3D1X3 CDC Volume 3 URE

1. (408) On what kind of clock system is coordinated universal time based?

Amplitude modulation and pulse modulation.

Daylight saving.

24-hour.

12-hour.

Coordinated Universal Time (UTC) is based on a 24-hour clock system. This means that the day is divided into 24 equal parts, with each part representing one hour. This system is used worldwide to standardize timekeeping and ensure that everyone is on the same page when it comes to scheduling and coordinating events across different time zones. Unlike a 12-hour clock system, which repeats the numbers from 1 to 12 twice in a day, a 24-hour clock system uses numbers from 0 to 23 to represent the hours of the day.

Explanation

Coordinated Universal Time (UTC) is based on a 24-hour clock system. This means that the day is divided into 24 equal parts, with each part representing one hour. This system is used worldwide to standardize timekeeping and ensure that everyone is on the same page when it comes to scheduling and coordinating events across different time zones. Unlike a 12-hour clock system, which repeats the numbers from 1 to 12 twice in a day, a 24-hour clock system uses numbers from 0 to 23 to represent the hours of the day.

2. (409) Uploading satellite control data, tracking ballistic missiles, and predicting satellites tracking coordinates are examples of missions where all parties involved must have

Identical time code formats.

Different time code formats.

Synchronized timing.

Offset timing.

In missions such as uploading satellite control data, tracking ballistic missiles, and predicting satellites tracking coordinates, it is crucial for all parties involved to have synchronized timing. This means that they all need to have their clocks set to the same time and be able to coordinate their actions based on this shared time reference. Having synchronized timing ensures that all parties are working with the same time code formats, allowing for accurate and coordinated operations.

Explanation

In missions such as uploading satellite control data, tracking ballistic missiles, and predicting satellites tracking coordinates, it is crucial for all parties involved to have synchronized timing. This means that they all need to have their clocks set to the same time and be able to coordinate their actions based on this shared time reference. Having synchronized timing ensures that all parties are working with the same time code formats, allowing for accurate and coordinated operations.

3. (417) How are the high power amplifiers (HPA) cooled in an AN/GSC-52 earth terminal?

Air.

Cryogenic.

Liquid nitrogen.

Ethanol/glycol solution.

The high power amplifiers (HPA) in an AN/GSC-52 earth terminal are cooled using air. This means that air is used to dissipate the heat generated by the amplifiers, keeping them at a safe operating temperature. Air cooling is a common method used in electronic equipment to prevent overheating and ensure optimal performance.

Explanation

The high power amplifiers (HPA) in an AN/GSC-52 earth terminal are cooled using air. This means that air is used to dissipate the heat generated by the amplifiers, keeping them at a safe operating temperature. Air cooling is a common method used in electronic equipment to prevent overheating and ensure optimal performance.

4. (407) Solar time is based on

Atomic clock oscillations.

Apparent constellation movement.

The moon's rotation about the sun.

The apparent motion of the sun in the sky.

Solar time is based on the apparent motion of the sun in the sky. Solar time is determined by the position of the sun relative to a specific location on Earth. As the Earth rotates on its axis, the sun appears to move across the sky, causing shadows to change direction. This motion of the sun is used to measure time, with each day divided into 24 hours based on the sun's apparent movement. This is different from atomic clock oscillations, which are used for precise timekeeping but do not directly relate to the sun's motion. The moon's rotation about the sun and apparent constellation movement are also not directly related to solar time.

Explanation

Solar time is based on the apparent motion of the sun in the sky. Solar time is determined by the position of the sun relative to a specific location on Earth. As the Earth rotates on its axis, the sun appears to move across the sky, causing shadows to change direction. This motion of the sun is used to measure time, with each day divided into 24 hours based on the sun's apparent movement. This is different from atomic clock oscillations, which are used for precise timekeeping but do not directly relate to the sun's motion. The moon's rotation about the sun and apparent constellation movement are also not directly related to solar time.

5. (413) On a satellite, position and orientation control is especially critical for what type of antenna?

Broadband.

Wide angle.

High frequency.

Highly directional.

On a satellite, position and orientation control is especially critical for highly directional antennas. This is because highly directional antennas require precise pointing towards the desired target in order to achieve optimal signal strength and quality. Any deviation in position or orientation can result in a loss of signal or interference, making position and orientation control crucial for highly directional antennas on satellites.

Explanation

On a satellite, position and orientation control is especially critical for highly directional antennas. This is because highly directional antennas require precise pointing towards the desired target in order to achieve optimal signal strength and quality. Any deviation in position or orientation can result in a loss of signal or interference, making position and orientation control crucial for highly directional antennas on satellites.

6. (404) What are the two types of communications satellites?

Active and passive.

Active and real-time.

Delay and passive.

Delay and real-time.

Communications satellites can be categorized into two types: active and passive. Active satellites are equipped with onboard electronics and systems that actively amplify and transmit signals. They have the ability to receive, process, and retransmit signals to different locations on Earth. On the other hand, passive satellites do not have any active components and rely on reflecting or redirecting signals. They simply bounce the received signals back to Earth without any amplification or processing. Therefore, the correct answer is active and passive.

Explanation

Communications satellites can be categorized into two types: active and passive. Active satellites are equipped with onboard electronics and systems that actively amplify and transmit signals. They have the ability to receive, process, and retransmit signals to different locations on Earth. On the other hand, passive satellites do not have any active components and rely on reflecting or redirecting signals. They simply bounce the received signals back to Earth without any amplification or processing. Therefore, the correct answer is active and passive.

7. (410) What two factors cause a quartz oscillator's resonant frequency to drift?

Humidity and aging.

Temperature and aging.

Humidity and operating frequency.

Temperature and operating frequency.

The resonant frequency of a quartz oscillator can drift due to temperature changes and aging. Temperature affects the physical properties of the quartz crystal, causing its resonant frequency to change. Aging refers to the gradual degradation of the crystal over time, which can also cause a drift in the resonant frequency. Humidity and operating frequency are not mentioned as factors that directly cause the drift in the resonant frequency of a quartz oscillator.

Explanation

The resonant frequency of a quartz oscillator can drift due to temperature changes and aging. Temperature affects the physical properties of the quartz crystal, causing its resonant frequency to change. Aging refers to the gradual degradation of the crystal over time, which can also cause a drift in the resonant frequency. Humidity and operating frequency are not mentioned as factors that directly cause the drift in the resonant frequency of a quartz oscillator.

8. (412) What is multiplexing?

Transmitting one signal over multiple transmission paths.

Transmitting one signal multiple times over a single transmission path.

Combining multiple signals for transmission over a single transmission path.

Combining multiple signals for transmission over separate, individial transmission paths.

Multiplexing refers to the process of combining multiple signals into a single transmission path. This allows for efficient use of the available bandwidth and maximizes the utilization of the transmission medium. By multiplexing, multiple signals can be transmitted simultaneously over a single transmission path, which reduces the cost and complexity of the communication system.

Explanation

Multiplexing refers to the process of combining multiple signals into a single transmission path. This allows for efficient use of the available bandwidth and maximizes the utilization of the transmission medium. By multiplexing, multiple signals can be transmitted simultaneously over a single transmission path, which reduces the cost and complexity of the communication system.

9. (422) The secure mobile anti-jam tactical terminal (SMART-T) provides user data rates through

T-1 (128 Kbps).

T-1 (256 Kbps).

T-1 (1.544 Mbps).

T-1 (2.048 Mbps).

The correct answer is T-1 (1.544 Mbps). This is because T-1 is a digital transmission line that can carry data at a rate of 1.544 Mbps. The SMART-T terminal uses T-1 to provide user data rates, which means it can transmit data at this speed.

Explanation

The correct answer is T-1 (1.544 Mbps). This is because T-1 is a digital transmission line that can carry data at a rate of 1.544 Mbps. The SMART-T terminal uses T-1 to provide user data rates, which means it can transmit data at this speed.

10. (432) What is the name of the companding scale used in US telephone networks and standarizard for analog-to-digital conversion?

Metric.

A-Law.

Mu-Law.

Old English.

Mu-Law is the name of the companding scale used in US telephone networks and standardized for analog-to-digital conversion. This companding technique is based on logarithmic compression and expansion of the audio signal to improve the signal-to-noise ratio during transmission. Mu-Law is widely used in North America and Japan, while A-Law is used in Europe and other parts of the world. Old English is not related to companding or analog-to-digital conversion, and Metric is not the correct answer for this question.

Explanation

Mu-Law is the name of the companding scale used in US telephone networks and standardized for analog-to-digital conversion. This companding technique is based on logarithmic compression and expansion of the audio signal to improve the signal-to-noise ratio during transmission. Mu-Law is widely used in North America and Japan, while A-Law is used in Europe and other parts of the world. Old English is not related to companding or analog-to-digital conversion, and Metric is not the correct answer for this question.

11. (404) Which satellite reflects signals transmitted toward it?

Active.

Delay.

Passive.

Real-time.

Passive satellites reflect signals transmitted toward them. Unlike active satellites that generate and transmit their own signals, passive satellites simply reflect or bounce back signals that are transmitted from the ground. These satellites do not have their own transmitters and rely on the signals they receive to be reflected back to the ground.

Explanation

Passive satellites reflect signals transmitted toward them. Unlike active satellites that generate and transmit their own signals, passive satellites simply reflect or bounce back signals that are transmitted from the ground. These satellites do not have their own transmitters and rely on the signals they receive to be reflected back to the ground.

12. (407) An atomic time scale is based on the frequency of which type of oscillator?

Pendulum.

Crystal.

Quartz.

Cesium.

An atomic time scale is based on the frequency of a cesium oscillator. Cesium atomic clocks are the most accurate and reliable timekeeping devices available. They work by measuring the vibrations of cesium atoms, which have a specific and constant frequency. This frequency is used as the basis for defining the unit of time, the second, and is used in various applications such as GPS navigation, telecommunications, and scientific research. Pendulum, crystal, and quartz oscillators are not used in atomic time scales as they are not as precise and stable as cesium oscillators.

Explanation

An atomic time scale is based on the frequency of a cesium oscillator. Cesium atomic clocks are the most accurate and reliable timekeeping devices available. They work by measuring the vibrations of cesium atoms, which have a specific and constant frequency. This frequency is used as the basis for defining the unit of time, the second, and is used in various applications such as GPS navigation, telecommunications, and scientific research. Pendulum, crystal, and quartz oscillators are not used in atomic time scales as they are not as precise and stable as cesium oscillators.

13. (410) The operation of the atomic clock is based on the phenomenon that

Crystals resonate when an electric charge is applied.

Atoms release energy at a particular resonant frequency.

Atoms are sensitive to temperature and directional effects.

When atoms are split they produce predictable nuclear reactions.

The correct answer is "atoms release energy at a particular resonant frequency." Atomic clocks work by measuring the vibrations or oscillations of atoms, which occur at a specific frequency. These vibrations are very stable and consistent, allowing atomic clocks to accurately measure time. By counting the number of vibrations that occur within a given period, the atomic clock can determine the precise passage of time. This is why atomic clocks are considered one of the most accurate timekeeping devices available.

Explanation

The correct answer is "atoms release energy at a particular resonant frequency." Atomic clocks work by measuring the vibrations or oscillations of atoms, which occur at a specific frequency. These vibrations are very stable and consistent, allowing atomic clocks to accurately measure time. By counting the number of vibrations that occur within a given period, the atomic clock can determine the precise passage of time. This is why atomic clocks are considered one of the most accurate timekeeping devices available.

14. (411) Which type of modem transmits RF signals over coaxial cable?

Voice.

Cable.

Radio.

Wireless.

The correct answer is "Cable" because a cable modem is specifically designed to transmit RF signals over coaxial cable. This type of modem is commonly used for internet connectivity, allowing users to access the internet through their cable television lines. Unlike other modems, a cable modem utilizes the existing cable infrastructure to transmit and receive data, providing a high-speed internet connection.

Explanation

The correct answer is "Cable" because a cable modem is specifically designed to transmit RF signals over coaxial cable. This type of modem is commonly used for internet connectivity, allowing users to access the internet through their cable television lines. Unlike other modems, a cable modem utilizes the existing cable infrastructure to transmit and receive data, providing a high-speed internet connection.

