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Technician Class Exam Question Pool

effective 7/01/2014 thru 6/30/2018

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Topic T8: Communication Modes and Methods


T8A-2014: Modulation modes: bandwidth of various signals; choice of emission type

T8A01-2014: Which of the following is a form of amplitude modulation?

Single sideband

Spread-spectrum

Packet radio

Phase shift keying



T8A02-2014: What type of modulation is most commonly used for VHF packet radio transmissions?

FM

SSB

AM

Spread Spectrum



T8A03-2014: Which type of voice mode is most often used for long-distance (weak signal) contacts on the VHF and UHF bands?

SSB

FM

DRM

PM



T8A04-2014: Which type of modulation is most commonly used for VHF and UHF voice repeaters?

FM

AM

SSB

PSK



T8A05-2014: Which of the following types of emission has the narrowest bandwidth?

CW

FM voice

SSB voice

Slow-scan TV



T8A06-2014: Which sideband is normally used for 10 meter HF, VHF and UHF single-sideband communications?

Upper sideband

Lower sideband

Suppressed sideband

Inverted sideband



T8A07-2014: What is the primary advantage of single sideband over FM for voice transmissions?

SSB signals have narrower bandwidth

SSB signals are easier to tune

SSB signals are less susceptible to interference

All of these choices are correct



T8A08-2014: What is the approximate bandwidth of a single sideband voice signal?

3 kHz

1 kHz

6 kHz

15 kHz



T8A09-2014: What is the approximate bandwidth of a VHF repeater FM phone signal?

Between 10 and 15 kHz

Less than 500 Hz

About 150 kHz

Between 50 and 125 kHz



T8A10-2014: What is the typical bandwidth of analog fast-scan TV transmissions on the 70 cm band?

About 6 MHz

More than 10 MHz

About 3 MHz

About 1 MHz



T8A11-2014: What is the approximate maximum bandwidth required to transmit a CW signal?

150 Hz

2.4 kHz

1000 Hz

15 kHz






T8B-2014: Amateur satellite operation; Doppler shift, basic orbits, operating protocols; control operator, transmitter power considerations; satellite tracking; digital modes

T8B01-2014: Who may be the control operator of a station communicating through an amateur satellite or space station?

Any amateur whose license privileges allow them to transmit on the satellite uplink frequency

Only an Amateur Extra Class operator

A General Class licensee or higher licensee who has a satellite operator certification

Only an Amateur Extra Class operator who is also an AMSAT member



T8B02-2014: How much transmitter power should be used on the uplink frequency of an amateur satellite or space station?

The minimum amount of power needed to complete the contact

The maximum power of your transmitter

No more than half the rating of your linear amplifier

Never more than 1 watt



T8B03-2014: Which of the following are provided by satellite tracking programs?

All of these answers are correct

Maps showing the real-time position of the satellite track over the earth

The time, azimuth, and elevation of the start, maximum altitude, and end of a pass

The apparent frequency of the satellite transmission, including effects of Doppler shift



T8B04-2014: Which amateur stations may make contact with an amateur station on the International Space Station using 2 meter and 70 cm band amateur radio frequencies?

Any amateur holding a Technician or higher class license

Only members of amateur radio clubs at NASA facilities

Only the astronaut's family members who are hams

You cannot talk to the ISS on amateur radio frequencies



T8B05-2014: What is a satellite beacon?

A transmission from a space station that contains information about a satellite

The primary transmit antenna on the satellite

An indicator light that that shows where to point your antenna

A reflective surface on the satellite



T8B06-2014: Which of the following are inputs to a satellite tracking program?

The Keplerian elements

The weight of the satellite

The last observed time of zero Doppler shift

All of these answers are correct



T8B07-2014: With regard to satellite communications, what is Doppler shift?

An observed change in signal frequency caused by relative motion between the satellite and the earth station

A change in the satellite orbit

A mode where the satellite receives signals on one band and transmits on another

A special digital communications mode for some satellites



T8B08-2014: What is meant by the statement that a satellite is operating in mode U/V?

The satellite uplink is in the 70 cm band and the downlink is in the 2 meter band

The satellite uplink is in the 15 meter band and the downlink is in the 10 meter band

The satellite operates using ultraviolet frequencies

The satellite frequencies are usually variable



T8B09-2014: What causes spin fading when referring to satellite signals?

Rotation of the satellite and its antennas

Circular polarized noise interference radiated from the sun

Doppler shift of the received signal

Interfering signals within the satellite uplink band



T8B10-2014: What do the initials LEO tell you about an amateur satellite?

The satellite is in a Low Earth Orbit

The satellite battery is in Low Energy Operation mode

The satellite is performing a Lunar Ejection Orbit maneuver

The satellite uses Light Emitting Optics



T8B11-2014: What is a commonly used method of sending signals to and from a digital satellite?

FM Packet

USB AFSK

PSK31

WSJT






T8C-2014: Operating activities: radio direction finding; radio control; contests; linking over the Internet; grid locators

T8C01-2014: Which of the following methods is used to locate sources of noise interference or jamming?

