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

1. A WSPR
2. B MSK144
3. C Hellschreiber
4. D APRS

What information replaces signal-to-noise ratio when using the FT8 or FT4 modes in a VHF contest?

1. A RST report
2. B State abbreviation
3. C Serial number
4. D Grid square

Which of the following digital modes is designed for EME communications?

1. A MSK144
2. B PACTOR III
3. C WSPR
4. D Q65

What technology is used for real-time tracking of balloons carrying amateur radio transmitters?

1. A FT8
2. B Bandwidth compressed LORAN
3. C APRS
4. D PACTOR III

What is the characteristic of the JT65 mode?

1. A Uses only a 65 Hz bandwidth
2. B Decodes signals with a very low signal-to-noise ratio
3. C Symbol rate is 65 baud
4. D Permits fast-scan TV transmissions over narrow bandwidth

Which of the following is a method for establishing EME contacts?

1. A Time-synchronous transmissions alternating between stations
2. B Storing and forwarding digital messages
3. C Judging optimum transmission times by monitoring beacons reflected from the moon
4. D High-speed CW identification to avoid fading

What digital protocol is used by APRS?

1. A PACTOR
2. B QAM
3. C AX.25
4. D AMTOR

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

1. A Acknowledgement
2. B Burst
3. C Unnumbered Information
4. D Connect

What type of modulation is used by JT65?

1. A Multitone AFSK
2. B PSK
3. C RTTY
4. D QAM

What does the packet path WIDE3-1 designate?

1. A Three stations are allowed on frequency, one transmitting at a time
2. B Three subcarriers are permitted, subcarrier one is being used
3. C Three digipeater hops are requested with one remaining
4. D Three internet gateway stations may receive one transmission

How do APRS stations relay data?

1. A By packet ACK/NAK relay
2. B By C4FM repeaters
3. C By DMR repeaters
4. D By packet digipeaters