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

Question 1

T8A01 (C)

Which of the following is a form of amplitude modulation?

Answer 1

C. Single sideband

Question 2

T8A02 (A)

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

Answer 2

A. FM

Question 3

T8A03 (C)

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

Answer 3

C. SSB

Question 4

T8A04 (D)

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

Answer 4

D. FM

Question 5

T8A05 (C)

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

Answer 5

C. CW

Question 6

T8A06 (A)

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

Answer 6

A. Upper sideband

Question 7

T8A07 (C)

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

Answer 7

C. SSB signals have narrower bandwidth

Question 8

T8A08 (B)

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

Answer 8

B. 3 kHz

Question 9

T8A09 (C)

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

Answer 9

C. Between 10 and 15 kHz

Question 10

T8A10 (B)

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

Answer 10

B. About 6 MHz

Question 11

T8A11 (B)

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

Answer 11

B. 150 Hz

Question 12

T8B01 (C)

What telemetry information is typically transmitted by satellite beacons?

Answer 12

C. Health and status of the satellite

Question 13

T8B02 (B)

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

Answer 13

B. Blocking access by other users

Question 14

T8B03 (D)

Which of the following are provided by satellite tracking programs?

Answer 14

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

Question 15

T8B04 (D)

What mode of transmission is used for satellite beacons?

Answer 15

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

Question 16

T8B05 (D)

What is a satellite beacon?

Answer 16

D. A transmission from a satellite that contains status information

Question 17

T8B06 (B)

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

Answer 17

B. The Keplerian elements

Question 18

T8B07 (C)

With regard to satellite communications, what is Doppler shift?

Answer 18

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

Question 19

T8B08 (B)

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

Answer 19

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

Question 20

T8B09 (B)

What causes spin fading of satellite signals?

Answer 20

B. Rotation of the satellite and its antennas

Question 21

T8B10 (C)

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

Answer 21

C. The satellite is in a Low Earth Orbit

Question 22

T8B11 (A)

Who may receive telemetry from a space station?

Answer 22

A. Anyone who can receive the telemetry signal

Question 23

T8B12 (C)

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

Answer 23

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

Question 24

T8C01 (C)

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

Answer 24

C. Radio direction finding

Question 25

T8C02 (B) | Which of these items would be useful for a hidden transmitter hunt?

Answer 25

B. A directional antenna

Question 26

T8C03 (A) | What operating activity involves contacting as many stations as possible during a specified period?

Answer 26

A. Contesting

Question 27

T8C04 (C) | Which of the following is good procedure when contacting another station in a radio contest?

Answer 27

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

Question 28

T8C05 (A) | What is a grid locator?

Answer 28

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

Question 29

T8C06 (B) | How is access to some IRLP nodes accomplished?

Answer 29

B. By using DTMF signals

Question 30

T8C07 (D) | What is meant by Voice Over Internet Protocol (VoIP) as used in amateur radio?

Answer 30

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

Question 31

T8C08 (A) | What is the Internet Radio Linking Project (IRLP)?

Answer 31

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

Question 32

T8C09 (D) | How might you obtain a list of active nodes that use VoIP?

Answer 32

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

Question 33

T8C10 (D) | What must be done before you may use the Echolink system to communicate using a repeater?

Answer 33

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

Question 34

T8C11 (A) | What name is given to an amateur radio station that is used to connect other amateur stations to the internet?

Answer 34

A. A gateway

Question 35

T8D01 (D) | Which of the following is a digital communications mode?

Answer 35

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

Question 36

T8D02 (A) | What does the term “APRS” mean?

Answer 36

A. Automatic Packet Reporting System

Question 37

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?

Answer 37

D. A Global Positioning System receiver

Question 38

T8D04 (C) | What type of transmission is indicated by the term "NTSC?"

Answer 38

C. An analog fast scan color TV signal

Question 39

T8D05 (A) | Which of the following is an application of APRS (Automatic Packet Reporting System)?

Answer 39

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

Question 40

T8D06 (B) | What does the abbreviation "PSK" mean?

Answer 40

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

Question 41

T8D08 (D) | Which of the following may be included in packet transmissions?

Answer 41

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

Question 42

T8D09 (C) | What code is used when sending CW in the amateur bands?

Answer 42

C. International Morse

Question 43

T8D10 (D) | Which of the following operating activities is supported by digital mode software in the WSJT suite?

Answer 43

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

Question 44

T8D11 (C) | What is an ARQ transmission system?

Answer 44

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

Question 45

T8D12 (A) | Which of the following best describes Broadband-Hamnet(TM), also referred to as a high-speed multi-media network?

Answer 45

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

Question 46

T8D13 (B) | What is FT8?

Answer 46

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

Question 47

T8D14 (C) | What is an electronic keyer?

Answer 47

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