15. (416) What signals originating from the satellite do we use to acquire and track the satellite?

Beacon.

Ephemeris.

Telemetry.

Communication.

We use beacon signals originating from the satellite to acquire and track the satellite. Beacon signals are continuous radio signals transmitted by the satellite, which can be detected and used to determine the satellite's position and track its movement. This allows us to establish and maintain communication with the satellite, as well as accurately determine its location in space. Ephemeris refers to the information about the satellite's orbit, telemetry refers to the data transmitted by the satellite, and communication refers to the overall process of exchanging information with the satellite.

Explanation

We use beacon signals originating from the satellite to acquire and track the satellite. Beacon signals are continuous radio signals transmitted by the satellite, which can be detected and used to determine the satellite's position and track its movement. This allows us to establish and maintain communication with the satellite, as well as accurately determine its location in space. Ephemeris refers to the information about the satellite's orbit, telemetry refers to the data transmitted by the satellite, and communication refers to the overall process of exchanging information with the satellite.

16. (432) Because they use differing conversion scales, what process must take place in order to transmit voice/data between telephone networks in the US and European countries?

Encoding.

Decoding.

Quantizing.

Transcoding.

Transcoding is the correct answer because telephone networks in the US and European countries use different conversion scales. Transcoding refers to the process of converting data from one format to another, and in this case, it would involve converting voice/data signals between the US and European networks to ensure compatibility. This process allows for seamless transmission of voice and data between the two networks despite their differing conversion scales.

Explanation

Transcoding is the correct answer because telephone networks in the US and European countries use different conversion scales. Transcoding refers to the process of converting data from one format to another, and in this case, it would involve converting voice/data signals between the US and European networks to ensure compatibility. This process allows for seamless transmission of voice and data between the two networks despite their differing conversion scales.

17. (403) The closest point of orbit that a satellite comes to the Earth is called the

Apogee.

Perigee.

Major axis.

Minor axis.

The correct answer is perigee. The question is asking for the term that refers to the closest point of orbit that a satellite comes to the Earth. The term perigee specifically refers to this point, while apogee refers to the farthest point of orbit. Major axis and minor axis are terms used in reference to the shape of an elliptical orbit and do not specifically describe the closest point of orbit. Therefore, the correct answer is perigee.

Explanation

The correct answer is perigee. The question is asking for the term that refers to the closest point of orbit that a satellite comes to the Earth. The term perigee specifically refers to this point, while apogee refers to the farthest point of orbit. Major axis and minor axis are terms used in reference to the shape of an elliptical orbit and do not specifically describe the closest point of orbit. Therefore, the correct answer is perigee.

18. (403) What is the inclination angle of a polar orbit?

0 degrees.

45 degrees.

90 degrees.

180 degrees

A polar orbit is a type of orbit that goes over the Earth's poles, passing over both the North and South poles. In this type of orbit, the inclination angle is 90 degrees because the orbital plane is perpendicular to the equator. This means that the satellite or spacecraft will pass over the poles at each orbit. Therefore, the correct answer is 90 degrees.

Explanation

A polar orbit is a type of orbit that goes over the Earth's poles, passing over both the North and South poles. In this type of orbit, the inclination angle is 90 degrees because the orbital plane is perpendicular to the equator. This means that the satellite or spacecraft will pass over the poles at each orbit. Therefore, the correct answer is 90 degrees.

19. (406) When computing satellite look angles, ground distance on the earth's surface is expressed in

Degrees.

Seconds.

Minutes.

Nautical miles.

When computing satellite look angles, ground distance on the earth's surface is expressed in degrees. This is because look angles are used to determine the direction in which a satellite is viewed from a specific location on Earth's surface. The ground distance is measured in degrees of latitude and longitude, which are used to pinpoint a specific location on the Earth's surface. Therefore, expressing ground distance in degrees is the most appropriate unit of measurement for computing satellite look angles.

Explanation

When computing satellite look angles, ground distance on the earth's surface is expressed in degrees. This is because look angles are used to determine the direction in which a satellite is viewed from a specific location on Earth's surface. The ground distance is measured in degrees of latitude and longitude, which are used to pinpoint a specific location on the Earth's surface. Therefore, expressing ground distance in degrees is the most appropriate unit of measurement for computing satellite look angles.

20. (426) The Iridium secure module provides secure voice communications up to and including what level of classification?

Top Secret.

Secret.

Confidential.

For Official Use Only.

The Iridium secure module is capable of providing secure voice communications up to and including the highest level of classification, which is Top Secret. This means that the module ensures the confidentiality and integrity of voice communications at the highest level of secrecy.

Explanation

The Iridium secure module is capable of providing secure voice communications up to and including the highest level of classification, which is Top Secret. This means that the module ensures the confidentiality and integrity of voice communications at the highest level of secrecy.

21. (427) Which service provider is a new satellite communications company specifically dedicated to provide commercial X-band services exclusively to US and Allied governments?

International Telecommunications Satellite Organization.

European Telecommunications Satellite Organization.

Pan-American Satellite Corporation.

XTAR, LLC.

XTAR, LLC. is the correct answer because it is stated in the question that the service provider is a new satellite communications company dedicated to providing commercial X-band services exclusively to US and Allied governments. The other options, International Telecommunications Satellite Organization, European Telecommunications Satellite Organization, and Pan-American Satellite Corporation, do not fit this description.

Explanation

XTAR, LLC. is the correct answer because it is stated in the question that the service provider is a new satellite communications company dedicated to providing commercial X-band services exclusively to US and Allied governments. The other options, International Telecommunications Satellite Organization, European Telecommunications Satellite Organization, and Pan-American Satellite Corporation, do not fit this description.

22. (402) The maximum distance a Tropo/Satellite Support Radio can operate with the 2-foot antenna is

10 miles.

25 miles.

100 miles.

250 miles.

The correct answer is 25 miles. The maximum distance a Tropo/Satellite Support Radio can operate with a 2-foot antenna is 25 miles. This means that the radio can transmit and receive signals effectively within a radius of 25 miles using the given antenna.

Explanation

The correct answer is 25 miles. The maximum distance a Tropo/Satellite Support Radio can operate with a 2-foot antenna is 25 miles. This means that the radio can transmit and receive signals effectively within a radius of 25 miles using the given antenna.

23. (402) In the Tropo/Satellite Support Radio's baseband assembly, a 1-volt peak-to-peak input signal results in how much frequency deviation in the transmitter?

+/- 4 MHz.

Less than +/- 4 MHz.

More than +/- 4 MHz.

No signal deviation.

A 1-volt peak-to-peak input signal in the Tropo/Satellite Support Radio's baseband assembly results in a frequency deviation of +/- 4 MHz in the transmitter.

Explanation

A 1-volt peak-to-peak input signal in the Tropo/Satellite Support Radio's baseband assembly results in a frequency deviation of +/- 4 MHz in the transmitter.

24. (405) What satellite access technique is being used when all channels are pooled and used by any station, according to its instantaneous traffic load?

Code division multiple access (CDMA).

Time division multiple access (TDMA).

Demand assigned multiple access (DAMA).

Frequency division multiple access (FDMA).

Demand Assigned Multiple Access (DAMA) is a satellite access technique where all channels are pooled and used by any station based on its instantaneous traffic load. This means that the channels are dynamically assigned to different stations based on their demand, allowing for efficient utilization of the available resources. CDMA, TDMA, and FDMA are not applicable in this scenario as they do not involve pooling and dynamic assignment of channels based on traffic load.

Explanation

Demand Assigned Multiple Access (DAMA) is a satellite access technique where all channels are pooled and used by any station based on its instantaneous traffic load. This means that the channels are dynamically assigned to different stations based on their demand, allowing for efficient utilization of the available resources. CDMA, TDMA, and FDMA are not applicable in this scenario as they do not involve pooling and dynamic assignment of channels based on traffic load.

25. (409) The international agency responsible for coordinated universal time (UTC) is the

United States Naval Observatory.

International Bureau of Weights and Measures.

Precision Measurement Equipment Laboratory.

National Institute of Standards and Technology.

The International Bureau of Weights and Measures is responsible for coordinating universal time (UTC). This agency ensures that time is standardized and accurate across the globe. They work to maintain and improve the international time scale, which is essential for various scientific, technological, and practical applications. The United States Naval Observatory, Precision Measurement Equipment Laboratory, and National Institute of Standards and Technology may be involved in timekeeping and measurement, but they are not specifically responsible for coordinating universal time.

Explanation

The International Bureau of Weights and Measures is responsible for coordinating universal time (UTC). This agency ensures that time is standardized and accurate across the globe. They work to maintain and improve the international time scale, which is essential for various scientific, technological, and practical applications. The United States Naval Observatory, Precision Measurement Equipment Laboratory, and National Institute of Standards and Technology may be involved in timekeeping and measurement, but they are not specifically responsible for coordinating universal time.

26. (421) What is the minimum number of global positioning system satellites that must be tracked for accurate three-dimentional navigation?

Two.

Three.

Four.

Five.

To achieve accurate three-dimensional navigation using the global positioning system, a minimum of four satellites must be tracked. Each satellite provides information about its position and the time the signal was transmitted. By receiving signals from at least four satellites, the GPS receiver can calculate its own position by trilateration, which involves measuring the distance between the receiver and each satellite. With only three satellites, the receiver can only determine its position in two dimensions. Therefore, tracking four satellites is necessary for accurate three-dimensional navigation.

Explanation

To achieve accurate three-dimensional navigation using the global positioning system, a minimum of four satellites must be tracked. Each satellite provides information about its position and the time the signal was transmitted. By receiving signals from at least four satellites, the GPS receiver can calculate its own position by trilateration, which involves measuring the distance between the receiver and each satellite. With only three satellites, the receiver can only determine its position in two dimensions. Therefore, tracking four satellites is necessary for accurate three-dimensional navigation.

27. (433) The amount of bandwidth required for the operation of a specific card or module in the Promina is known as a

Logical slot.

Logical shelf.

Physical slot.

Physical shelf.

The correct answer is logical slot. In the Promina system, the amount of bandwidth required for a specific card or module is referred to as a logical slot. This term is used to describe the virtual space or capacity allocated for the operation of the card or module within the system. It is different from a physical slot, which refers to the physical location or connector where the card or module is inserted. Similarly, a logical shelf refers to the virtual space or capacity allocated for a group of cards or modules, while a physical shelf refers to the actual physical structure that houses the cards or modules.

Explanation

The correct answer is logical slot. In the Promina system, the amount of bandwidth required for a specific card or module is referred to as a logical slot. This term is used to describe the virtual space or capacity allocated for the operation of the card or module within the system. It is different from a physical slot, which refers to the physical location or connector where the card or module is inserted. Similarly, a logical shelf refers to the virtual space or capacity allocated for a group of cards or modules, while a physical shelf refers to the actual physical structure that houses the cards or modules.

28. (404) What is the time delay of a real-time satellite?

0.1 seconds.

0.6 seconds.

1.0 seconds.

6.0 seconds.

The time delay of a real-time satellite is 0.6 seconds. This means that there is a delay of 0.6 seconds between the transmission of a signal from the satellite and its reception on Earth. This delay is due to the time it takes for the signal to travel the distance between the satellite and Earth.

Explanation

The time delay of a real-time satellite is 0.6 seconds. This means that there is a delay of 0.6 seconds between the transmission of a signal from the satellite and its reception on Earth. This delay is due to the time it takes for the signal to travel the distance between the satellite and Earth.

29. (412) Wavelength division multiplexing assigns each incoming optical signal to a specific

Pseudorandom code.

Frequency of light.

Radio frequency.

Time slot.

Wavelength division multiplexing (WDM) is a technique used in optical communication systems to transmit multiple signals simultaneously over a single optical fiber. It works by assigning each incoming optical signal to a specific frequency of light. This allows multiple signals to be transmitted and received at the same time without interfering with each other. Therefore, the correct answer is frequency of light.

