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HAM
Trainer
Readiness
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Checkpoint
Group T8D
12 questions from the official pool, drawn by ID — exact wording, never retyped.
T8D01
Which of the following is a digital communications mode?
A
Packet radio
B
IEEE 802.11
C
FT8
D
All these choices are correct
T8D02
What is FT8?
A
A wideband FM voice mode
B
A digital mode capable of low signal-to-noise operation
C
An eight-channel multiplex mode for FM repeaters
D
A digital slow-scan TV mode with forward error correction and automatic color compensation
T8D03
What kind of data can be transmitted by APRS?
A
GPS position data
B
Text messages
C
Weather data
D
All these choices are correct
T8D04
What is meant by the term "NTSC?"
A
A digital transmission standard for encrypting data
B
A special mode for satellite uplink
C
An analog fast-scan color TV signal
D
A frame compression scheme for TV signals
T8D05
Which of the following is an application of APRS?
A
Providing real-time tactical digital communications in conjunction with a map showing the locations of stations
B
Automatically showing the number of packets transmitted via PACTOR during a specific time interval
C
Providing voice over internet connection between repeaters
D
Providing information on the number of stations signed into a repeater
T8D06
What does the abbreviation "PSK" mean?
A
Pulse Shift Keying
B
Phase Shift Keying
C
Packet Sampled Keying
D
Power Sampled Keying
T8D07
Which of the following describes DMR?
A
A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
B
An automatic position tracking mode for FM mobiles communicating through repeaters
C
An automatic computer logging technique for hands-off logging when communicating while operating a vehicle
D
A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction
T8D08
Which of the following is included in packet radio transmissions?
A
A checksum that permits error detection
B
A header that contains the call sign of the station to which the information is being sent
C
Automatic repeat request in case of error
D
All these choices are correct
T8D09
What is CW?
A
A type of electromagnetic propagation
B
A digital mode used primarily on 2-meter FM
C
Error correction for digital transmission using code words
D
Another name for a Morse code transmission
T8D10
Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?
A
Earth-Moon-Earth
B
Weak signal propagation beacons
C
Meteor scatter
D
All these choices are correct
T8D11
What is the role of ARQ in a transmission system?
A
A special transmission format limited to video signals
B
A system used to encrypt command signals to an amateur radio satellite
C
An error correction method in which the receiving station detects errors and sends a request for retransmission
D
A method of compressing data using autonomous reiterative Q codes prior to final encoding
T8D12
Which of the following best describes an amateur radio mesh network?
A
An amateur-radio data network using commercial Wi-Fi equipment with modified firmware
B
A wide-bandwidth digital voice mode employing DMR protocols
C
An amateur-radio satellite communications network using modified commercial satellite TV hardware
D
An internet linking protocol allowing communication through repeaters around the world
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