Radio direction finding

Echolocation

Doppler radar

Phase locking



T8C02-2014: Which of these items would be useful for a hidden transmitter hunt?

A directional antenna

Calibrated SWR meter

A calibrated noise bridge

All of these choices are correct



T8C03-2014: What popular operating activity involves contacting as many stations as possible during a specified period of time?

Contesting

Net operations

Public service events

Simulated emergency exercises



T8C04-2014: Which of the following is good procedure when contacting another station in a radio contest?

Send only the minimum information needed for proper identification and the contest exchange

Be sure to sign only the last two letters of your call if there is a pileup calling the station

Work the station twice to be sure that you are in his log

All of these choices are correct



T8C05-2014: What is a grid locator?

A letter-number designator assigned to a geographic location

A letter-number designator assigned to an azimuth and elevation

An instrument for neutralizing a final amplifier

An instrument for radio direction finding



T8C06-2014: How is access to an IRLP node accomplished?

By using DTMF signals

By obtaining a password which is sent via voice to the node

By entering the proper Internet password

By using CTCSS tone codes



T8C07-2014: What is the maximum power allowed when transmitting telecommand signals to radio controlled models?

1 watt

500 milliwatts

25 watts

1500 watts



T8C08-2014: What is required in place of on-air station identification when sending signals to a radio control model using amateur frequencies?

A label indicating the licensee’s name, call sign and address must be affixed to the transmitter

Voice identification must be transmitted every 10 minutes

Morse code ID must be sent once per hour

A flag must be affixed to the transmitter antenna with the station call sign in 1 inch high letters or larger



T8C09-2014: How might you obtain a list of active nodes that use VoIP?

From a repeater directory

From the FCC Rulebook

From your local emergency coordinator

From the local repeater frequency coordinator



T8C10-2014: How do you select a specific IRLP node when using a portable transceiver?

Use the keypad to transmit the IRLP node ID

Choose a specific CTCSS tone

Choose the correct DSC tone

Access the repeater autopatch



T8C11-2014: What name is given to an amateur radio station that is used to connect other amateur stations to the Internet?

A gateway

A repeater

A digipeater

A beacon



T8C12-2014: What is meant by Voice Over Internet Protocol (VoIP) as used in amateur radio?

A method of delivering voice communications over the Internet using digital techniques

A set of rules specifying how to identify your station when linked over the Internet to another station

A set of guidelines for working DX during contests using Internet access

A technique for measuring the modulation quality of a transmitter using remote sites monitored via the Internet



T8C13-2014: What is the Internet Radio Linking Project (IRLP)?

A technique to connect amateur radio systems, such as repeaters, via the Internet using Voice Over Internet Protocol

A system for providing access to websites via amateur radio

A system for informing amateurs in real time of the frequency of active DX stations

A technique for measuring signal strength of an amateur transmitter via the Internet






T8D-2014: Non-voice communications: image signals; digital modes; CW; packet; PSK31; APRS; error detection and correction; NTSC

T8D01-2014: Which of the following is an example of a digital communications method?

All of these choices are correct

Packet

PSK31

MFSK



T8D02-2014: What does the term “APRS” mean?

Automatic Packet Reporting System

Associated Public Radio Station

Auto Planning Radio Set-up

Advanced Polar Radio System



T8D03-2014: Which of the following devices provides data to the transmitter when sending automatic position reports from a mobile amateur radio station?

A Global Positioning System receiver

The vehicle speedometer

A WWV receiver

A connection to a broadcast FM sub-carrier receiver



T8D04-2014: What type of transmission is indicated by the term NTSC?

An analog fast scan color TV signal

A Normal Transmission mode in Static Circuit

A special mode for earth satellite uplink

A frame compression scheme for TV signals



T8D05-2014: Which of the following is an application of APRS (Automatic Packet Reporting System)?

Providing real time tactical digital communications in conjunction with a map showing the locations of stations

Showing automatically the number of packets transmitted via PACTOR during a specific time interval

Providing voice over Internet connection between repeaters

Providing information on the number of stations signed into a repeater



T8D06-2014: What does the abbreviation PSK mean?

Phase Shift Keying

Pulse Shift Keying

Packet Short Keying

Phased Slide Keying



T8D07-2014: What is PSK31?

A low-rate data transmission mode

A high-rate data transmission mode

A method of reducing noise interference to FM signals

A method of compressing digital television signals



T8D08-2014: Which of the following may be included in packet transmissions?

All of these choices are correct

A check sum which permits error detection

A header which contains the call sign of the station to which the information is being sent

Automatic repeat request in case of error



T8D09-2014: What code is used when sending CW in the amateur bands?

International Morse

Baudot

Hamming

Gray



T8D10-2014: Which of the following can be used to transmit CW in the amateur bands?

All of these choices are correct

Straight Key

Electronic Keyer

Computer Keyboard



T8D11-2014: What is an ARQ transmission system?

A digital scheme whereby the receiving station detects errors and sends a request to the sending station to retransmit the information

A special transmission format limited to video signals

A system used to encrypt command signals to an amateur radio satellite

A method of compressing the data in a message so more information can be sent in a shorter time





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