Explanation

Wavelength division multiplexing (WDM) is a technique used in optical communication systems to transmit multiple signals simultaneously over a single optical fiber. It works by assigning each incoming optical signal to a specific frequency of light. This allows multiple signals to be transmitted and received at the same time without interfering with each other. Therefore, the correct answer is frequency of light.

30. (401) Which jack field in the AN/TRC-170's baseband patch panel provides timing and data connections?

Middle.

Center.

Upper.

Lower.

The upper jack field in the AN/TRC-170's baseband patch panel provides timing and data connections.

Explanation

The upper jack field in the AN/TRC-170's baseband patch panel provides timing and data connections.

31. (424) What constellation are the ultrahigh frequency (UHF) follow-on satellites designed to replace?

Global positioning satellite and Inmarsat.

MILSTAR and Defense Satellite Communications System.

Defense Meteorological Program and Commercial satellites.

Fleet satellite communications (FLTSATCOM) and leased satellites (LEASAT).

The ultrahigh frequency (UHF) follow-on satellites are designed to replace the Fleet satellite communications (FLTSATCOM) and leased satellites (LEASAT).

Explanation

The ultrahigh frequency (UHF) follow-on satellites are designed to replace the Fleet satellite communications (FLTSATCOM) and leased satellites (LEASAT).

32. (416) Information contained in the ephemeris data pertain to the

Predicted satellite orbit.

Predicted atmospheric conditions.

Channels through a satellite that are available for use.

Combinations of ground stations that can communicate with each other.

The ephemeris data contains information about the predicted satellite orbit. This means that it provides details about the satellite's position and trajectory in space. By using this data, scientists and engineers can accurately track and predict the satellite's movement, allowing for precise calculations and planning of satellite operations and communications.

Explanation

The ephemeris data contains information about the predicted satellite orbit. This means that it provides details about the satellite's position and trajectory in space. By using this data, scientists and engineers can accurately track and predict the satellite's movement, allowing for precise calculations and planning of satellite operations and communications.

33. (422) Which Milstar antenna provides high gain, selective coverage of any ground station visible on the earth's surface within its own footprint?

Agile beam.

Spot beam.

Gimbaled dish.

Earth coverage.

The spot beam antenna provides high gain, selective coverage of any ground station visible on the earth's surface within its own footprint. This means that it can focus its signal on a specific area or ground station, providing a stronger and more targeted signal compared to other antennas. The agile beam antenna may also provide selective coverage, but it is not specified to cover any ground station visible on the earth's surface. The gimbaled dish antenna and earth coverage antenna do not provide the same level of selective coverage as the spot beam antenna.

Explanation

The spot beam antenna provides high gain, selective coverage of any ground station visible on the earth's surface within its own footprint. This means that it can focus its signal on a specific area or ground station, providing a stronger and more targeted signal compared to other antennas. The agile beam antenna may also provide selective coverage, but it is not specified to cover any ground station visible on the earth's surface. The gimbaled dish antenna and earth coverage antenna do not provide the same level of selective coverage as the spot beam antenna.

34. (426) Which commercial satellite communication system can offer true pole-to-pole global coverage?

European Telecommunications Satellite Organization (EUTELSAT).

International Telecommunications Satellite Organization (INTELSAT).

International Maritime Satellite Organization (Inmarsat).

Iridium Satellite, LLC.

Iridium Satellite, LLC. can offer true pole-to-pole global coverage because it operates a constellation of 66 low Earth orbit (LEO) satellites. These satellites are evenly distributed around the Earth and communicate with each other to provide continuous coverage, including at the poles. This allows Iridium to offer global communication services in remote and polar regions where other satellite systems may not have coverage.

Explanation

Iridium Satellite, LLC. can offer true pole-to-pole global coverage because it operates a constellation of 66 low Earth orbit (LEO) satellites. These satellites are evenly distributed around the Earth and communicate with each other to provide continuous coverage, including at the poles. This allows Iridium to offer global communication services in remote and polar regions where other satellite systems may not have coverage.

35. (401) The quick reaction antenna for the V3 AN/TRC-170 terminal uses

Two 6-foot-diameter, linearly dual-polarized antennas.

Four 6-foot-diameter, linearly dual-polarized antennas.

Two 9.5-foot-diameter, linearly dual-polarized antennas.

Four 9.5-foot-diameter, linearly dual-polarized antennas.

The correct answer is two 6-foot-diameter, linearly dual-polarized antennas. This means that the quick reaction antenna for the V3 AN/TRC-170 terminal uses two antennas that are 6 feet in diameter and have dual polarization.

Explanation

The correct answer is two 6-foot-diameter, linearly dual-polarized antennas. This means that the quick reaction antenna for the V3 AN/TRC-170 terminal uses two antennas that are 6 feet in diameter and have dual polarization.

36. (404) An advantage of passive satellites is that they

Have a larger transmitter power.

Have more sensitive equipment.

Operate as repeater stations in space.

Operate over a wider-frequency range.

Passive satellites are able to operate over a wider-frequency range compared to active satellites. Passive satellites do not have their own power source or onboard electronics, which allows them to be more versatile in terms of the frequencies they can receive and transmit. They can reflect or redirect signals from other sources, making them suitable for various communication purposes. This advantage makes them valuable in applications such as telecommunications, weather monitoring, and scientific research.

Explanation

Passive satellites are able to operate over a wider-frequency range compared to active satellites. Passive satellites do not have their own power source or onboard electronics, which allows them to be more versatile in terms of the frequencies they can receive and transmit. They can reflect or redirect signals from other sources, making them suitable for various communication purposes. This advantage makes them valuable in applications such as telecommunications, weather monitoring, and scientific research.

37. (419) The primary interface between the operator/maintainer and the MARK IVB system is the

Storage disk array.

Maintainer workstation.

Network interface switch.

Meteorological data server.

The primary interface between the operator/maintainer and the MARK IVB system is the maintainer workstation. This suggests that the maintainer workstation is the main tool or device used by the operator/maintainer to interact with and perform tasks on the MARK IVB system. The other options, such as the storage disk array, network interface switch, and meteorological data server, may be components or peripherals of the system, but they are not the primary interface for the operator/maintainer.

Explanation

The primary interface between the operator/maintainer and the MARK IVB system is the maintainer workstation. This suggests that the maintainer workstation is the main tool or device used by the operator/maintainer to interact with and perform tasks on the MARK IVB system. The other options, such as the storage disk array, network interface switch, and meteorological data server, may be components or peripherals of the system, but they are not the primary interface for the operator/maintainer.

38. (420) Which components are major sets of satellite readout station equipment?

Radio frequency set and modulation system controller.

Modulation interface equipment and transmit/receive set.

Modulation interface equipment and modulation system controller.

Radio frequency set, transmit/receiver set, and digital equipment set.

The major sets of satellite readout station equipment include the radio frequency set, which is responsible for receiving and transmitting signals in the appropriate frequency range. The transmit/receiver set is also important as it allows for the transmission and reception of signals. Lastly, the digital equipment set is necessary for processing and analyzing the received data.

Explanation

The major sets of satellite readout station equipment include the radio frequency set, which is responsible for receiving and transmitting signals in the appropriate frequency range. The transmit/receiver set is also important as it allows for the transmission and reception of signals. Lastly, the digital equipment set is necessary for processing and analyzing the received data.

39. (431) Which statement is true about in-service performance monitoring?

It indicates the quality of the operating signal while interrupting the signal.

It verifies the quality of prescribed specifications from terminal to terminal.

It indicates the quality of the operating signal without interrupting the signal.

It is used to make necessary end-to-end adjustments to interface and transmission equipment.

In-service performance monitoring is a method used to assess the quality of the operating signal without interrupting it. This means that the monitoring process does not cause any disruption to the signal being transmitted. By monitoring the signal in real-time, it is possible to identify any issues or deviations from the expected specifications. This allows for prompt detection and resolution of any problems, ensuring that the signal quality remains at the desired level. Additionally, in-service performance monitoring can be used to make necessary adjustments to interface and transmission equipment to optimize the overall performance of the system.

Explanation

In-service performance monitoring is a method used to assess the quality of the operating signal without interrupting it. This means that the monitoring process does not cause any disruption to the signal being transmitted. By monitoring the signal in real-time, it is possible to identify any issues or deviations from the expected specifications. This allows for prompt detection and resolution of any problems, ensuring that the signal quality remains at the desired level. Additionally, in-service performance monitoring can be used to make necessary adjustments to interface and transmission equipment to optimize the overall performance of the system.

40. (435) During a communications unit deployment, at least one person deployed with a Promina system must have what minimum access level assigned in order to bring up the mission?

Level 1.

Level 2.

Level 3.

Level 4.

During a communications unit deployment, at least one person deployed with a Promina system must have a minimum access level assigned in order to bring up the mission. The minimum access level required is Level 4.

Explanation

During a communications unit deployment, at least one person deployed with a Promina system must have a minimum access level assigned in order to bring up the mission. The minimum access level required is Level 4.

41. (401) The tropospheric scatter modem processes mission traffic at data rates of 128 through 4,096 Kbps in the

512 Kbps data rate family.

576 Kbps data rate family.

1,024 Kbps data rate family.

1,152 Kbps data rate family.

The correct answer is 512 Kbps data rate family. This means that the tropospheric scatter modem is capable of processing mission traffic at data rates ranging from 128 Kbps to 4,096 Kbps within the 512 Kbps data rate family.

Explanation

The correct answer is 512 Kbps data rate family. This means that the tropospheric scatter modem is capable of processing mission traffic at data rates ranging from 128 Kbps to 4,096 Kbps within the 512 Kbps data rate family.

42. (418) In the AN/GSC-52 earth terminal's tracking system, what converts the azimuth/elevation (AZ/EL) velocity commands from the antenna control unit into drive power outputs to move the antenna?

Scanner.

Comparator.

Servo amplifier.

Optical converter.

The servo amplifier is responsible for converting the azimuth/elevation (AZ/EL) velocity commands from the antenna control unit into drive power outputs to move the antenna. It amplifies the signals and provides the necessary power to the motors or actuators that control the movement of the antenna. This allows the antenna to accurately track and follow the desired azimuth and elevation angles.

Explanation

The servo amplifier is responsible for converting the azimuth/elevation (AZ/EL) velocity commands from the antenna control unit into drive power outputs to move the antenna. It amplifies the signals and provides the necessary power to the motors or actuators that control the movement of the antenna. This allows the antenna to accurately track and follow the desired azimuth and elevation angles.

43. (401) Which type of diversity requires two antennas, two receivers, and two transmitters?

Polarization.

Crossband.

Frequency.

Space.

Polarization is the correct answer because it requires two antennas, two receivers, and two transmitters. Polarization refers to the orientation of the electromagnetic waves in an antenna. By using two antennas with different polarization orientations, signals can be transmitted and received simultaneously, increasing the diversity and improving the quality of the communication. Crossband refers to the use of different frequency bands, frequency refers to the specific frequency of the signal, and space refers to the spatial diversity using multiple antennas.

Explanation

Polarization is the correct answer because it requires two antennas, two receivers, and two transmitters. Polarization refers to the orientation of the electromagnetic waves in an antenna. By using two antennas with different polarization orientations, signals can be transmitted and received simultaneously, increasing the diversity and improving the quality of the communication. Crossband refers to the use of different frequency bands, frequency refers to the specific frequency of the signal, and space refers to the spatial diversity using multiple antennas.

44. (415) What system supports the National Command Authority and provides all-service (Army, Navy, and Air Force) communication for interoperable command, control, and communications (C3) at all levels of conflict?

Defense Satellite Communications System.

Global Positioning System.

Defense Support Program.

Milstar.

Milstar is the correct answer because it is a system that supports the National Command Authority and provides all-service communication for interoperable command, control, and communications (C3) at all levels of conflict. The Defense Satellite Communications System, Global Positioning System, and Defense Support Program are not specifically designed for this purpose.

Explanation

Milstar is the correct answer because it is a system that supports the National Command Authority and provides all-service communication for interoperable command, control, and communications (C3) at all levels of conflict. The Defense Satellite Communications System, Global Positioning System, and Defense Support Program are not specifically designed for this purpose.

45. (418) Which feedhorns are located in the AN/GSC-52 earth terminal feed assembly?

