HAM Technician T8

Which of the following is a form of amplitude modulation?
A.  Spread spectrum
B.  Single sideband
C.  Packet radio
D.  Phase shift keying (PSK)

What type of modulation is most commonly used for VHF packet radio transmissions?
A.  PSK
B.  SSB
C.  AM
D.  FM

Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands?
A.  DRM
B.  PM
C.  SSB
D.  FM

Which type of modulation is most commonly used for VHF and UHF voice repeaters?
A.  AM
B.  PSK
C.  FM
D.  SSB

Which of the following types of emission has the narrowest bandwidth?
A.  SSB voice
B.  CW
C.  FM voice
D.  Slow-scan TV

Which sideband is normally used for 10 meter HF, VHF, and UHF single sideband communications?
A.  Upper sideband
B.  Suppressed sideband
C.  Inverted sideband
D.  Lower sideband

What is an advantage of single sideband (SSB) over FM for voice transmissions?
A.  All of these choices are correct
B.  SSB signals have narrower bandwidth
C.  SSB signals are easier to tune
D.  SSB signals are less susceptible to interference

What is the approximate bandwidth of a single sideband (SSB) voice signal?
A.  6 kHz
B.  1 kHz
C.  3 kHz
D.  15 kHz

What is the approximate bandwidth of a VHF repeater FM phone signal?
A.  Between 50 and 125 kHz
B.  Between 10 and 15 kHz
C.  Less than 500 Hz
D.  About 150 kHz

What is the typical bandwidth of analog fast-scan TV transmissions on the 70 centimeter band?
A.  About 1 MHz
B.  More than 10 MHz
C.  About 3 MHz
D.  About 6 MHz

What is the approximate maximum bandwidth required to transmit a CW signal?
A.  2.4 kHz
B.  150 Hz
C.  15 kHz
D.  1000 Hz

What telemetry information is typically transmitted by satellite beacons?
A.  Time of day accurate to plus or minus 1/10 second
B.  Health and status of the satellite
C.  All of these choices are correct
D.  The signal strength of received signals

What is the impact of using too much effective radiated power on a satellite uplink?
A.  Blocking access by other users
B.  Possibility of rebooting the satellite control computer
C.  Overloading the satellite batteries
D.  Possibility of commanding the satellite to an improper mode

Which of the following are provided by satellite tracking programs?
A.  Maps showing the real-time position of the satellite track over the earth
B.  The apparent frequency of the satellite transmission, including effects of Doppler shift
C.  The time, azimuth, and elevation of the start, maximum altitude, and end of a pass
D.  All of these choices are correct

What mode of transmission is commonly used by amateur radio satellites?
A.  FM
B.  All of these choices are correct
C.  CW/data
D.  SSB

What is a satellite beacon?
A.  An indicator light that shows where to point your antenna
B.  The primary transmit antenna on the satellite
C.  A reflective surface on the satellite
D.  A transmission from a satellite that contains status information

Which of the following are inputs to a satellite tracking program?
A.  The Keplerian elements
B.  The weight of the satellite
C.  All of these choices are correct
D.  The last observed time of zero Doppler shift

With regard to satellite communications, what is Doppler shift?
A.  An observed change in signal frequency caused by relative motion between the satellite and the earth station
B.  A change in the satellite orbit
C.  A special digital communications mode for some satellites
D.  A mode where the satellite receives signals on one band and transmits on another

What is meant by the statement that a satellite is operating in mode U/V?
A.  The satellite frequencies are usually variable
B.  The satellite operates using ultraviolet frequencies
C.  The satellite uplink is in the 70 centimeter band and the downlink is in the 2 meter band
D.  The satellite uplink is in the 15 meter band and the downlink is in the 10 meter band

What causes spin fading of satellite signals?
A.  Interfering signals within the satellite uplink band
B.  Doppler shift of the received signal
C.  Circular polarized noise interference radiated from the sun
D.  Rotation of the satellite and its antennas

What do the initials LEO tell you about an amateur satellite?
A.  The satellite is performing a Lunar Ejection Orbit maneuver
B.  The satellite battery is in Low Energy Operation mode
C.  The satellite is in a Low Earth Orbit
D.  The satellite uses Light Emitting Optics

Who may receive telemetry from a space station?
A.  A licensed radio amateur who has been certified by the protocol developer
B.  A licensed radio amateur with a transmitter equipped for interrogating the satellite
C.  A licensed radio amateur who has registered for an access code from AMSAT
D.  Anyone who can receive the telemetry signal

Which of the following is a good way to judge whether your uplink power is neither too low nor too high?
A.  Listen for distortion on your downlink signal
B.  Check your signal strength report in the telemetry data
C.  All of these choices are correct
D.  Your 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?
A.  Phase locking
B.  Radio direction finding
C.  Doppler radar
D.  Echolocation

Which of these items would be useful for a hidden transmitter hunt?
A.  A directional antenna
B.  Calibrated SWR meter
C.  A calibrated noise bridge
D.  All of these choices are correct

What operating activity involves contacting as many stations as possible during a specified period?
A.  Public service events
B.  Net operations
C.  Simulated emergency exercises
D.  Contesting

