Which of the following digital modes is designed for meteor scatter communications?

  1. WSPR
  2. MSK144
  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 special digital modes
  3. Short transmissions with rapidly repeated call signs and signal reports
  4. All these choices are correct


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

  1. MSK144
  3. Olivia
  4. JT65


What technology is used to track, in real time, balloons carrying amateur radio transmitters?

  1. Ultrasonics
  2. Bandwidth compressed LORAN
  3. APRS
  4. Doppler shift of beacon signals


What is one advantage of the JT65 mode?

  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


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


What type of modulation is used for JT65 contacts?

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


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 Global Positioning System unit can automatically transmit information to show a mobile station's position during the event
  4. All these choices are correct


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

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