Single tracking and communication feedhorn.

One tracking feedhorn and one communications feedhorn.

One tracking feedhorn and four communications feedhorns.

Four tracking feedhorns and one communication feedhorn.

The AN/GSC-52 earth terminal feed assembly contains four tracking feedhorns and one communication feedhorn. This means that there are multiple feedhorns used for tracking purposes and only one feedhorn used for communication.

Explanation

The AN/GSC-52 earth terminal feed assembly contains four tracking feedhorns and one communication feedhorn. This means that there are multiple feedhorns used for tracking purposes and only one feedhorn used for communication.

46. (418) In the event of a downconverter failure in the AN/GSC-52 earth terminal, the downconverter

Switch assembly (under TS-A control) automatically places a space online.

Alarm monitor (under TS-A control) automatically places a spare online.

Controller (under TS-A control) automatically places a space online.

Space must be configured and placed online manually.

The correct answer is the switch assembly (under TS-A control) automatically places a space online. This means that in the event of a downconverter failure in the AN/GSC-52 earth terminal, the switch assembly will automatically activate and connect a spare space to ensure uninterrupted communication.

Explanation

The correct answer is the switch assembly (under TS-A control) automatically places a space online. This means that in the event of a downconverter failure in the AN/GSC-52 earth terminal, the switch assembly will automatically activate and connect a spare space to ensure uninterrupted communication.

47. (419) Which Defense Meteorological Satellite Program elements receive only real-time satellite imagery when the satellite is in view?

Strategic.

Tactical.

Air Force Weather Agency.

Automated Remote Tracking Stations.

The Defense Meteorological Satellite Program elements that receive only real-time satellite imagery when the satellite is in view are the Tactical elements. This means that the Tactical elements do not have access to stored or archived imagery, but only receive the imagery in real-time while the satellite is in view.

Explanation

The Defense Meteorological Satellite Program elements that receive only real-time satellite imagery when the satellite is in view are the Tactical elements. This means that the Tactical elements do not have access to stored or archived imagery, but only receive the imagery in real-time while the satellite is in view.

48. (419) The MARK IVB antennas can be located up to how many feet away from the processing area?

1,000.

1,500.

2,500.

3,000.

The MARK IVB antennas can be located up to 1,500 feet away from the processing area.

Explanation

The MARK IVB antennas can be located up to 1,500 feet away from the processing area.

49. (422) What Milstar capability is very different from previous military satellite communications (MILSATCOM) and commercial satellite communications systems?

Crossbanding.

Crosslinking.

Multi-service.

Secure networking.

Crosslinking is the correct answer because it refers to the capability of a Milstar satellite to directly communicate with another Milstar satellite without the need for a ground station. This is a significant departure from previous military and commercial satellite communication systems, which relied on ground stations to relay signals between satellites. Crosslinking allows for faster and more secure communication between Milstar satellites, making it a unique capability compared to other systems.

Explanation

Crosslinking is the correct answer because it refers to the capability of a Milstar satellite to directly communicate with another Milstar satellite without the need for a ground station. This is a significant departure from previous military and commercial satellite communication systems, which relied on ground stations to relay signals between satellites. Crosslinking allows for faster and more secure communication between Milstar satellites, making it a unique capability compared to other systems.

50. (422) What type of extremely high frequency (EHF) antenna is used on the Milstar EHF/UHF airborne command post terminals?

16-inch Cassegrain.

26-inch Cassegrain.

16-inch front-feed.

26-inch front-feed.

The Milstar EHF/UHF airborne command post terminals use a 26-inch Cassegrain antenna. This type of antenna is designed to operate at extremely high frequencies (EHF) and is commonly used in satellite communication systems. The 26-inch size refers to the diameter of the main reflector dish, which helps to focus and direct the radio waves for better signal reception and transmission. The Cassegrain design includes a smaller secondary reflector that captures the focused waves and directs them to the receiver or transmitter, allowing for efficient communication in the EHF range.

Explanation

The Milstar EHF/UHF airborne command post terminals use a 26-inch Cassegrain antenna. This type of antenna is designed to operate at extremely high frequencies (EHF) and is commonly used in satellite communication systems. The 26-inch size refers to the diameter of the main reflector dish, which helps to focus and direct the radio waves for better signal reception and transmission. The Cassegrain design includes a smaller secondary reflector that captures the focused waves and directs them to the receiver or transmitter, allowing for efficient communication in the EHF range.

51. (431) Which term is defined as measures taken to ensure the continued use of the frequency spectrum by Department of Defense and friendly forces?

Electronic attack (EA).

Electronic warfare (EW).

Electronic support (ES).

Counter-counter measures (CCM).

Counter-counter measures (CCM) refers to measures taken to ensure the continued use of the frequency spectrum by the Department of Defense and friendly forces. This term specifically addresses the actions taken to counter any electronic attack (EA) or electronic warfare (EW) tactics that may be employed by the enemy. It involves implementing strategies and technologies to neutralize or mitigate the effects of electronic threats, thereby safeguarding the frequency spectrum for the use of friendly forces. Electronic support (ES) refers to actions taken to gather intelligence from the electromagnetic spectrum, while electronic attack (EA) and electronic warfare (EW) are offensive measures aimed at disrupting or disabling enemy electronic systems.

Explanation

Counter-counter measures (CCM) refers to measures taken to ensure the continued use of the frequency spectrum by the Department of Defense and friendly forces. This term specifically addresses the actions taken to counter any electronic attack (EA) or electronic warfare (EW) tactics that may be employed by the enemy. It involves implementing strategies and technologies to neutralize or mitigate the effects of electronic threats, thereby safeguarding the frequency spectrum for the use of friendly forces. Electronic support (ES) refers to actions taken to gather intelligence from the electromagnetic spectrum, while electronic attack (EA) and electronic warfare (EW) are offensive measures aimed at disrupting or disabling enemy electronic systems.

52. (401) Digital voice orderwire traffic that originates at the AN/TRC-170's voice orderwire control unit is encrypted by the

KY-68 digital secure voice terminal/phone.

KY-58 VINSON encryption device.

KG-84 dedicated loop encryption device.

KG-81 trunk encryption device.

The correct answer is the KY-58 VINSON encryption device. This device is used to encrypt digital voice orderwire traffic that originates at the AN/TRC-170's voice orderwire control unit. The KY-58 VINSON encryption device is specifically designed for secure voice communications and ensures that the transmitted information remains confidential and protected from unauthorized access.

Explanation

The correct answer is the KY-58 VINSON encryption device. This device is used to encrypt digital voice orderwire traffic that originates at the AN/TRC-170's voice orderwire control unit. The KY-58 VINSON encryption device is specifically designed for secure voice communications and ensures that the transmitted information remains confidential and protected from unauthorized access.

53. (405) What satellite access technique was the first multiple access method developed?

Code division multiple access (CDMA).

Time division multiple access (TDMA).

Demand assigned multiple access (DAMA).

Frequency division multiple access (FDMA).

FDMA was the first multiple access method developed. In FDMA, the available frequency spectrum is divided into multiple non-overlapping frequency bands, and each user is allocated a specific frequency band for communication. This allows multiple users to share the same physical medium by using different frequency bands.

Explanation

FDMA was the first multiple access method developed. In FDMA, the available frequency spectrum is divided into multiple non-overlapping frequency bands, and each user is allocated a specific frequency band for communication. This allows multiple users to share the same physical medium by using different frequency bands.

54. (422) Which element of the Milstar mission allocates communication resources?

Development.

Planning.

Support.

Control.

The element of the Milstar mission that allocates communication resources is "Planning." Planning involves the process of determining how communication resources will be distributed and utilized effectively to meet the mission's objectives. This includes identifying the needs of different users, coordinating communication schedules, and ensuring efficient allocation of resources to support the mission's requirements.

Explanation

The element of the Milstar mission that allocates communication resources is "Planning." Planning involves the process of determining how communication resources will be distributed and utilized effectively to meet the mission's objectives. This includes identifying the needs of different users, coordinating communication schedules, and ensuring efficient allocation of resources to support the mission's requirements.

55. (401) In an AN/TRC-170 terminal, the quantity of digital group multiplexer units supplied and their application are

Different in the V2 and V3 systems.

Identical in the V2 and V3 systems.

Dependent on the mission and number of channels.

Dependent on the deployment of the technical control.

The correct answer is "identical in the V2 and V3 systems." This means that the quantity of digital group multiplexer units supplied and their application are the same in both the V2 and V3 systems. There is no difference between the two versions when it comes to the digital group multiplexer units.

Explanation

The correct answer is "identical in the V2 and V3 systems." This means that the quantity of digital group multiplexer units supplied and their application are the same in both the V2 and V3 systems. There is no difference between the two versions when it comes to the digital group multiplexer units.

56. (406) One degree of arc on the Earth's surface equals

One statute mile.

One nautical mile.

69 statute miles.

69 nautical miles.

One degree of arc on the Earth's surface equals 69 statute miles. This is a commonly used measurement in navigation and geography. The distance of one degree of arc varies depending on the latitude, but on average it is approximately 69 statute miles.

Explanation

One degree of arc on the Earth's surface equals 69 statute miles. This is a commonly used measurement in navigation and geography. The distance of one degree of arc varies depending on the latitude, but on average it is approximately 69 statute miles.

57. (415) Which early warning center receives Defense Support Program warning data from the 460th Space Wing units?

Air Force Weather Agency.

Mission Control Squadron.

Mission Control Command.

North American Aerospace Defense Command.

The North American Aerospace Defense Command (NORAD) receives Defense Support Program warning data from the 460th Space Wing units. NORAD is responsible for aerospace warning and control, and it operates a network of sensors and satellites to detect and track potential threats to North America. The 460th Space Wing units provide early warning of missile launches and other space-related activities. Therefore, it is logical that NORAD would receive warning data from these units to fulfill its mission of defending North American airspace.

Explanation

The North American Aerospace Defense Command (NORAD) receives Defense Support Program warning data from the 460th Space Wing units. NORAD is responsible for aerospace warning and control, and it operates a network of sensors and satellites to detect and track potential threats to North America. The 460th Space Wing units provide early warning of missile launches and other space-related activities. Therefore, it is logical that NORAD would receive warning data from these units to fulfill its mission of defending North American airspace.

58. (416) Which tracking method requires no input from a satellite?

Programmed track.

Automatic track.

Pseudoconscan.

Step track.

Programmed track is a tracking method that does not require any input from a satellite. It involves pre-programming the desired path or trajectory into the tracking system, and the system then follows this programmed track without the need for continuous satellite input. This method is often used in situations where satellite communication may be limited or unavailable, such as in remote or isolated areas.

Explanation

Programmed track is a tracking method that does not require any input from a satellite. It involves pre-programming the desired path or trajectory into the tracking system, and the system then follows this programmed track without the need for continuous satellite input. This method is often used in situations where satellite communication may be limited or unavailable, such as in remote or isolated areas.

59. (417) The intermediate frequencies/levels used by Defense Satellite Communications System (DSCS) earth terminals are 70 MHz at

-10 dBm and 630 MHz @ -13 dBm.

-13 dBm and 630 MHz @ -10 dBm.

-10 dBm and 700 MHz @ -13 dBm.

-13 dBm and 700 MHz @ -10 dBm.

The correct answer is -10 dBm and 700 MHz @ -13 dBm. This answer is correct because it matches the given information in the question. The question states that the intermediate frequencies/levels used by Defense Satellite Communications System (DSCS) earth terminals are 70 MHz at -10 dBm and 630 MHz at -13 dBm. The answer choice -10 dBm and 700 MHz @ -13 dBm matches this information exactly.

Explanation

The correct answer is -10 dBm and 700 MHz @ -13 dBm. This answer is correct because it matches the given information in the question. The question states that the intermediate frequencies/levels used by Defense Satellite Communications System (DSCS) earth terminals are 70 MHz at -10 dBm and 630 MHz at -13 dBm. The answer choice -10 dBm and 700 MHz @ -13 dBm matches this information exactly.

60. (418) How are the high power amplifiers normally configured in the AN/GSC-52 earth terminal?

One active online with three in standby mode.

Two active online with two in standby mode.

