Which of the following digital modes is especially designed for use for meteor scatter signals?

  1. WSPR
  2. FSK441
  3. Hellschreiber
  4. APRS


Which of the following is a good technique for making meteor scatter contacts?

  1. 15 second timed transmission sequences with stations alternating based on location
  2. Use of high speed CW or digital modes
  3. Short transmission with rapidly repeated call signs and signal reports
  4. All of these choices are correct


Which of the following digital modes is especially useful for EME communications?

  1. FSK441
  3. Olivia
  4. JT65


What is the purpose of digital store-and-forward functions on an Amateur Radio satellite?

  1. To upload operational software for the transponder
  2. To delay download of telemetry between satellites
  3. To store digital messages in the satellite for later download by other stations
  4. To relay messages between satellites


Which of the following techniques is normally used by low Earth orbiting digital satellites to relay messages around the world?

  1. Digipeating
  2. Store-and-forward
  3. Multi-satellite relaying
  4. Node hopping


Which of the following describes a method of establishing EME contacts?

  1. Time synchronous transmissions alternately from each station
  2. Storing and forwarding digital messages
  3. Judging optimum transmission times by monitoring beacons reflected from the Moon
  4. High speed CW identification to avoid fading


What digital protocol is used by APRS?

  2. 802.11
  3. AX.25
  4. AMTOR


What type of packet frame is used to transmit APRS beacon data?

  1. Unnumbered Information
  2. Disconnect
  3. Acknowledgement
  4. Connect


Which of these digital modes has the fastest data throughput under clear communication conditions?

  1. AMTOR
  2. 170 Hz shift, 45 baud RTTY
  3. PSK31
  4. 300 baud packet


How can an APRS station be used to help support a public service communications activity?

  1. An APRS station with an emergency medical technician can automatically transmit medical data to the nearest hospital
  2. APRS stations with General Personnel Scanners can automatically relay the participant numbers and time as they pass the check points
  3. An APRS station with a GPS unit can automatically transmit information to show a mobile station's position during the event
  4. All of these choices are correct


Which of the following data are used by the APRS network to communicate your location?

  1. Polar coordinates
  2. Time and frequency
  3. Radio direction finding spectrum analysis
  4. Latitude and longitude


How does JT65 improve EME communications?

  1. It can decode signals many dB below the noise floor using FEC
  2. It controls the receiver to track Doppler shift
  3. It supplies signals to guide the antenna to track the Moon
  4. All of these choices are correct


What type of modulation is used for JT65 contacts?

  1. Multi-tone AFSK
  2. PSK
  3. RTTY
  4. IEEE 802.11


What is one advantage of using JT65 coding?

  1. Uses only a 65 Hz bandwidth
  2. The ability to decode signals which have a very low signal to noise ratio
  3. Easily copied by ear if necessary
  4. Permits fast-scan TV transmissions over narrow bandwidth