Which of the following is good procedure when contacting another station in a radio contest?
A.  Sign only the last two letters of your call if there are many other stations calling
B.  Send only the minimum information needed for proper identification and the contest exchange
C.  All of these choices are correct
D.  Contact the station twice to be sure that you are in his log

What is a grid locator?
A.  A letter-number designator assigned to an azimuth and elevation
B.  An instrument for neutralizing a final amplifier
C.  A letter-number designator assigned to a geographic location
D.  An instrument for radio direction finding

How is access to some IRLP nodes accomplished?
A.  By using CTCSS tone codes
B.  By using DTMF signals
C.  By obtaining a password that is sent via voice to the node
D.  By entering the proper internet password

What is meant by Voice Over Internet Protocol (VoIP) as used in amateur radio?
A.  A set of rules specifying how to identify your station when linked over the internet to another station
B.  A technique for measuring the modulation quality of a transmitter using remote sites monitored via the internet
C.  A method of delivering voice communications over the internet using digital techniques
D.  A set of guidelines for contacting DX stations during contests using internet access

What is the Internet Radio Linking Project (IRLP)?
A.  A technique to connect amateur radio systems, such as repeaters, via the internet using Voice Over Internet Protocol (VoIP)
B.  A system for informing amateurs in real time of the frequency of active DX stations
C.  A technique for measuring signal strength of an amateur transmitter via the internet
D.  A system for providing access to websites via amateur radio

How might you obtain a list of active nodes that use VoIP?
A.  By subscribing to an on line service
B.  From a repeater directory
C.  From on line repeater lists maintained by the local repeater frequency coordinator
D.  All of these choices are correct

What must be done before you may use the EchoLink system to communicate using a repeater?
A.  You must have purchased a license to use the EchoLink software
B.  You must complete the required EchoLink training
C.  You must register your call sign and provide proof of license
D.  You must be sponsored by a current EchoLink user

What name is given to an amateur radio station that is used to connect other amateur stations to the internet?
A.  A beacon
B.  A digipeater
C.  A repeater
D.  A gateway

Which of the following is a digital communications mode?
A.  All of these choices are correct
B.  IEEE 802.11
C.  JT65
D.  Packet radio

What does the term "APRS" mean?
A.  Automatic Packet Reporting System
B.  Advanced Polar Radio System
C.  Associated Public Radio Station
D.  Auto Planning Radio Set-up

Which of the following devices is used to provide data to the transmitter when sending automatic position reports from a mobile amateur radio station?
A.  A connection to a broadcast FM sub-carrier receiver
B.  A WWV receiver
C.  The vehicle speedometer
D.  A Global Positioning System receiver

What type of transmission is indicated by the term "NTSC"?
A.  A frame compression scheme for TV signals
B.  An analog fast scan color TV signal
C.  A Normal Transmission mode in Static Circuit
D.  A special mode for earth satellite uplink

Which of the following is an application of APRS (Automatic Packet Reporting System)?
A.  Providing voice over internet connection between repeaters
B.  Providing real-time tactical digital communications in conjunction with a map showing the locations of stations
C.  Providing information on the number of stations signed into a repeater
D.  Showing automatically the number of packets transmitted via PACTOR during a specific time interval

What does the abbreviation "PSK" mean?
A.  Packet Short Keying
B.  Pulse Shift Keying
C.  Phase Shift Keying
D.  Phased Slide Keying

Which of the following best describes DMR (Digital Mobile Radio)?
A.  An automatic computer logging technique for hands-off logging when communicating while operating a vehicle
B.  A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction
C.  An automatic position tracking mode for FM mobiles communicating through repeaters
D.  A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel

Which of the following may be included in packet transmissions?
A.  A check sum 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 of these choices are correct

What code is used when sending CW in the amateur bands?
A.  Baudot
B.  International Morse
C.  All of these choices are correct
D.  Hamming

Which of the following operating activities is supported by digital mode software in the WSJT suite?
A.  All of these choices are correct
B.  Moonbounce or Earth-Moon-Earth
C.  Weak-signal propagation beacons
D.  Meteor scatter

What is an ARQ transmission system?
A.  A method of compressing the data in a message so more information can be sent in a shorter time
B.  A system used to encrypt command signals to an amateur radio satellite
C.  A special transmission format limited to video signals
D.  A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information

Which of the following best describes Broadband-Hamnet(TM), also referred to as a high-speed multi-media network?
A.  A satellite communications network using modified commercial satellite TV hardware
B.  A wide-bandwidth digital voice mode employing DRM protocols
C.  An amateur-radio-based data network using commercial Wi-Fi gear with modified firmware
D.  An internet linking protocol used to network repeaters

What is FT8?
A.  A digital slow scan TV mode with forward error correction and automatic color compensation
B.  A wideband FM voice mode
C.  An eight channel multiplex mode for FM repeaters
D.  A digital mode capable of operating in low signal-to-noise conditions that transmits on 15-second intervals

What is an electronic keyer?
A.  A device that assists in manual sending of Morse code
B.  A device for voice activated switching from receive to transmit
C.  An interlock to prevent unauthorized use of a radio
D.  A device for switching antennas from transmit to receive