Three active online with one in standby mode.

Four active online with none in standby mode.

In the AN/GSC-52 earth terminal, the high power amplifiers are configured with three active online and one in standby mode. This means that three amplifiers are actively functioning and providing power, while one amplifier is kept in standby mode as a backup. This configuration ensures redundancy and allows for uninterrupted operation in case of any failure or maintenance requirements.

Explanation

In the AN/GSC-52 earth terminal, the high power amplifiers are configured with three active online and one in standby mode. This means that three amplifiers are actively functioning and providing power, while one amplifier is kept in standby mode as a backup. This configuration ensures redundancy and allows for uninterrupted operation in case of any failure or maintenance requirements.

61. (430) With what agency does the regional satellite communications support center (RSSC) coordinate for additional satellite resources if the planned deployment configuration cannot be supported by the satellite payload configuration?

Ground mobile forces (GMF) network controller.

Consolidated space operations center.

Defense Information Systems Agency (DISA).

Defense Information System Agency Network Operations Center (DISANOC).

The regional satellite communications support center (RSSC) coordinates with the Defense Information Systems Agency (DISA) for additional satellite resources if the planned deployment configuration cannot be supported by the satellite payload configuration. DISA is responsible for providing information technology and communications support to the Department of Defense, and they have the authority to allocate additional satellite resources to meet the needs of the RSSC.

Explanation

The regional satellite communications support center (RSSC) coordinates with the Defense Information Systems Agency (DISA) for additional satellite resources if the planned deployment configuration cannot be supported by the satellite payload configuration. DISA is responsible for providing information technology and communications support to the Department of Defense, and they have the authority to allocate additional satellite resources to meet the needs of the RSSC.

62. (402) The Tropo/Satellite Support Radio frequency coverage extends from

4.4 to 5.25 GHz.

7.25 to 8.4 GHz.

14.4 to 15.25 GHz.

17.25 to 18.4 GHz.

The correct answer is 14.4 to 15.25 GHz. This is because the Tropo/Satellite Support Radio frequency coverage extends to this range.

Explanation

The correct answer is 14.4 to 15.25 GHz. This is because the Tropo/Satellite Support Radio frequency coverage extends to this range.

63. (432) We refer to the physical interface between the Promina and the customer's voice devices as a

Port.

Trunk.

Digroup.

Backplane.

The term "digroup" refers to a digital group, which is a logical grouping of channels that allows for the transmission of voice or data signals between the Promina device and the customer's voice devices. This term is commonly used in telecommunications to describe the interface between different systems or devices. In this context, it is used to describe the physical interface between the Promina and the customer's voice devices.

Explanation

The term "digroup" refers to a digital group, which is a logical grouping of channels that allows for the transmission of voice or data signals between the Promina device and the customer's voice devices. This term is commonly used in telecommunications to describe the interface between different systems or devices. In this context, it is used to describe the physical interface between the Promina and the customer's voice devices.

64. (416) What sequence of events must you follow when establishing a communication link with a satellite?

Frequency acquisition, space acquisition, antenna pointing, and satellite tracking.

Satellite acquisition, satellite tracking, power correction, and antenna pointing.

Orbit prediction, antenna pointing, satellite acquisition, and satellite tracking.

Orbit prediction, space acquisition, and frequency acquisition.

not-available-via-ai

Explanation

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65. (423) Modifications on the Defense Satellite Communications System phase III (DSCS III) satellite include

Larger solar panels.

Smaller solar panels.

Multibeam array antenna.

Single-channel transponder (SCT) downlink.

The modifications on the Defense Satellite Communications System phase III (DSCS III) satellite include a single-channel transponder (SCT) downlink. This means that the satellite has been upgraded to have a single-channel transponder for transmitting signals back to Earth. The other options, such as larger or smaller solar panels and a multibeam array antenna, are not mentioned as part of the modifications.

Explanation

The modifications on the Defense Satellite Communications System phase III (DSCS III) satellite include a single-channel transponder (SCT) downlink. This means that the satellite has been upgraded to have a single-channel transponder for transmitting signals back to Earth. The other options, such as larger or smaller solar panels and a multibeam array antenna, are not mentioned as part of the modifications.

66. (429) One of the functions of the telecommunications certification office is to

Assign a circuit number to the telecommunications service request.

Ensure the user agency is prepared to pay for the service.

Review the circuit priority against mission needs.

Maintain case files on all MAJCOM circuits.

The function of the telecommunications certification office is to ensure that the user agency is prepared to pay for the service. This suggests that the office is responsible for verifying that the user agency has the necessary funds or budget in place before providing the requested telecommunications service. This ensures that the agency can financially support the service and prevents any potential issues or delays in payment.

Explanation

The function of the telecommunications certification office is to ensure that the user agency is prepared to pay for the service. This suggests that the office is responsible for verifying that the user agency has the necessary funds or budget in place before providing the requested telecommunications service. This ensures that the agency can financially support the service and prevents any potential issues or delays in payment.

67. (401) When using space diversity, the AN/TRC-170 receive antenna spacing should be a minimum of

10 wavelengths apart.

25 wavelengths apart.

50 wavelengths apart.

100 wavelengths apart.

Space diversity is a technique used to improve the reliability of wireless communication by using multiple antennas spaced apart. The AN/TRC-170 receive antenna spacing should be a minimum of 50 wavelengths apart. This spacing ensures that the antennas receive independent signals, reducing the chances of both antennas being affected by the same interference or fading. By spacing the antennas at this distance, the system can effectively mitigate signal degradation and improve overall communication performance.

Explanation

Space diversity is a technique used to improve the reliability of wireless communication by using multiple antennas spaced apart. The AN/TRC-170 receive antenna spacing should be a minimum of 50 wavelengths apart. This spacing ensures that the antennas receive independent signals, reducing the chances of both antennas being affected by the same interference or fading. By spacing the antennas at this distance, the system can effectively mitigate signal degradation and improve overall communication performance.

68. (412) What technique of multiplexing samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?

Wavelength division.

Frequency division.

Code division.

Time division.

Time division multiplexing (TDM) is a technique that samples each low-speed channel in sequence, interweaves the bits or characters, and then transmits them at a high speed. This is achieved by dividing the transmission time into small time slots and assigning each low-speed channel to a specific time slot. By doing so, multiple channels can share the same transmission medium without interfering with each other. Therefore, the correct answer is time division.

Explanation

Time division multiplexing (TDM) is a technique that samples each low-speed channel in sequence, interweaves the bits or characters, and then transmits them at a high speed. This is achieved by dividing the transmission time into small time slots and assigning each low-speed channel to a specific time slot. By doing so, multiple channels can share the same transmission medium without interfering with each other. Therefore, the correct answer is time division.

69. (420) Which agency is responsible for Defense Support Program operational control?

HQ AFSPC.

HQ AFPC (10 AF).

SPACEAF (14 AF).

USSTRATCOM/CC,

The correct answer is SPACEAF (14 AF). SPACEAF, also known as the 14th Air Force, is responsible for Defense Support Program operational control. This agency is specifically dedicated to space operations and is responsible for providing space-based capabilities to support national security objectives.

Explanation

The correct answer is SPACEAF (14 AF). SPACEAF, also known as the 14th Air Force, is responsible for Defense Support Program operational control. This agency is specifically dedicated to space operations and is responsible for providing space-based capabilities to support national security objectives.

70. (421) What is the number of global positioning system orbital planes?

Four.

Five.

Six.

Seven.

There are six global positioning system orbital planes.

Explanation

There are six global positioning system orbital planes.

71. (435) Which Promina menu contains commands for managing operators and the operator console?

Prolog.

Action.

Object.

Functional area.

The correct answer is Prolog. Prolog is a menu in the Promina system that contains commands for managing operators and the operator console. It is specifically designed to handle tasks related to operator management and console operations.

Explanation

The correct answer is Prolog. Prolog is a menu in the Promina system that contains commands for managing operators and the operator console. It is specifically designed to handle tasks related to operator management and console operations.

72. (401) The MD-1026 digital data modem can interface up to four groups of

Balanced non-return-to-zero (NRZ) signals.

Conditioned diphase signals.

Unbalanced NRZ signals.

Isochronous signals.

The MD-1026 digital data modem is capable of interfacing with conditioned diphase signals. This means that it can effectively communicate and exchange data with signals that have been conditioned and encoded using the diphase modulation technique. The modem is not designed to interface with balanced non-return-to-zero (NRZ) signals, unbalanced NRZ signals, or isochronous signals.

Explanation

The MD-1026 digital data modem is capable of interfacing with conditioned diphase signals. This means that it can effectively communicate and exchange data with signals that have been conditioned and encoded using the diphase modulation technique. The modem is not designed to interface with balanced non-return-to-zero (NRZ) signals, unbalanced NRZ signals, or isochronous signals.

73. (418) The AN/GSC-52 earth terminal's frequency and timing subsystem provides precise 1pps timing signals and precise frequency outputs of

1 kHz and 5 MHz.

1 MHz and 5kHz.

1 MHz and 5 MHz.

5 MHz and 10 MHz.

The AN/GSC-52 earth terminal's frequency and timing subsystem provides precise 1pps timing signals and precise frequency outputs of 1 MHz and 5 MHz.

Explanation

The AN/GSC-52 earth terminal's frequency and timing subsystem provides precise 1pps timing signals and precise frequency outputs of 1 MHz and 5 MHz.

74. (419) What are the Air Force Satellite Control Network (AFSCN) command and control nodes?

Environmental Satellite Operations Center at Schriever AFB, CO, and Multi Purpose Satellite Operations Center, Offutt AFB, NB.

Air Force Weather Agency, Offutt AFB, NB, and NOAA Satellite Operations Control Center at Suitland, MD.

Air Force Weather Agency, Offutt AFB, NB, and Multi Purpose Satellite Operations Center, Offutt AFB, NB.

The Air Force Satellite Control Network (AFSCN) command and control nodes consist of the Environmental Satellite Operations Center at Schriever AFB, CO, and the National Oceanographic and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD. These two centers are responsible for managing and controlling the operations of the Air Force satellites and environmental satellites, ensuring their proper functioning and data collection.

Explanation

The Air Force Satellite Control Network (AFSCN) command and control nodes consist of the Environmental Satellite Operations Center at Schriever AFB, CO, and the National Oceanographic and Atmospheric Administration (NOAA) Satellite Operations Control Center at Suitland, MD. These two centers are responsible for managing and controlling the operations of the Air Force satellites and environmental satellites, ensuring their proper functioning and data collection.

75. (422) The Milstar satellite sends downlink communications transmissions at

Ultrahigh frequency (UHF) only.

Extremely high frequency (EHF) only.

UHF and super-high frequency (SHF).

UHF and EHF.

The Milstar satellite sends downlink communications transmissions at UHF and super-high frequency (SHF). This means that it uses both UHF and SHF to transmit its communications signals. UHF is a frequency range commonly used for long-range communications, while SHF is used for shorter-range, high-capacity communications. By utilizing both frequencies, the Milstar satellite can ensure reliable and efficient communication over various distances and scenarios.

Explanation

The Milstar satellite sends downlink communications transmissions at UHF and super-high frequency (SHF). This means that it uses both UHF and SHF to transmit its communications signals. UHF is a frequency range commonly used for long-range communications, while SHF is used for shorter-range, high-capacity communications. By utilizing both frequencies, the Milstar satellite can ensure reliable and efficient communication over various distances and scenarios.

76. (425) Which service is not provided by the commercial satellite communications branch (CSB)?

Help obtain host nation approvals.

Recommend and/or obtain ground terminals.

Act as the day-to-day mobile satellite services (MSS) system manager.

Evaluate customer requests to see if commercial service is the best option.

The commercial satellite communications branch (CSB) provides various services, including helping to obtain host nation approvals, recommending and obtaining ground terminals, and evaluating customer requests for the best commercial service option. However, it does not act as the day-to-day mobile satellite services (MSS) system manager. This means that the CSB does not have the responsibility of managing the day-to-day operations and maintenance of the MSS system.

