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Subel. T8
12 questions
Subelement T8

SIGNALS AND EMISSIONS

Section T8D

Non-voice and digital communications: image signals and definition of NTSC, CW, packet radio, PSK, APRS, error detection and correction, amateur radio networking, DMR, WSJT modes, Broadband-Hamnet

Which of the following is a digital communications mode?

  • Packet radio
  • IEEE 802.11
  • FT8
  • Correct Answer
    All these choices are correct
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What is FT8?

  • A wideband FM voice mode
  • Correct Answer
    A digital mode capable of low signal-to-noise operation
  • An eight-channel multiplex mode for FM repeaters
  • A digital slow-scan TV mode with forward error correction and automatic color compensation
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What kind of data can be transmitted by APRS?

  • GPS position data
  • Text messages
  • Weather data
  • Correct Answer
    All these choices are correct
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What is meant by the term "NTSC?"

  • A digital transmission standard for encrypting data
  • A special mode for satellite uplink
  • Correct Answer
    An analog fast-scan color TV signal
  • A frame compression scheme for TV signals
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Which of the following is an application of APRS?

  • Correct Answer
    Providing real-time tactical digital communications in conjunction with a map showing the locations of stations
  • Automatically showing the number of packets transmitted via PACTOR during a specific time interval
  • Providing voice over internet connection between repeaters
  • Providing information on the number of stations signed into a repeater
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What does the abbreviation "PSK" mean?

  • Pulse Shift Keying
  • Correct Answer
    Phase Shift Keying
  • Packet Sampled Keying
  • Power Sampled Keying
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Which of the following describes DMR?

  • Correct Answer
    A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
  • An automatic position tracking mode for FM mobiles communicating through repeaters
  • An automatic computer logging technique for hands-off logging when communicating while operating a vehicle
  • A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction
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Which of the following is included in packet radio transmissions?

  • A checksum that permits error detection
  • A header that contains the call sign of the station to which the information is being sent
  • Automatic repeat request in case of error
  • Correct Answer
    All these choices are correct
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What is CW?

  • A type of electromagnetic propagation
  • A digital mode used primarily on 2-meter FM
  • Error correction for digital transmission using code words
  • Correct Answer
    Another name for a Morse code transmission
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Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?

  • Earth-Moon-Earth
  • Weak signal propagation beacons
  • Meteor scatter
  • Correct Answer
    All these choices are correct
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What is the role of ARQ in a transmission system?

  • A special transmission format limited to video signals
  • A system used to encrypt command signals to an amateur radio satellite
  • Correct Answer
    An error correction method in which the receiving station detects errors and sends a request for retransmission
  • A method of compressing data using autonomous reiterative Q codes prior to final encoding
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Which of the following best describes an amateur radio mesh network?

  • Correct Answer
    An amateur-radio data network using commercial Wi-Fi equipment with modified firmware
  • A wide-bandwidth digital voice mode employing DMR protocols
  • An amateur-radio satellite communications network using modified commercial satellite TV hardware
  • An internet linking protocol allowing communication through repeaters around the world
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Go to T8C Go to T9A
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