Z3D153 Vol3 Unit 2

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Multichannel Satellite Principles.


Questions and Answers
  • 1. 

    What is multiplexing? 

    • A.

      Transmitting one signal over multiple transmission paths.

    • B.

      Transmitting one signal multiple times over a single transmission path.

    • C.

      Combining multiple information channels onto a common transmission medium.

    • D.

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

    Correct Answer
    C. Combining multiple information channels onto a common transmission medium.
    Explanation
    Multiplexing refers to the process of combining multiple information channels onto a common transmission medium. This allows for more efficient use of the transmission medium by sharing it among multiple signals. By multiplexing, different signals can be transmitted simultaneously, which increases the overall capacity and utilization of the transmission medium. This technique is commonly used in telecommunications and networking to optimize the use of available resources.

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  • 2. 

    What specifically does wavelength division multiplexing assign each incoming optical signal?

    • A.

      Pseudorandom code.

    • B.

      Frequency of light.

    • C.

      Radio frequency.

    • D.

      Time slot.

    Correct Answer
    B. Frequency of light.
    Explanation
    Wavelength division multiplexing assigns each incoming optical signal a specific frequency of light. This technique allows multiple signals to be transmitted simultaneously over a single optical fiber by assigning each signal a different wavelength. The signals can then be separated and demultiplexed at the receiving end based on their respective frequencies. This enables efficient and high-capacity communication by utilizing different wavelengths to carry different data streams.

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  • 3. 

    Which multiplexing division technique samples each low speed channel in sequence to interleave bits or characters and then transmit them at high speed?

    • A.

      Wavelength.

    • B.

      Frequency.

    • C.

      Code.

    • D.

      Time.

    Correct Answer
    D. Time.
    Explanation
    The correct answer is time. Time division multiplexing (TDM) is a technique where each low-speed channel is sampled in sequence, and the bits or characters are interleaved and transmitted at a high speed. This allows multiple channels to share the same transmission medium by taking turns using it for a specific amount of time.

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  • 4. 

    Which of the following relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm?

    • A.

      Controlled diphase.

    • B.

      Non-return to zero.

    • C.

      Forward error correction.

    • D.

      Quadrature phase shift keying (QPSK).

    Correct Answer
    C. Forward error correction.
    Explanation
    Forward error correction is a technique that relies on the transmitter to send multiple copies of the same message to the distant end using a predetermined algorithm. This algorithm allows the receiver to detect and correct errors in the received data by comparing the multiple copies of the message. This ensures that the transmitted data is received accurately, even if there are errors introduced during the transmission process. Controlled diphase, non-return to zero, and quadrature phase shift keying (QPSK) are not specifically designed to send multiple copies of the same message using a predetermined algorithm.

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  • 5. 

    Which SATCOM system module is used to produce the final transmit frequency?

    • A.

      Up converter.

    • B.

      Modulator.

    • C.

      Amplifier.

    • D.

      Antenna.

    Correct Answer
    A. Up converter.
    Explanation
    The up converter is used in the SATCOM system module to produce the final transmit frequency. It takes the baseband signal and converts it to a higher frequency that can be transmitted through the antenna. The up converter is responsible for shifting the frequency of the signal to the desired transmit frequency, allowing it to be transmitted over the airwaves. This process is essential in satellite communication systems as it ensures that the transmitted signal is compatible with the receiving equipment.

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  • 6. 

    Which type of power amplifier uses semiconductor transistors designed for microwave and higher frequency RF operation?

    • A.

      Klystron.

    • B.

      Solid state.

    • C.

      Traveling wave tube amplifier.

    • D.

      Metal oxide field-effect transistor (MOSFET).

    Correct Answer
    B. Solid state.
    Explanation
    Solid state power amplifiers use semiconductor transistors designed for microwave and higher frequency RF operation. These amplifiers are more compact, efficient, and reliable compared to other types of power amplifiers. Klystron and traveling wave tube amplifiers are vacuum tube-based amplifiers that are typically used in high-power applications but are not specifically designed for microwave and higher frequency RF operation. Metal oxide field-effect transistors (MOSFETs) are also semiconductor devices but are not specifically designed for microwave and higher frequency RF operation.

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  • 7. 

    Which module is the first step of the receive signal path?

    • A.

      Low noise amplifier.

    • B.

      Down converter.

    • C.

      Up converter.

    • D.

      Demodulator.

    Correct Answer
    A. Low noise amplifier.
    Explanation
    The first step in the receive signal path is the low noise amplifier. This module is responsible for amplifying the weak incoming signal while introducing as little noise as possible. By amplifying the signal at an early stage, it helps to improve the overall signal-to-noise ratio and enhance the performance of the subsequent modules in the receive chain. The low noise amplifier is crucial in maintaining the integrity of the received signal and ensuring optimal signal quality throughout the system.

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  • 8. 

    Which module strips away the intelligence from the Intermediate frequency?

    • A.

      Low noise amplifier.

    • B.

      Down converter.

    • C.

      Up converter.

    • D.

      Demodulator.

    Correct Answer
    D. Demodulator.
    Explanation
    The demodulator is responsible for extracting the original intelligence or information from the intermediate frequency signal. It removes the modulation that was applied to the carrier wave during transmission, allowing the original signal to be retrieved. In contrast, the low noise amplifier amplifies the weak incoming signal, the down converter converts the high-frequency signal to a lower intermediate frequency, and the up converter converts the intermediate frequency back to a higher frequency for transmission.

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  • 9. 

    When establishing a communication link with a satellite the required sequence of events is?

    • A.

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

    • B.

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

    • C.

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

    • D.

      Orbit prediction, space acquisition, and frequency acquisition

    Correct Answer
    C. Orbit prediction, antenna pointing, satellite acquisition, and satellite tracking.
    Explanation
    When establishing a communication link with a satellite, the first step is to predict the orbit of the satellite. This is important to determine its location and trajectory. Once the orbit is predicted, the next step is to point the antenna towards the satellite. This ensures that the signal is directed towards the right location. After antenna pointing, the satellite acquisition takes place, where the satellite is identified and locked onto. Finally, satellite tracking is performed to continuously monitor and adjust the communication with the satellite as it moves through its orbit.

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  • 10. 

    Which tracking method requires no input from a satellite?

    • A.

      Programmed track.

    • B.

      Automatic track.

    • C.

      Pseudoconscan.

    • D.

      Step track.

    Correct Answer
    A. Programmed track.
    Explanation
    The correct answer is Programmed track. Programmed track is a tracking method that does not require any input from a satellite. It is a pre-determined track that is programmed into a tracking system, and the system follows this track without the need for satellite assistance. This method is often used in situations where satellite communication is not available or not feasible. Automatic track, Pseudoconscan, and Step track all require some form of satellite input for tracking purposes.

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  • 11. 

    What signal originating from the satellite do we use to acquire and track the satellite?

    • A.

      Beacon.

    • B.

      Telemetry.

    • C.

      Ephemeris.

    • D.

      Communication.

    Correct Answer
    A. Beacon.
    Explanation
    The signal used to acquire and track the satellite is called the beacon. The beacon signal is emitted by the satellite and is received by ground stations. It provides essential information about the satellite's location and status, allowing for accurate tracking and communication. Telemetry refers to the data transmitted by the satellite about its performance and health. Ephemeris is the information about the satellite's predicted orbit. Communication refers to the exchange of data and information between the satellite and ground stations.

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