Explanation

The commercial satellite communications branch (CSB) provides various services, including helping to obtain host nation approvals, recommending and obtaining ground terminals, and evaluating customer requests for the best commercial service option. However, it does not act as the day-to-day mobile satellite services (MSS) system manager. This means that the CSB does not have the responsibility of managing the day-to-day operations and maintenance of the MSS system.

77. (427) Which type of communications would not normally be provided through commercial wideband services?

Very small aperture terminal networks.

International high-speed internet connectivity.

Handheld satellite phone communications.

Deployable video teleconferencing.

Handheld satellite phone communications would not normally be provided through commercial wideband services. While commercial wideband services typically offer high-speed internet connectivity and video teleconferencing options, handheld satellite phone communications involve the use of specialized satellite phones that operate on different frequencies and require specific infrastructure. These services are typically provided by satellite phone service providers rather than commercial wideband service providers.

Explanation

Handheld satellite phone communications would not normally be provided through commercial wideband services. While commercial wideband services typically offer high-speed internet connectivity and video teleconferencing options, handheld satellite phone communications involve the use of specialized satellite phones that operate on different frequencies and require specific infrastructure. These services are typically provided by satellite phone service providers rather than commercial wideband service providers.

78. (416) Telemetry refers to

A low power signal transmitted from the satellite and is separate from the communications components.

A low power signal transmitted from the satellite and is part of the communications components.

The data transmitted by the satellite concerning on-board status and is separate from the communications components.

The data transmitted by the satellite concerning on-board status and is part of the communications components.

Telemetry refers to the data transmitted by the satellite concerning on-board status and is separate from the communications components. This means that telemetry is a separate signal from the communication components and is specifically used to transmit data about the satellite's on-board status.

Explanation

Telemetry refers to the data transmitted by the satellite concerning on-board status and is separate from the communications components. This means that telemetry is a separate signal from the communication components and is specifically used to transmit data about the satellite's on-board status.

79. (417) The downlink frequency range of the Defense Satellite Communications System (DSCS) is

7.25 to 7.75 MHz.

7.25 to 7.75 GHz.

7.9 to 8.4 MHz.

7.9 to 8.4 GHz.

The correct answer is 7.25 to 7.75 GHz. The Defense Satellite Communications System (DSCS) operates in the microwave frequency range, which is typically in the GHz range. The given frequency range falls within this range, making it the correct answer. The other frequency ranges mentioned (MHz) are in the lower frequency range and are not consistent with the typical frequency range used by satellite communication systems like DSCS.

Explanation

The correct answer is 7.25 to 7.75 GHz. The Defense Satellite Communications System (DSCS) operates in the microwave frequency range, which is typically in the GHz range. The given frequency range falls within this range, making it the correct answer. The other frequency ranges mentioned (MHz) are in the lower frequency range and are not consistent with the typical frequency range used by satellite communication systems like DSCS.

80. (429) Who submits a feeder telecommunications service request to start, stop, or change circuits, trunks, links, or systems?

Department of Defense (DOD).

The users' technical control facility.

Defense Information Systems Agency (DISA).

The distant end technical control facility.

The users' technical control facility submits a feeder telecommunications service request to start, stop, or change circuits, trunks, links, or systems.

Explanation

The users' technical control facility submits a feeder telecommunications service request to start, stop, or change circuits, trunks, links, or systems.

81. (401) Which type of encryption device does full-duplex encryption of AN/TRC-170's groups or supergroup mission traffic?

KY-68 digital secure voice terminal/phone.

KY-58 VINSON.

KG-84 dedicated loop encryption device.

KG-81 trunk encryption device.

The KG-81 trunk encryption device is the correct answer because it is specifically designed for full-duplex encryption of mission traffic in AN/TRC-170's groups or supergroup. The other options, such as KY-68, KY-58, and KG-84, are not mentioned to have this capability. Therefore, the KG-81 trunk encryption device is the most suitable choice for this scenario.

Explanation

The KG-81 trunk encryption device is the correct answer because it is specifically designed for full-duplex encryption of mission traffic in AN/TRC-170's groups or supergroup. The other options, such as KY-68, KY-58, and KG-84, are not mentioned to have this capability. Therefore, the KG-81 trunk encryption device is the most suitable choice for this scenario.

82. (416) Automatic tracking systems are superior to programmed tracking systems because they

Use servomechanisms to control antenna movements.

Track only signals received from the satellite.

Track the actual position of the satellite.

Use updated ephemeris data.

Automatic tracking systems are superior to programmed tracking systems because they track only signals received from the satellite. This means that the automatic tracking system is able to accurately follow the satellite's movements and adjust the antenna accordingly, ensuring a more precise and reliable tracking. In contrast, programmed tracking systems may rely on pre-determined instructions or data, which may not always accurately reflect the actual position of the satellite. Therefore, by tracking only the signals received from the satellite, automatic tracking systems are able to provide more accurate and up-to-date tracking information.

Explanation

Automatic tracking systems are superior to programmed tracking systems because they track only signals received from the satellite. This means that the automatic tracking system is able to accurately follow the satellite's movements and adjust the antenna accordingly, ensuring a more precise and reliable tracking. In contrast, programmed tracking systems may rely on pre-determined instructions or data, which may not always accurately reflect the actual position of the satellite. Therefore, by tracking only the signals received from the satellite, automatic tracking systems are able to provide more accurate and up-to-date tracking information.

83. (422) Encoding/decoding of a digital signal

Quadruples the data rate.

Increases the signal-to-noise-ratio.

Decreases the signal-to-noise-ratio.

Enhances the link bit error rate.

Encoding/decoding of a digital signal can introduce errors or distortions in the signal, resulting in a higher bit error rate. This means that the number of errors in the received signal will increase, affecting the overall quality and reliability of the link. Therefore, the correct answer is "enhances the link bit error rate."

Explanation

Encoding/decoding of a digital signal can introduce errors or distortions in the signal, resulting in a higher bit error rate. This means that the number of errors in the received signal will increase, affecting the overall quality and reliability of the link. Therefore, the correct answer is "enhances the link bit error rate."

84. (428) The Predator ground control station (GCS) satellite communications (SATCOM) subsystem provides one full-duplex encrypted digital voice channel, command and control (C2) capability of four remotely piloted aircraft, and operates over a

Ku-band satellite.

Ka-band satellite.

C-band satellite.

X-band satellite.

The Predator ground control station (GCS) satellite communications (SATCOM) subsystem provides one full-duplex encrypted digital voice channel, command and control (C2) capability of four remotely piloted aircraft, and operates over a Ku-band satellite. This means that the GCS uses a Ku-band satellite for its communication needs. The Ku-band is a frequency range commonly used for satellite communication, offering a good balance between signal strength and atmospheric interference.

Explanation

The Predator ground control station (GCS) satellite communications (SATCOM) subsystem provides one full-duplex encrypted digital voice channel, command and control (C2) capability of four remotely piloted aircraft, and operates over a Ku-band satellite. This means that the GCS uses a Ku-band satellite for its communication needs. The Ku-band is a frequency range commonly used for satellite communication, offering a good balance between signal strength and atmospheric interference.

85. (429) Telecommunications circuit restoration is normally done

By the user.

By rerouting to spare channels.

Within five minutes of circuit failure.

By automatic fault location equipment.

Telecommunications circuit restoration is typically done by rerouting to spare channels. When a circuit fails, the system automatically switches to alternative channels that are not being used, ensuring uninterrupted communication. This method allows for a quick and efficient restoration of the circuit without relying on manual intervention.

Explanation

Telecommunications circuit restoration is typically done by rerouting to spare channels. When a circuit fails, the system automatically switches to alternative channels that are not being used, ensuring uninterrupted communication. This method allows for a quick and efficient restoration of the circuit without relying on manual intervention.

86. (417) In the AN/GSC-52 earth terminal, the down converter normally dedicated for tracking is downconverter

1 in Downconverter Rack 1.

8 in Downconverter Rack 1.

1 in Downconverter Rack 7.

8 in Downconverter Rank 7.

In the AN/GSC-52 earth terminal, the down converter that is normally dedicated for tracking is located in Downconverter Rack 1.

Explanation

In the AN/GSC-52 earth terminal, the down converter that is normally dedicated for tracking is located in Downconverter Rack 1.

87. (423) The Defense Satellite Communications System phase III (DSCS III) S-band system is primarily used for

Satellite telemetry, tracking, and control.

Broadcasting emergency action messages (EAM).

A super high frequency (SHF) communication link.

An extremely high frequency (EHF) communication link.

The Defense Satellite Communications System phase III (DSCS III) S-band system is primarily used for satellite telemetry, tracking, and control. This means that it is used to monitor and control satellites in space, as well as track their movements and gather data from them. It is not used for broadcasting emergency action messages (EAM), super high frequency (SHF) communication link, or an extremely high frequency (EHF) communication link.

Explanation

The Defense Satellite Communications System phase III (DSCS III) S-band system is primarily used for satellite telemetry, tracking, and control. This means that it is used to monitor and control satellites in space, as well as track their movements and gather data from them. It is not used for broadcasting emergency action messages (EAM), super high frequency (SHF) communication link, or an extremely high frequency (EHF) communication link.

88. (434) The Promina signaling channel link protocol trunk module

Provides asymmetric trunking capability.

Is the sole means by which nodes communicate with each other.

Operates in two modes, the "span mode" and the "tandem mode."

The Promina signaling channel link protocol trunk module is the sole means by which nodes communicate with each other. This means that without this module, nodes would not be able to communicate with each other.

Explanation

The Promina signaling channel link protocol trunk module is the sole means by which nodes communicate with each other. This means that without this module, nodes would not be able to communicate with each other.

89. (415) For an operational mission, the purpose of the global positioning system user segment is to enable users to

Actively receive satellite broadcast position, velocity, and time data.

Actively transmit satellite broadcast position, velocity, and time data.

Passively receive satellite broadcast position, velocity, and time data.

Passively transmit satellite broadcast position, velocity, and time data.

The purpose of the global positioning system user segment is to enable users to passively receive satellite broadcast position, velocity, and time data. This means that users do not actively transmit any data, but rather receive the satellite broadcast data that provides them with information about their position, velocity, and time.

Explanation

The purpose of the global positioning system user segment is to enable users to passively receive satellite broadcast position, velocity, and time data. This means that users do not actively transmit any data, but rather receive the satellite broadcast data that provides them with information about their position, velocity, and time.

90. (418) In the AN/GSC-52, the upconverter or downconverter normally dedicated to automatic switchover is in rack position number

1.

2.

7.

8.

In the AN/GSC-52, the upconverter or downconverter normally dedicated to automatic switchover is located in rack position number 8. This means that the equipment responsible for automatically switching between upconversion and downconversion is housed in the eighth rack position.

Explanation

In the AN/GSC-52, the upconverter or downconverter normally dedicated to automatic switchover is located in rack position number 8. This means that the equipment responsible for automatically switching between upconversion and downconversion is housed in the eighth rack position.

91. (425) When considering the factor of service area for commercial satellite services, which description is true about Ku-band service?

Not worldwide, located primarily over land masses and highly populated areas.

Not worldwide, located primarily over ocean areas and lowly populated areas.

Worldwide between roughly 65 degrees North and 65 degrees South latitudes.

Worldwide, located primarily over land masses and highly populated areas.

Ku-band service for commercial satellite services is not available worldwide. It is primarily located over land masses and highly populated areas.

Explanation

Ku-band service for commercial satellite services is not available worldwide. It is primarily located over land masses and highly populated areas.

92. (429) Command communications service designators (CCSD) are divided into two classes;

Continental United States (CONUS) and overseas.

Primary and secondary.

Permanent and temporary.

Terrestrial and extra-terrestrial.

The correct answer is "permanent and temporary." Command communications service designators (CCSD) are divided into these two classes to differentiate between the duration of the service. Permanent CCSDs are assigned to locations or units that require continuous communication services, while temporary CCSDs are assigned for a specific period or event. This classification helps in managing and organizing communication services efficiently based on their duration requirements.

Explanation

The correct answer is "permanent and temporary." Command communications service designators (CCSD) are divided into these two classes to differentiate between the duration of the service. Permanent CCSDs are assigned to locations or units that require continuous communication services, while temporary CCSDs are assigned for a specific period or event. This classification helps in managing and organizing communication services efficiently based on their duration requirements.

