E2D: VHF and UHF digital modes; packet clusters; Automatic Position Reporting System (APRS)
E2D01:
What does “command mode” mean in packet operations?
The TNC is ready to receive instructions via the keyboard
Your computer is ready to run packet communications software
Your TNC has received a command packet from a remote TNC
The computer is ready to be set up to communicate with the TNC
E2D02:
What is the definition of “baud”?
The number of data symbols transmitted per second
The number of characters transmitted per second
The number of characters transmitted per minute
The number of words transmitted per minute
E2D03:
Which of the follow is true when comparing HF and 2-meter packet operations?
HF packet typically uses FSK with a data rate of 300 baud; 2-meter packet uses AFSK with a data rate of 1200 baud
HF packet and 2-meter packet operations use different codes for information exchange
HF packet is limited to Amateur Extra class amateur licensees; 2-meter packet is open to all but Novice Class amateur licensees
HF and 2-meter packet operations are both limited to CW/Data-only band segments
E2D04:
What is the purpose of digital store-and-forward functions on an Amateur satellite?
To store digital messages in the satellite for later download by other stations
To upload operational software for the transponder
To delay download of telemetry until the satellite is over the control station
To relay messages between satellites
E2D05:
Which of the following techniques is normally used by low-earth orbiting digital satellites to relay messages around the world?
Store-and-forward
Digipeating
Multi-satellite relaying
Node hopping
E2D06:
Which of the following is a commonly used 2-meter APRS frequency?
144.39 MHz
144.20 MHz
145.02 MHz
146.52 MHz
E2D07:
Which of the following digital protocols is used by APRS?
AX.25
802.11
PACTOR
AMTOR
E2D08:
Which of the following types of packet frames is used to transmit APRS beacon data?
Unnumbered Information frames
Connect frames
Disconnect frames
Acknowledgement frames
E2D09:
Under clear communications conditions, which of these digital communications modes has the fastest data throughput?
300-baud packet
AMTOR
170-Hz shift, 45 baud RTTY
PSK31
E2D10:
How can an APRS station be used to help support a public service communications activity?
An APRS station with a GPS unit can automatically transmit information to show a mobile station's position during the event
An APRS station with an emergency medical technician can automatically transmit medical data to the nearest hospital
APRS stations with General Personnel Scanners can automatically relay the participant numbers and time as they pass the check points
All of these choices are correct
E2D11:
Which of the following data sources are needed to accurately transmit your geographical location over the APRS network?
Any of these choices is correct
The NMEA-0183 formatted data from a Global Positioning System (GPS) satellite receiver
The latitude and longitude of your location, preferably in degrees, minutes and seconds, entered into the APRS computer software
The NMEA-0183 formatted data from a LORAN navigation system
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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