Topic T8D Quick Review Audio


Which of the following is a digital communications mode?

  1. Packet radio
  2. IEEE 802.11
  3. JT65
  4. All of these choices are correct


What does the term "APRS" mean?

  1. Automatic Packet Reporting System
  2. Associated Public Radio Station
  3. Auto Planning Radio Set-up
  4. Advanced Polar Radio System


Which of the following devices is used to provide data to the transmitter when sending automatic position reports from a mobile amateur radio station?

  1. The vehicle speedometer
  2. A WWV receiver
  3. A connection to a broadcast FM sub-carrier receiver
  4. A Global Positioning System receiver


What type of transmission is indicated by the term "NTSC?"

  1. A Normal Transmission mode in Static Circuit
  2. A special mode for earth satellite uplink
  3. An analog fast scan color TV signal
  4. A frame compression scheme for TV signals


Which of the following is an application of APRS (Automatic Packet Reporting System)?

  1. Providing real-time tactical digital communications in conjunction with a map showing the locations of stations
  2. Showing automatically the number of packets transmitted via PACTOR during a specific time interval
  3. Providing voice over internet connection between repeaters
  4. Providing information on the number of stations signed into a repeater


What does the abbreviation "PSK" mean?

  1. Pulse Shift Keying
  2. Phase Shift Keying
  3. Packet Short Keying
  4. Phased Slide Keying


Which of the following best describes DMR (Digital Mobile Radio)?

  1. A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
  2. An automatic position tracking mode for FM mobiles communicating through repeaters
  3. An automatic computer logging technique for hands-off logging when communicating while operating a vehicle
  4. A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction


Which of the following may be included in packet transmissions?

  1. A check sum that permits error detection
  2. A header that contains the call sign of the station to which the information is being sent
  3. Automatic repeat request in case of error
  4. All of these choices are correct


What code is used when sending CW in the amateur bands?

  1. Baudot
  2. Hamming
  3. International Morse
  4. All of these choices are correct


Which of the following operating activities is supported by digital mode software in the WSJT suite?

  1. Moonbounce or Earth-Moon-Earth
  2. Weak-signal propagation beacons
  3. Meteor scatter
  4. All of these choices are correct


What is an ARQ transmission system?

  1. A special transmission format limited to video signals
  2. A system used to encrypt command signals to an amateur radio satellite
  3. A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information
  4. A method of compressing the data in a message so more information can be sent in a shorter time


Which of the following best describes Broadband-Hamnet (TM), also referred to as a high-speed multi-media network?

  1. An amateur-radio-based data network using commercial Wi-Fi gear with modified firmware
  2. A wide-bandwidth digital voice mode employing DRM protocols
  3. A satellite communications network using modified commercial satellite TV hardware
  4. An internet linking protocol used to network repeaters


What is FT8?

  1. A wideband FM voice mode
  2. A digital mode capable of operating in low signal-to-noise conditions that transmits on 15-second intervals
  3. An eight channel multiplex mode for FM repeaters
  4. A digital slow scan TV mode with forward error correction and automatic color compensation


What is an electronic keyer?

  1. A device for switching antennas from transmit to receive
  2. A device for voice activated switching from receive to transmit
  3. A device that assists in manual sending of Morse code
  4. An interlock to prevent unauthorized use of a radio