93. (423) What agency ensures all satellite links perform according to baseline parameters?

United States Army Space and Missile Defense Command/Army Forces Strategic Command.

Defense Satellite Communications System operations centers (DSCSOC).

Unified and specified combatant commanders (COCOM).

Air Force Space Command (AFSPC).

The Defense Satellite Communications System operations centers (DSCSOC) ensure that all satellite links perform according to baseline parameters.

Explanation

The Defense Satellite Communications System operations centers (DSCSOC) ensure that all satellite links perform according to baseline parameters.

94. (424) Which satellite system provides Global Broadcast Services (GBS)?

Commercial L-band.

Defense Meteorological.

Global positioning satellite.

Ultra high frequency (UHF) follow-on.

The Ultra High Frequency (UHF) Follow-On satellite system provides Global Broadcast Services (GBS). GBS is a satellite-based broadcast system that allows for the dissemination of large amounts of data to a wide audience. The UHF Follow-On satellites operate in the UHF frequency range and are used by the U.S. Department of Defense for various communication purposes, including GBS.

Explanation

The Ultra High Frequency (UHF) Follow-On satellite system provides Global Broadcast Services (GBS). GBS is a satellite-based broadcast system that allows for the dissemination of large amounts of data to a wide audience. The UHF Follow-On satellites operate in the UHF frequency range and are used by the U.S. Department of Defense for various communication purposes, including GBS.

95. (430) What office resolves conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC)?

Joint Staff.

Combatant commander (COCOM).

Defense Information Systems Agency Operations Control Complex (DOCC).

Consolidated space operations center.

The Joint Staff is the correct answer because it is the office that resolves conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC). The Joint Staff is responsible for coordinating and integrating military activities across all branches of the armed forces, and it serves as the primary military advisory body to the President and the Secretary of Defense.

Explanation

The Joint Staff is the correct answer because it is the office that resolves conflicts regarding Defense Satellite Communications System (DSCS) ground mobile forces (GMF) satellite resources that cannot be settled by the Defense Information Systems Agency (DISA) and the regional satellite communications support center (RSSC). The Joint Staff is responsible for coordinating and integrating military activities across all branches of the armed forces, and it serves as the primary military advisory body to the President and the Secretary of Defense.

96. (402) In the Tropo/Satellite Support Radio frequency assembly, what permits the transmitter and receiver to be connected to the same antenna?

Circulator.

Combiner.

Coupler.

Hybrid.

A circulator is a device that allows signals to travel in only one direction in a circuit. In the Tropo/Satellite Support Radio frequency assembly, the circulator permits the transmitter and receiver to be connected to the same antenna by directing the signals from the transmitter to the antenna and the signals from the antenna to the receiver. This ensures that the transmitter and receiver do not interfere with each other and allows for efficient use of the antenna.

Explanation

A circulator is a device that allows signals to travel in only one direction in a circuit. In the Tropo/Satellite Support Radio frequency assembly, the circulator permits the transmitter and receiver to be connected to the same antenna by directing the signals from the transmitter to the antenna and the signals from the antenna to the receiver. This ensures that the transmitter and receiver do not interfere with each other and allows for efficient use of the antenna.

97. (417) What information is used for satellite tracking on an AN/GSC-52 earth terminal operating in the memory track mode?

Beacon signal.

Recorded data.

Ephemerous data.

Communications signal.

The AN/GSC-52 earth terminal uses recorded data for satellite tracking in the memory track mode. This means that the terminal stores and retrieves information from its memory to track the satellite's position and movement. This recorded data is crucial for accurately tracking and communicating with the satellite.

Explanation

The AN/GSC-52 earth terminal uses recorded data for satellite tracking in the memory track mode. This means that the terminal stores and retrieves information from its memory to track the satellite's position and movement. This recorded data is crucial for accurately tracking and communicating with the satellite.

98. (420) In the satellite readout station, the transmit/receive set

Transmits weather imagery to the satellite and receives telemetry data from the satellite on a 2.2 to 2.3 gigahertz bandwidth.

Receives and processes downlink satellite signals, and generates and tramsits uplink satellite commanding and ranging signals.

Monitors precise range measurements from the satellite vehicle and recovers almanac data from transmitted signals to measure signal quality.

Receives and processes the transmit signal for the satellite, and generates and receives downlink satellite commanding and ranging signals.

The correct answer is "receives and processes downlink satellite signals, and generates and transmits uplink satellite commanding and ranging signals." This answer accurately describes the function of the transmit/receive set in the satellite readout station. It states that the set receives and processes signals sent from the satellite (downlink signals), and also generates and transmits signals to the satellite (uplink signals) for commanding and ranging purposes.

Explanation

The correct answer is "receives and processes downlink satellite signals, and generates and transmits uplink satellite commanding and ranging signals." This answer accurately describes the function of the transmit/receive set in the satellite readout station. It states that the set receives and processes signals sent from the satellite (downlink signals), and also generates and transmits signals to the satellite (uplink signals) for commanding and ranging purposes.

99. (422) The Milstar Air Force terminal segment has terminals that are classified as either

Ship or shore.

Master or slave.

Airborne or ground.

Command post or force element.

The Milstar Air Force terminal segment consists of terminals that are classified as either command post or force element. This classification is based on the specific functions and roles these terminals perform within the Milstar system. The command post terminals are responsible for commanding and controlling the Milstar system, while the force element terminals are used by operational units to access and utilize the Milstar system's capabilities.

Explanation

The Milstar Air Force terminal segment consists of terminals that are classified as either command post or force element. This classification is based on the specific functions and roles these terminals perform within the Milstar system. The command post terminals are responsible for commanding and controlling the Milstar system, while the force element terminals are used by operational units to access and utilize the Milstar system's capabilities.

100. (433) Larger nodes, like the Promina 800, require which type of module to store important system code, network configurations, event logs, and network management data?

Promina logic module.

Promina server module.

Promina processor module (PPM).

Switching exchange module type II (SX-2).

Larger nodes like the Promina 800 require a Promina server module to store important system code, network configurations, event logs, and network management data. This module is specifically designed for this purpose and is capable of handling the storage requirements of the larger Promina nodes. The Promina server module is essential for efficient functioning and management of the network.

Explanation

Larger nodes like the Promina 800 require a Promina server module to store important system code, network configurations, event logs, and network management data. This module is specifically designed for this purpose and is capable of handling the storage requirements of the larger Promina nodes. The Promina server module is essential for efficient functioning and management of the network.

101. (417) Which of the following component is not used to control the AN/GSC-52 earth terminal?

Remote terminal processor (RTP).

External control element.

Internal control element.

Terminal processor (TP).

The AN/GSC-52 earth terminal is controlled by various components, including the remote terminal processor (RTP), external control element, and terminal processor (TP). However, the internal control element is not used to control the AN/GSC-52 earth terminal.

Explanation

The AN/GSC-52 earth terminal is controlled by various components, including the remote terminal processor (RTP), external control element, and terminal processor (TP). However, the internal control element is not used to control the AN/GSC-52 earth terminal.

102. (402) What is the intermediate frequency of the Tropo/Satellite Support Radio?

70 MHz with a 10 MHz bandpass.

70 MHz with a 20 MHz bandpass.

700 MHz with a 10 MHz bandpass.

700 MHz with a 20 MHz bandpass.

The intermediate frequency of the Tropo/Satellite Support Radio is 70 MHz with a 20 MHz bandpass. This means that the radio receives signals at a frequency of 70 MHz and filters out unwanted frequencies using a bandpass filter with a width of 20 MHz. This allows the radio to focus on the desired signals and improve the overall performance and reception.

Explanation

The intermediate frequency of the Tropo/Satellite Support Radio is 70 MHz with a 20 MHz bandpass. This means that the radio receives signals at a frequency of 70 MHz and filters out unwanted frequencies using a bandpass filter with a width of 20 MHz. This allows the radio to focus on the desired signals and improve the overall performance and reception.

103. (422) What is the maximum number of demand assigned multiple access (DAMA) networks can a single Milstar satellite support?

One.

Two.

Three.

Four.

A single Milstar satellite can support a maximum of three demand assigned multiple access (DAMA) networks. This means that the satellite can provide communication services for up to three separate networks simultaneously.

Explanation

A single Milstar satellite can support a maximum of three demand assigned multiple access (DAMA) networks. This means that the satellite can provide communication services for up to three separate networks simultaneously.

104. (423) What agency provides personnel at the regional satellite communications (Regional SATCOM) support center with resource allocation parameters?

Commander of the United States Strategic Command.

Defense Information Systems Agency (DISA).

Chairman of the Joint Chiefs of Staff (CJCS).

Defense Information Systems Agency Operations Control Complex (DOCC).

The Defense Information Systems Agency (DISA) provides personnel at the regional satellite communications (Regional SATCOM) support center with resource allocation parameters. DISA is responsible for managing and providing information technology and communications support to the Department of Defense (DoD) and other government agencies. As part of its role, DISA sets guidelines and parameters for resource allocation in order to ensure efficient and effective satellite communications operations at the regional level.

Explanation

The Defense Information Systems Agency (DISA) provides personnel at the regional satellite communications (Regional SATCOM) support center with resource allocation parameters. DISA is responsible for managing and providing information technology and communications support to the Department of Defense (DoD) and other government agencies. As part of its role, DISA sets guidelines and parameters for resource allocation in order to ensure efficient and effective satellite communications operations at the regional level.

105. (413) What comprises a telemetry data stream?

Mission data and mission satellite health and status data.

Command data and mission satellite health and status data.

Mission data, satellite ephemeris, table, and satellite status data.

Command data, satellite ephemeris table, and satellite status data.

A telemetry data stream comprises mission data and mission satellite health and status data. This means that the stream includes information related to the mission objectives as well as the health and status of the satellite being used for the mission. This data is crucial for monitoring and analyzing the performance of the satellite and ensuring the success of the mission.

Explanation

A telemetry data stream comprises mission data and mission satellite health and status data. This means that the stream includes information related to the mission objectives as well as the health and status of the satellite being used for the mission. This data is crucial for monitoring and analyzing the performance of the satellite and ensuring the success of the mission.

106. (414) What type of command is sent to the satellite by the space systems mission control complex and contains embedded timing that specifies the time the satellite will execute the command?

Real-time.

Time-delayed.

Timed program.

Stored program.

A stored program is a type of command sent to the satellite by the space systems mission control complex. This command contains embedded timing that specifies the time the satellite will execute the command. This means that the command is stored in the satellite's memory and executed at a specific predetermined time.

Explanation

A stored program is a type of command sent to the satellite by the space systems mission control complex. This command contains embedded timing that specifies the time the satellite will execute the command. This means that the command is stored in the satellite's memory and executed at a specific predetermined time.

107. (421) Which global positioning system operation control segment component is remotely operated and transmits and receives telemetry to and from the satellites?

Monitor station.

Ground antenna.

Master control station.

Transmit ground station.

The ground antenna is the component of the global positioning system operation control segment that is remotely operated and is responsible for transmitting and receiving telemetry to and from the satellites. It is used to establish communication with the satellites and gather data from them, making it an essential part of the control segment. The monitor station is responsible for monitoring the overall system performance, the master control station is responsible for managing and controlling the satellites, and the transmit ground station is responsible for transmitting signals to the satellites.

Explanation

The ground antenna is the component of the global positioning system operation control segment that is remotely operated and is responsible for transmitting and receiving telemetry to and from the satellites. It is used to establish communication with the satellites and gather data from them, making it an essential part of the control segment. The monitor station is responsible for monitoring the overall system performance, the master control station is responsible for managing and controlling the satellites, and the transmit ground station is responsible for transmitting signals to the satellites.

108. (421) Which is not a characteristic of the Defense Advanced Global Positioning System (GPS) Receiver?

Can only be used as a handheld unit.

Can process the GPS satellite triple frequency signals.

Can use an external power source and external antenna.

Can be installed in a host platform (ground facility, air, sea or land vehicle).

