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Ham Radio Technician License (2018-2022) > Sub-Element T8 Modulation modes: amateur satellite operation, operating activities, non-voice & digital communications [4 Exam Questions] > Flashcards

Sub-Element T8 Modulation modes: amateur satellite operation, operating activities, non-voice & digital communications [4 Exam Questions] Flashcards

1
Q

Which of the following is a form of amplitude modulation?

A

Single sideband

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2
Q

What type of modulation is most commonly used for VHF packet radio transmissions?

A

FM

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3
Q

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

A

SSB

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4
Q

Which type of modulation is most commonly used for VHF and UHF voice repeaters?

A

FM

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5
Q

Which of the following types of emission has the narrowest bandwidth?

A

CW

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6
Q

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

A

Upper sideband

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7
Q

What is an advantage of single sideband (SSB) over FM for voice transmissions?

A

SSB signals have narrower bandwidth

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8
Q

What is the approximate bandwidth of a single sideband (SSB) voice signal?

A

3 kHz

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9
Q

What is the approximate bandwidth of a VHF repeater FM phone signal?

A

Between 10 and 15 kHz

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10
Q

What is the typical bandwidth of analog fast-scan TV transmissions on the 70 centimeter band?

A

About 6 MHz

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11
Q

What is the approximate maximum bandwidth required to transmit a CW signal?

A

150 Hz

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12
Q

What telemetry information is typically transmitted by satellite beacons?

A

Health and status of the satellite

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13
Q

What is the impact of using too much effective radiated power on a satellite uplink?

A

Blocking access by other users

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14
Q

Which of the following are provided by satellite tracking programs?

A

All of these choices are correct

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15
Q

What mode of transmission is commonly used by amateur radio satellites?

A

All of these choices are correct

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16
Q

What is a satellite beacon?

A

A transmission from a satellite that contains status information

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17
Q

Which of the following are inputs to a satellite tracking program?

A

The Keplerian elements

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18
Q

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

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19
Q

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

A

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

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20
Q

What causes spin fading of satellite signals?

A

Rotation of the satellite and its antennas

21
Q

What do the initials LEO tell you about an amateur satellite?

A

The satellite is in a Low Earth Orbit

22
Q

Who may receive telemetry from a space station?

A

Anyone who can receive the telemetry signal

23
Q

Which of the following is a good way to judge whether your uplink power is neither too low nor too high?

A

Your signal strength on the downlink should be about the same as the beacon

24
Q

Which of the following methods is used to locate sources of noise interference or jamming?

A

Radio direction finding

25
Q

Which of these items would be useful for a hidden transmitter hunt?

A

A directional antenna

26
Q

What operating activity involves contacting as many stations as possible during a specified period?

A

Contesting

27
Q

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

A

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

28
Q

What is a grid locator?

A

A letter-number designator assigned to a geographic location

29
Q

How is access to some IRLP nodes accomplished?

A

By using DTMF signals

30
Q

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

A

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

31
Q

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)

32
Q

How might you obtain a list of active nodes that use VoIP?

A

All of these choices are correct

33
Q

What must be done before you may use the EchoLink system to communicate using a repeater?

A

You must register your call sign and provide proof of license

34
Q

What name is given to an amateur radio station that is used to connect other amateur stations to the internet?

A

A gateway

35
Q

Which of the following is a digital communications mode?

A

All of these choices are correct

36
Q

What does the term “APRS” mean?

A

Automatic Packet Reporting System

37
Q

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 Global Positioning System receiver

38
Q

What type of transmission is indicated by the term “NTSC?”

A

An analog fast scan color TV signal

39
Q

Which of the following is an application of APRS (Automatic Packet Reporting System)?

A

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

40
Q

What does the abbreviation “PSK” mean?

A

Phase Shift Keying

41
Q

Which of the following best describes DMR (Digital Mobile Radio)?

A

A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel

42
Q

Which of the following may be included in packet transmissions?

A

All of these choices are correct

43
Q

What code is used when sending CW in the amateur bands?

A

International Morse

44
Q

Which of the following operating activities is supported by digital mode software in the WSJT suite?

A

All of these choices are correct

45
Q

What is an ARQ transmission system?

A

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

46
Q

Which of the following best describes Broadband-Hamnet(TM), also referred to as a high-speed multi-media network?

A

An amateur-radio-based data network using commercial Wi-Fi gear with modified firmware

47
Q

What is FT8?

A

A digital mode capable of operating in low signal-to-noise conditions that transmits on 15-second intervals

48
Q

What is an electronic keyer?

A

A device that assists in manual sending of Morse code

Ham Radio Technician License (2018-2022) (10 decks)

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