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Ham Technician 7/01/2018-6/30/2022 > SUBELEMENT T8 – Modulation modes: amateur satellite operation; operating activities; non-voice and digital communications – [4 Exam Questions - 4 Groups] > Flashcards

SUBELEMENT T8 – Modulation modes: amateur satellite operation; operating activities; non-voice and digital communications – [4 Exam Questions - 4 Groups] Flashcards

1
Q

T8A01 (C)

Which of the following is a form of amplitude modulation?

A

C. Single sideband

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2
Q

T8A02 (A)

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

A

A. FM

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3
Q

T8A03 (C)

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

A

C. SSB

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4
Q

T8A04 (D)

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

A

D. FM

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5
Q

T8A05 (C)

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

A

C. CW

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6
Q

T8A06 (A)

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

A

A. Upper sideband

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7
Q

T8A07 (C)

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

A

C. SSB signals have narrower bandwidth

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8
Q

T8A08 (B)

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

A

B. 3 kHz

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9
Q

T8A09 (C)

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

A

C. Between 10 and 15 kHz

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10
Q

T8A10 (B)

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

A

B. About 6 MHz

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11
Q

T8A11 (B)

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

A

B. 150 Hz

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12
Q

T8B01 (C)

What telemetry information is typically transmitted by satellite beacons?

A

C. Health and status of the satellite

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13
Q

T8B02 (B)

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

A

B. Blocking access by other users

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14
Q

T8B03 (D)

Which of the following are provided by satellite tracking programs?

A

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

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15
Q

T8B04 (D)

What mode of transmission is used for satellite beacons?

A

A. RTTY
B. CW
C. Packet
D. All of these choices are correct

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16
Q

T8B05 (D)

What is a satellite beacon?

A

D. A transmission from a satellite that contains status information

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17
Q

T8B06 (B)

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

A

B. The Keplerian elements

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18
Q

T8B07 (C)

With regard to satellite communications, what is Doppler shift?

A

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

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19
Q

T8B08 (B)

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

A

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

20
Q

T8B09 (B)

What causes spin fading of satellite signals?

A

B. Rotation of the satellite and its antennas

21
Q

T8B10 (C)

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

A

C. The satellite is in a Low Earth Orbit

22
Q

T8B11 (A)

Who may receive telemetry from a space station?

A

A. Anyone who can receive the telemetry signal

23
Q

T8B12 (C)

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

A

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

24
Q

T8C01 (C)

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

A

C. Radio direction finding

25
Q

T8C02 (B)

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

A

B. A directional antenna

26
Q

T8C03 (A)

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

A

A. Contesting

27
Q

T8C04 (C)

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

A

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

28
Q

T8C05 (A)

What is a grid locator?

A

A. A letter-number designator assigned to a geographic location

29
Q

T8C06 (B)

How is access to some IRLP nodes accomplished?

A

B. By using DTMF signals

30
Q

T8C07 (D)

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

A

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

31
Q

T8C08 (A)

What is the Internet Radio Linking Project (IRLP)?

A

A. A technique to connect amateur radio systems, such as repeaters, via the internet using Voice Over Internet Protocol (VoIP)

32
Q

T8C09 (D)

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

A

A. By subscribing to an on line service
B. From on line repeater lists maintained by the local repeater frequency coordinator
C. From a repeater directory
D. All of these choices are correct

33
Q

T8C10 (D)

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

A

D. You must register your call sign and provide proof of license

34
Q

T8C11 (A)

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

A

A. A gateway

35
Q

T8D01 (D)

Which of the following is a digital communications mode?

A

A. Packet radio
B. IEEE 802.11
C. JT65
D. All of these choices are correct

36
Q

T8D02 (A)

What does the term “APRS” mean?

A

A. Automatic Packet Reporting System

37
Q

T8D03 (D)
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

D. A Global Positioning System receiver

38
Q

T8D04 (C)

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

A

C. An analog fast scan color TV signal

39
Q

T8D05 (A)

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

A

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

40
Q

T8D06 (B)

What does the abbreviation “PSK” mean?

A

B. An automatic position tracking mode for FM mobiles communicating through repeaters

41
Q

T8D08 (D)

Which of the following may be included in packet transmissions?

A

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

42
Q

T8D09 (C)

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

A

C. International Morse

43
Q

T8D10 (D)

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

A

A. Moonbounce or Earth-Moon-Earth
B. Weak-signal propagation beacons
C. Meteor scatter
D. All of these choices are correct

44
Q

T8D11 (C)

What is an ARQ transmission system?

A

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

45
Q

T8D12 (A)

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

A

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

46
Q

T8D13 (B)

What is FT8?

A

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

47
Q

T8D14 (C)

What is an electronic keyer?

A

C. A device that assists in manual sending of Morse code

Ham Technician 7/01/2018-6/30/2022 (10 decks)

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