The Defense Advanced Global Positioning System (GPS) Receiver can process the GPS satellite triple frequency signals. This means that it is capable of receiving and interpreting signals from the GPS satellites that are transmitted on three different frequencies. This allows for more accurate positioning and navigation. The other characteristics mentioned in the options, such as being able to be used as a handheld unit, using an external power source and antenna, and being installable in different platforms, are all true for the Defense Advanced GPS Receiver.

Explanation

The Defense Advanced Global Positioning System (GPS) Receiver can process the GPS satellite triple frequency signals. This means that it is capable of receiving and interpreting signals from the GPS satellites that are transmitted on three different frequencies. This allows for more accurate positioning and navigation. The other characteristics mentioned in the options, such as being able to be used as a handheld unit, using an external power source and antenna, and being installable in different platforms, are all true for the Defense Advanced GPS Receiver.

109. (421) The purpose of the global positioning system ground antenna is to

Interface between the master control station and user sets.

Interface between the master control station and the satellites.

Provide all commanding and resources to process the satellite telemetry.

Provide all tracking and resources to process the monitor station downlinked telemetry.

The purpose of the global positioning system ground antenna is to interface between the master control station and the satellites. This means that the antenna acts as a communication link between the control station on Earth and the satellites in space. The antenna receives signals from the control station and transmits them to the satellites, and vice versa. This allows the control station to send commands and receive telemetry data from the satellites, enabling the system to function properly.

Explanation

The purpose of the global positioning system ground antenna is to interface between the master control station and the satellites. This means that the antenna acts as a communication link between the control station on Earth and the satellites in space. The antenna receives signals from the control station and transmits them to the satellites, and vice versa. This allows the control station to send commands and receive telemetry data from the satellites, enabling the system to function properly.

110. (415) The two major subdivisions of the Defense Meteorological Satellite Program user segment are

Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals.

Air Force Weather Agency and Fleet Numerical Meteorology Oceanography Center only.

Air Force Weather Agency and National Oceanographic Atmospheric Administration.

Fleet Numberical Meteorology Oceanography Center and National Oceanographic Atmospheric Administration and tactical terminals.

The correct answer is Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals. This answer accurately identifies the two major subdivisions of the Defense Meteorological Satellite Program user segment. The Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center are both responsible for providing weather and oceanographic information to support military operations. Additionally, tactical terminals are included as part of the user segment to facilitate the dissemination of this information to users in the field.

Explanation

The correct answer is Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center and tactical terminals. This answer accurately identifies the two major subdivisions of the Defense Meteorological Satellite Program user segment. The Air Force Weather Agency and the Fleet Numerical Meteorology Oceanography Center are both responsible for providing weather and oceanographic information to support military operations. Additionally, tactical terminals are included as part of the user segment to facilitate the dissemination of this information to users in the field.

111. (422) How many active satellites does the completed Milstar phase II (Milstar II) constellation consist of?

Three.

Four.

Six.

Eight.

The completed Milstar phase II (Milstar II) constellation consists of three active satellites.

Explanation

The completed Milstar phase II (Milstar II) constellation consists of three active satellites.

112. (433) Which module provides the processor platform, clock, and switching matrix for the Promina 200 and 400?

Promina logic module.

Promina server module.

Promina processor module.

Switching exchange module type II.

The Promina logic module is responsible for providing the processor platform, clock, and switching matrix for the Promina 200 and 400. This module is designed to handle the processing and routing of data within the Promina system, ensuring efficient communication between different network elements. It plays a crucial role in the overall functionality and performance of the Promina 200 and 400 systems.

Explanation

The Promina logic module is responsible for providing the processor platform, clock, and switching matrix for the Promina 200 and 400. This module is designed to handle the processing and routing of data within the Promina system, ensuring efficient communication between different network elements. It plays a crucial role in the overall functionality and performance of the Promina 200 and 400 systems.

113. (422) The Milstar extremelyhigh frequency (EHF)/ultrahigh frequency (UHF) fixed ground command post terminal has a

90-inch antenna and a radome.

96-inch antenna and a radome.

90-inch antenna and no radome.

96-inch antenna and no radome.

The Milstar extremely high frequency (EHF)/ultrahigh frequency (UHF) fixed ground command post terminal is equipped with a 90-inch antenna and a radome. This means that the terminal has a large antenna measuring 90 inches in size, which is used for sending and receiving signals in the EHF/UHF frequency range. The radome is a protective cover that is placed over the antenna to shield it from environmental elements such as rain, wind, and debris. Therefore, the correct answer is 90-inch antenna and a radome.

Explanation

The Milstar extremely high frequency (EHF)/ultrahigh frequency (UHF) fixed ground command post terminal is equipped with a 90-inch antenna and a radome. This means that the terminal has a large antenna measuring 90 inches in size, which is used for sending and receiving signals in the EHF/UHF frequency range. The radome is a protective cover that is placed over the antenna to shield it from environmental elements such as rain, wind, and debris. Therefore, the correct answer is 90-inch antenna and a radome.

114. (401) Which unit in the AN/TRC-170 terminal contains the rubidium standard?

Electrical frequency synthesizer.

Frequency subsystem unit.

Tropospheric scatter modem.

Transmitter-amplifier converter.

The rubidium standard is contained in the electrical frequency synthesizer unit of the AN/TRC-170 terminal. The electrical frequency synthesizer is responsible for generating precise and stable frequencies for the terminal's operations.

Explanation

The rubidium standard is contained in the electrical frequency synthesizer unit of the AN/TRC-170 terminal. The electrical frequency synthesizer is responsible for generating precise and stable frequencies for the terminal's operations.

115. (414) The function of the command and control (C2) segment of the space systems is to

Provide downlink informatino and recover the payload and health and status data.

Maintain the satellite health and status and recover the payload and health and status data.

Provide downlink information and recover the payload and the area of coverage require by the program mission.

Maintain the satellite health and status and recover the payload and the area of coverage required by the program mission.

The function of the command and control (C2) segment of the space systems is to maintain the satellite health and status and recover the payload and health and status data. This means that the C2 segment is responsible for monitoring and managing the overall health and status of the satellite, as well as retrieving important data regarding the payload and its health and status. It is crucial for the C2 segment to ensure that the satellite is functioning properly and to collect necessary information for analysis and decision-making purposes.

Explanation

The function of the command and control (C2) segment of the space systems is to maintain the satellite health and status and recover the payload and health and status data. This means that the C2 segment is responsible for monitoring and managing the overall health and status of the satellite, as well as retrieving important data regarding the payload and its health and status. It is crucial for the C2 segment to ensure that the satellite is functioning properly and to collect necessary information for analysis and decision-making purposes.

116. (418) In the AN/GSC-52 earth terminal's control, monitor, and alarm group (CMA), what equipment interfaces to separate individual subsystems and is responsible for control and status of specific groups of terminal equipment?

Station console.

Terminal servers.

Terminal processor (TP).

External control element (ECE).

Terminal servers interface with separate individual subsystems in the AN/GSC-52 earth terminal's control, monitor, and alarm group (CMA). They are responsible for controlling and monitoring specific groups of terminal equipment. The station console is a control interface, but it does not specifically handle control and status of terminal equipment groups. The terminal processor (TP) is responsible for overall control and coordination, not specific groups. The external control element (ECE) is not mentioned in the question, so it cannot be determined if it is responsible for control and status of specific groups of terminal equipment.

Explanation

Terminal servers interface with separate individual subsystems in the AN/GSC-52 earth terminal's control, monitor, and alarm group (CMA). They are responsible for controlling and monitoring specific groups of terminal equipment. The station console is a control interface, but it does not specifically handle control and status of terminal equipment groups. The terminal processor (TP) is responsible for overall control and coordination, not specific groups. The external control element (ECE) is not mentioned in the question, so it cannot be determined if it is responsible for control and status of specific groups of terminal equipment.

117. (423) The purpose of the Defense Information Systems Agency Operations Control Complex (DOCC is to

Provide operational control of the Defense Communications System (DCS).

Provide operational control of the Air Force satellite communications (AFSATCOM) system.

Manage and provide the regional satellite communications support center (RSSC) with satellite engineering parameters.

Manage and distribute bandwidths allocated from the Chairman Joint Chiefs of Staff (CJCS) for their respective theaters of responsibility.

The purpose of the Defense Information Systems Agency Operations Control Complex (DOCC) is to provide operational control of the Defense Communications System (DCS). This means that the DOCC is responsible for managing and overseeing the operations of the DCS, ensuring its functionality and effectiveness in supporting the communication needs of the defense establishment. The DOCC would be responsible for monitoring and controlling the DCS network, managing its resources, and coordinating its activities to ensure seamless and secure communication within the defense organization.

Explanation

The purpose of the Defense Information Systems Agency Operations Control Complex (DOCC) is to provide operational control of the Defense Communications System (DCS). This means that the DOCC is responsible for managing and overseeing the operations of the DCS, ensuring its functionality and effectiveness in supporting the communication needs of the defense establishment. The DOCC would be responsible for monitoring and controlling the DCS network, managing its resources, and coordinating its activities to ensure seamless and secure communication within the defense organization.

118. (415) What is the purpose of the space system user segment?

Receive, process, use, or distribute mission data as required by a program's taskings.

Receive, process, use, or distribute payload data and provide essential space support tasks as required by a program's tasking.

Transmit, process, use, or distribute mission data as required by a program's tasking.

Transmit, process, use, or distribute payload data and provide essential space support tasks as required by a program's tasking.

The purpose of the space system user segment is to receive, process, use, or distribute mission data as required by a program's taskings. This means that the user segment is responsible for handling the data related to the mission objectives and making it available to the relevant parties. This could involve receiving data from various sources, processing it to extract meaningful information, using it for decision-making or analysis, and distributing it to other segments or users as needed. The user segment plays a crucial role in ensuring that the mission data is effectively utilized to achieve the program's goals.

Explanation

The purpose of the space system user segment is to receive, process, use, or distribute mission data as required by a program's taskings. This means that the user segment is responsible for handling the data related to the mission objectives and making it available to the relevant parties. This could involve receiving data from various sources, processing it to extract meaningful information, using it for decision-making or analysis, and distributing it to other segments or users as needed. The user segment plays a crucial role in ensuring that the mission data is effectively utilized to achieve the program's goals.

119. (430) The regional satellite communications support center (RSSC) is a

Network control center for links ending in the center's area of responsibility.

Network operations center for links ending in the center's area of responsibility.

Planning cell that supports unified and specified commands with ground mobile forces access on the DSCS.

The regional satellite communications support center (RSSC) is a planning cell that supports unified and specified commands with ground mobile forces access on the Defense Satellite Communications System (DSCS). This means that the RSSC is responsible for coordinating and planning the use of the DSCS for unified and specified commands, providing ground mobile forces access to the satellite communications system. It does not function as a network control center or network operations center, but rather focuses on planning and supporting communication operations for specific commands.

Explanation

The regional satellite communications support center (RSSC) is a planning cell that supports unified and specified commands with ground mobile forces access on the Defense Satellite Communications System (DSCS). This means that the RSSC is responsible for coordinating and planning the use of the DSCS for unified and specified commands, providing ground mobile forces access to the satellite communications system. It does not function as a network control center or network operations center, but rather focuses on planning and supporting communication operations for specific commands.

120. (423) What agency plans and executes satellite tracking and ephemeris data generation?

Commander of the United States Strategic Command.

Defense Information Systems Agency (DISA).

Chairman of the Joint Chiefs of Staff (CJCS).

Defense Information Systems Agency Operations Control Complex (DOCC).

The correct answer is Commander of the United States Strategic Command. The Commander of the United States Strategic Command is responsible for planning and executing satellite tracking and ephemeris data generation. This agency is in charge of monitoring and tracking satellites in space, as well as generating accurate data on their positions and movements. They play a crucial role in ensuring the effective use of satellites for various purposes, including communication, navigation, and intelligence gathering.

Explanation

The correct answer is Commander of the United States Strategic Command. The Commander of the United States Strategic Command is responsible for planning and executing satellite tracking and ephemeris data generation. This agency is in charge of monitoring and tracking satellites in space, as well as generating accurate data on their positions and movements. They play a crucial role in ensuring the effective use of satellites for various purposes, including communication, navigation, and intelligence gathering.

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