) What is the range of signals that the Joint Tactical Information Distribution System (JTIDS) low pass filter allows to pass?

• A.

240 - 304 MHz.

• B.

480 - 608 MHz.

• C.

960 - 1215 MHz.

• D.

1920 - 2430 MHz.

C. 960 - 1215 MHz.
Explanation
The correct answer is 960 - 1215 MHz. The range of signals that the Joint Tactical Information Distribution System (JTIDS) low pass filter allows to pass is between 960 and 1215 MHz.

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• 43.

### 43. (813) What frequency operating band is used by Joint Tactical Information Distribution System (JTIDS)?

• A.

L.

• B.

S.

• C.

X.

• D.

Ku.

A. L.
Explanation
The Joint Tactical Information Distribution System (JTIDS) operates in the L-band frequency. The L-band is a portion of the electromagnetic spectrum that ranges from 1 to 2 GHz. It is commonly used for various communication systems, including military applications. JTIDS utilizes this frequency band for secure and reliable data transmission between military platforms, enabling effective tactical information sharing and coordination.

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• 44.

### 44. (813) What are the maximum number of bits of data that can be transmitted in a given time slot of a Joint Tactical Information Distribution System (JTIDS)?

• A.

258.

• B.

465.

• C.

516.

• D.

930.

D. 930.
Explanation
The maximum number of bits of data that can be transmitted in a given time slot of a Joint Tactical Information Distribution System (JTIDS) is 930.

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• 45.

### 45. (813) If the Joint Tactical Information Distribution System (JTIDS) receiver/transmitter (R/T) receives signals from both the forward and aft antenna, what determines which antenna is selected for the message?

• A.

The most favorable signal-to-noise ratio.

• B.

The least voltage standing wave ratio (VSWR).

• C.

The strongest signal.

• D.

The highest VSWR.

A. The most favorable signal-to-noise ratio.
Explanation
The JTIDS receiver/transmitter (R/T) selects the antenna with the most favorable signal-to-noise ratio to ensure the best quality of the received signals. This means that the antenna that provides the clearest and strongest signal, with the least amount of noise interference, will be chosen for the message transmission.

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• 46.

### 46. (814) To attain coarse synchronization, how many receivers are used by the Joint Tactical Information Distribution System (JTIDS) receiver/transmitter (R/T)?

• A.

Two.

• B.

Four.

• C.

Six.

• D.

Eight.

D. Eight.
Explanation
The correct answer is Eight. The Joint Tactical Information Distribution System (JTIDS) receiver/transmitter (R/T) uses eight receivers to attain coarse synchronization.

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• 47.

### 47. (814) What are the two processes in which Joint Tactical Information Distribution System (JTIDS) fine synchronization are accomplished?

• A.

Active and dynamic.

• B.

Passive and active.

• C.

• D.

B. Passive and active.
Explanation
The Joint Tactical Information Distribution System (JTIDS) achieves fine synchronization through two processes: passive and active. In the passive process, JTIDS receives timing information from external sources without actively transmitting any signals. In the active process, JTIDS actively transmits synchronization signals to establish and maintain synchronization with other systems. Therefore, both passive and active processes are involved in achieving fine synchronization in JTIDS.

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• 48.

### 48. (815) Which component of the tactical information gateway (TIG) system enables beyond line of sight (BLOS) coverage?

• A.

L-band antennas.

• B.

Multipurpose interface panel (MIP).

• C.

Low noise amplifier (LNA)/diplexer assembly.

• D.

Satellite communication/global positioning system (SATCOM/GPS) antenna.

D. Satellite communication/global positioning system (SATCOM/GPS) antenna.
Explanation
The satellite communication/global positioning system (SATCOM/GPS) antenna enables beyond line of sight (BLOS) coverage in the tactical information gateway (TIG) system. This antenna allows for communication and positioning information to be transmitted and received from satellites, which provides coverage even when direct line of sight is obstructed. The other options, such as L-band antennas, multipurpose interface panel (MIP), and low noise amplifier (LNA)/diplexer assembly, do not specifically enable BLOS coverage.

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• 49.

### 49. (816) What is the purpose of the Multifunctionl Information Distribution System (MIDS) data link terminal?

• A.

Extend networks beyond the local area.

• B.

Provide line of sight connectivity to a local area network.

• C.

Provide accurate positional data for the data link terminal.

• D.

Transmit secure data messages across the Demand Assigned Multiple Access (DAMA) satellite network.

B. Provide line of sight connectivity to a local area network.
Explanation
The purpose of the Multifunctional Information Distribution System (MIDS) data link terminal is to provide line of sight connectivity to a local area network. This means that the terminal allows for communication between devices within a specific geographic area, using a direct line of sight connection. This connectivity is important for efficient and reliable data transmission within a localized network.

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• 50.

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

• A.

Identification, Friend or Foe (IFF), Enhanced Traffic Alert and collision Avoidance System (ETCAS), and Tactical Air Navigation (TACAN).

• B.

• C.

IFF, color weather radar, and Microwave Landing Systems MLS.

• D.

TACAN, Very High Frequency-Omnirange/Instrument Landing System (VOR/ILS), and radar altimeter.

A. Identification, Friend or Foe (IFF), Enhanced Traffic Alert and collision Avoidance System (ETCAS), and Tactical Air Navigation (TACAN).
Explanation
The Tactical Information Gateway (TIG) system monitors the Identification, Friend or Foe (IFF), Enhanced Traffic Alert and collision Avoidance System (ETCAS), and Tactical Air Navigation (TACAN) systems to prevent interference and possible terminal shutdowns.

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• Current Version
• Aug 12, 2023
Quiz Edited by
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• Apr 10, 2017
Quiz Created by
Keven