3D1X3 CDC Volume 3 Ure

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  • 1/120 Questions

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

    • Amplitude modulation and pulse modulation.
    • Daylight saving.
    • 24-hour.
    • 12-hour.
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About This Quiz

This quiz assesses knowledge on the AN\/TRC-170 systems and related military communication protocols. It covers topics such as antenna diversity, system configurations, and encryption devices, crucial for professionals handling military communications and security.

Air Force Quizzes & Trivia

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  • 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.

    Correct Answer
    A. Synchronized timing.
    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.

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  • 3. 

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

    • Air.

    • Cryogenic.

    • Liquid nitrogen.

    • Ethanol/glycol solution.

    Correct Answer
    A. Air.
    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.

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  • 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.

    Correct Answer
    A. The apparent motion of the sun in the sky.
    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.

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  • 5. 

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

    • Broadband.

    • Wide angle.

    • High frequency.

    • Highly directional.

    Correct Answer
    A. Highly directional.
    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.

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  • 6. 

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

    • Active and passive.

    • Active and real-time.

    • Delay and passive.

    • Delay and real-time.

    Correct Answer
    A. 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.

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  • 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.

    Correct Answer
    A. Temperature and aging.
    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.

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  • 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.

    Correct Answer
    A. Combining multiple signals for transmission over a single transmission path.
    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.

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  • 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).

    Correct Answer
    A. T-1 (1.544 Mbps).
    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.

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  • 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.

    Correct Answer
    A. Mu-Law.
    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.

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  • 11. 

    (404)  Which satellite reflects signals transmitted toward it?

    • Active.

    • Delay.

    • Passive.

    • Real-time.

    Correct Answer
    A. Passive.
    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.

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  • 12. 

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

    • Pendulum.

    • Crystal.

    • Quartz.

    • Cesium.

    Correct Answer
    A. Cesium.
    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.

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  • 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.

    Correct Answer
    A. Atoms release energy at a particular resonant frequency.
    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.

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  • 14. 

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

    • Voice.

    • Cable.

    • Radio.

    • Wireless.

    Correct Answer
    A. Cable.
    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.

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  • 15. 

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

    • Beacon.

    • Ephemeris.

    • Telemetry.

    • Communication.

    Correct Answer
    A. Beacon.
    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.

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  • 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.

    Correct Answer
    A. Transcoding.
    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.

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  • 17. 

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

    • Apogee.

    • Perigee.

    • Major axis.

    • Minor axis.

    Correct Answer
    A. 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.

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  • 18. 

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

    • 0 degrees.

    • 45 degrees.

    • 90 degrees.

    • 180 degrees

    Correct Answer
    A. 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.

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  • 19. 

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

    • Degrees.

    • Seconds.

    • Minutes.

    • Nautical miles.

    Correct Answer
    A. Degrees.
    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.

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  • 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.

    Correct Answer
    A. Top Secret.
    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.

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  • 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.

    Correct Answer
    A. XTAR, LLC.
    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.

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  • 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.

    Correct Answer
    A. 25 miles.
    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.

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  • 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.

    Correct Answer
    A. +/- 4 MHz.
    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.

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  • 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).

    Correct Answer
    A. Demand assigned multiple access (DAMA).
    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.

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  • 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.

    Correct Answer
    A. International Bureau of Weights and Measures.
    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.

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  • 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.

    Correct Answer
    A. Four.
    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.

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  • 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.

    Correct Answer
    A. Logical slot.
    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.

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  • 28. 

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

    • 0.1 seconds.

    • 0.6 seconds.

    • 1.0 seconds.

    • 6.0 seconds.

    Correct Answer
    A. 0.6 seconds.
    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.

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  • 29. 

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

    • Pseudorandom code.

    • Frequency of light.

    • Radio frequency.

    • Time slot.

    Correct Answer
    A. 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.

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  • 30. 

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

    • Middle.

    • Center.

    • Upper.

    • Lower.

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

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  • 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).

    Correct Answer
    A. 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).

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  • 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.

    Correct Answer
    A. Predicted satellite orbit.
    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.

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  • 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.

    Correct Answer
    A. Spot beam.
    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.

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  • 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.

    Correct Answer
    A. Iridium Satellite, LLC.
    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.

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  • 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.

    Correct Answer
    A. Two 6-foot-diameter, linearly dual-polarized antennas.
    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.

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  • 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.

    Correct Answer
    A. Operate over a wider-frequency range.
    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.

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  • 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.

    Correct Answer
    A. Maintainer workstation.
    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.

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  • 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.

    Correct Answer
    A. Radio frequency set, transmit/receiver set, and digital equipment set.
    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.

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  • 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.

    Correct Answer
    A. It indicates the quality of the operating signal without interrupting the signal.
    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.

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  • 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.

    Correct Answer
    A. 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.

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  • 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.

    Correct Answer
    A. 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.

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  • 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.

    Correct Answer
    A. Servo amplifier.
    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.

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  • 43. 

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

    • Polarization.

    • Crossband.

    • Frequency.

    • Space.

    Correct Answer
    A. Polarization.
    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.

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  • 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.

    Correct Answer
    A. Milstar.
    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.

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  • 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.

    Correct Answer
    A. Four tracking feedhorns and one communication feedhorn.
    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.

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  • 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.

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

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  • 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.

    Correct Answer
    A. Tactical.
    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.

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  • 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.

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

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  • 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.

    Correct Answer
    A. Crosslinking.
    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.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 21, 2011
    Quiz Created by
    Ihatecdc
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