SUBELEMENT T6 – Communications modes and methods – 3 exam questions - 3 groups
T6A Modulation modes, descriptions and bandwidth (AM, FM, SSB)
What are phone transmissions?
Voice transmissions by radio
Which of the following is a form of amplitude modulation?
Single sideband
What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?
A gateway
Which type of voice modulation is most often used for long distance and weak signal contacts on the VHF and UHF bands?
SSB
Which type of modulation is most commonly used for VHF and UHF voice repeaters?
FM
Which emission type has the narrowest bandwidth?
CW
Which sideband is normally used for VHF and UHF SSB communications?
Upper sideband
What is the primary advantage of single sideband over FM for voice transmissions?
SSB signals use much less bandwidth than FM signals
What is the approximate bandwidth of a single-sideband voice signal?
Between 2 and 3 kHz
What is the approximate bandwidth of a frequency-modulated voice signal?
Between 5 and 15 kHz
What is the normal bandwidth required for a conventional fast-scan TV transmission using combined video and audio on the 70-centimeter band?
About 6 MHz
T6B Voice communications, EchoLink and IRLP.
How is information transmitted between stations using Echolink?
Internet
What does the abbreviation IRLP mean?
Internet Radio Linking Project
Who may operate on the Echolink system?
Any licensed amateur radio operator
What technology do Echolink and IRLP have in common?
Voice over Internet protocol
What method is used to transfer data by IRLP?
Voice over Internet protocol
What does the term IRLP describe?
A method of linking between two or more amateur stations using the Internet
Which one of the following allows computer-to-radio linking for voice transmission?
EchoLink
What are you listening to if you hear a brief tone and then a station from Russia calling CQ on a 2-meter repeater?
An Internet linked DX station
Where might you find a list of active nodes using VoIP?
A repeater directory or the Internet
When using a portable transceiver how do you select a specific IRLP node?
Use the keypad to transmit the IRLP node numbers
T6C Non-voice communications – image communications, data, CW, packet, PSK31, Morse code techniques, Q-signals.
Which of the following is an example of a digital communications method?
Packet radio
What does the term APRS mean?
Automatic Position Reporting System
What item is required along with your normal radio for sending automatic location reports?
A global positioning system receiver
What type of transmission is indicated by the term NTSC?
A standard fast scan color television signal
What emission mode may be used by a Technician class operator in the 219 - 220 MHz frequency range?
Point-to-point digital message forwarding
What does the abbreviation PSK mean?
Phase Shift Keying
What is PSK31?
A low-rate data transmission mode that works well in noisy conditions
What sending speed is recommended when using Morse code?
Any speed at which you can reliably receive
What is a practical reason for being able to copy CW when using repeaters?
To recognize a repeater ID sent in Morse code
What is the "Q" signal used to indicate that you are receiving interference from other stations?
QRM
What is the "Q" signal used to indicate that you are changing frequency?
QSY