Which of the following is a form of amplitude modulation?
CSingle sideband
technician pool
Subelement T8 question review
All 47 official questions with the exact winning phrase marked.
What type of modulation is commonly used for VHF packet radio transmissions?
AFM or PM
Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands?
CSSB
Which type of modulation is commonly used for VHF and UHF voice repeaters?
DFM or PM
Which of the following signal types has the narrowest bandwidth?
CCW
Which sideband is normally used for 10-meter HF, VHF, and UHF single-sideband communications?
AUpper sideband
What is one characteristic of single sideband (SSB) compared to FM?
CSSB signals have narrower bandwidth
What is the approximate bandwidth of a typical single sideband (SSB) voice signal?
B3 kHz
What is the approximate bandwidth of an FM voice signal on VHF repeaters?
CBetween 10 and 15 kHz
What is the approximate bandwidth of AM fast-scan TV transmissions?
BAbout 6 MHz
What is the approximate bandwidth required to transmit a CW signal?
B150 Hz
Which of the following is a disadvantage of FM compared with single sideband?
BOnly one signal can be received at a time
What telemetry information is typically transmitted by satellite beacons?
CHealth and status of the satellite
What is the impact of using excessive effective radiated power on a satellite uplink?
BBlocking access by other users
Which of the following are provided by satellite tracking programs?
DAll these choices are correct
What mode of transmission is commonly used by amateur radio satellites?
DAll these choices are correct
What is a satellite beacon?
DA transmission from a satellite that contains status information
Which of the following are inputs to a satellite tracking program?
BThe Keplerian elements
What is Doppler shift in reference to satellite communications?
CAn observed change in signal frequency caused by relative motion between the satellite and Earth station
What does it mean if a satellite is operating in U/V mode?
BThe satellite uplink is in the 70-centimeter band and the downlink is in the 2-meter band
What causes spin fading of satellite signals?
BRotation of the satellite and its antennas
What does the term LEO mean in reference to communication satellites?
DLow Earth Orbit, which has a period of around 100 minutes
Who is permitted to receive telemetry from an amateur radio satellite?
AAnyone
Which of the following is a way to determine whether your satellite uplink power into a linear transponder satellite is neither too low nor too high?
CYour signal strength on the downlink should be about the same as the beacon
Which of the following methods is used to locate sources of noise interference or jamming?
CRadio direction finding
Which of these items would be useful for a hidden transmitter hunt?
BA directional antenna
What operating activity involves contacting as many stations as possible during a specified period?
DContesting
Which of the following is good practice when contacting another station in a contest?
CSending only the minimum information needed for proper identification and the contest exchange
What is a grid locator?
AA letter-number designator assigned to a geographic location
How is over the air access to Internet Radio Linking Project (IRLP) nodes accomplished?
BBy using Dual-Tone Multi-Frequency (DTMF) signals
What is Voice Over Internet Protocol (VoIP)?
DA method of delivering voice communications over the internet using digital techniques
What is the Internet Radio Linking Project (IRLP)?
AA technique to connect amateur radio systems, such as repeaters, via the internet
Which of the following protocols enables an amateur station to transmit through a repeater without using a radio to initiate the transmission?
DEchoLink
What is required before using the EchoLink system?
CRegister your call sign and provide proof of license
What is an amateur radio station that connects other amateur stations to the internet?
AA gateway
Which of the following is a digital communications mode?
DAll these choices are correct
What is FT8?
BA digital mode capable of low signal-to-noise operation
What kind of data can be transmitted by APRS?
DAll these choices are correct
What is meant by the term "NTSC?"
CAn analog fast-scan color TV signal
Which of the following is an application of APRS?
AProviding real-time tactical digital communications in conjunction with a map showing the locations of stations
What does the abbreviation "PSK" mean?
BPhase Shift Keying
Which of the following describes DMR?
AA technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
Which of the following is included in packet radio transmissions?
DAll these choices are correct
What is CW?
DAnother name for a Morse code transmission
Which of the following operating activities is supported by digital mode software in the WSJT-X software suite?
DAll these choices are correct
What is the role of ARQ in a transmission system?
CAn error correction method in which the receiving station detects errors and sends a request for retransmission
Which of the following best describes an amateur radio mesh network?
AAn amateur-radio data network using commercial Wi-Fi equipment with modified firmware