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Amateur Radio Extra 2016-2020 > Visuals & Video Modes > Flashcards

Visuals & Video Modes Flashcards

1
Q

E2B01 how many times per second is a new frame transmitted in fast scan tv?

A. 30
B. 60
C. 90
D. 120

A

A. 30

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2
Q

E2B02. How many horizontal lines makes up fast scan tv frame?

A. 30
B. 60
C. 525
D. 1080

A

C. 525

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3
Q

E2B03. How is an interlaced scanning pattern generated in a fast scan tv system ?

A. By scanning 2 fields simultaneously
B. By scanning each field from bottom to top
C. By scanning lines from left to right in one field and right to left in the next
D. By scanning odd numbered lines in one field and even numbered lines in the next

A

D. By scanning odd numbered lines in one field and even numbered lines in the next

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4
Q

E2B04. What is blanking in a video signal?

A. Synchronization of the horizontal and vertical sync pulses
B. Turning off the scanning beam while it is traveling from right to left
C. Turning off the scanning beam at the conclusion of a transmission.
D. Transmitting a black and white test pattern

A

B. Turning off the scanning beam while it is traveling from right to left

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5
Q

E2B08. Which of the following is a common method of transmitting accompanying audio with amateur fast scan tv?

A. Frequency modulated sub-carrier
B. A separate VHF or UHF audio link
C. Frequency modulation of the video carrier
D. All of these choices are correct

A

D. All of these choices are correct

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6
Q

E2B07. What is the name of the signal component that carries. Plot information in NTSC video?

A. Luminance
B. Chroma
C. Hue
D. Spectral intensity

A

B. Chroma

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7
Q

E2B06. What is vestigial sideband modulation ?

A. Amplitude modulation in which one complete sideband and a portion of the other are transmitted
B. A type of modulation in which one sideband is inverted
C. Narrow band fm modulation achieved by filtering one sideband from the audio before frequency modulating the carrier
D. Spread spectrum modulation is achieved by applying FM modulation following single side band amplitude modulation.

A

A. Amplitude modulation in which one complete sideband and a portion of the other are transmitted

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8
Q

E2B05. Which of the following is an advantage of using vestigial sideband for standard fast scan tv transmissions ?

A. The vestigial sideband carries the Audio information
B. The vestigial sideband contains chroma information.
C. Vestigial sideband reduces bandwidth while allowing for simple video detector circuitry
D. Vestigial sideband provides high frequency emphasis to sharpen the picture

A

C. Vestigial sideband reduces bandwidth while allowing for simple video detector circuitry

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9
Q

E2B18. On which of the following frequencies is one likely to find FM ATV transmissions ?

A. 14.230 MHz
B. 29.6 MHz
C. 52.525 MHz
D. 1255 MHz

A

D. 1255 MHz

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10
Q

E2B16. Which is a video standard used by North American Fast Scan ATV stations?

A. PAL
B. DRM
C Scottie
D. NTSC

A

D. NTSC

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11
Q

E2B12. How are analog SSTV images typically transmitted on the HF bands ?

A. Video is converted to equivalent Baudot representation
B. Video is converted to equivalent ASCII representation
C. Varying tone frequencies representing the video are transmitted using PSK
D. varying tones frequencies representing the video are transmitted using single sideband

A

D. varying tones frequencies representing the video are transmitted using single sideband

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12
Q

E2B17. What is the approximate bandwidth of a slow scan tv signal?

A. 600 Hz
B. 3 kHz
C. 2 MHz
D. 6 MHz

A

B. 3 kHz

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13
Q

E2B19. What special operating frequency restrictions are imposed on slow scan tv transmissions ?

A. None; they are allied in all amateur frequencies
B. They are restricted to 7.245 MHz, 14.245 MHz, 21.345 MHz, and 29.945
C. They are restricted to phone band segments and their bandwidth can be no greater than that of a voice signal of the same modulation type
D. They are not permitted above 54 MHz

A

C. They are restricted to phone band segments and their bandwidth can be no greater than that of a voice signal of the same modulation type

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14
Q

E2B13. How many lines are commonly used In Each frame of an amateur slow scan color television picture ?

A. 30 or 60
B. 60 or 100
C. 128 or 256
D. 180 or 360

A

C. 128 or 256

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15
Q

E2B15. What signals SSTV receiving equipment to begin a new picture line ?

A. Specific tone frequencies
B. Elapsed time
C. Specific tone amplitudes
D. A two tone signal

A

A. Specific tone frequencies

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16
Q

E2B14. What aspect of an amateur slow scan tv signal encodes the brightness of the picture?

A. Tone frequency
B. Tone amplitude
C. Sync amplitude
D. Sync frequency

A

A. Tone frequency

17
Q

E2B09 what hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using digital radio mondiale (DRM)?

A. A special IF converter
B. A special front end limiter
C. A special notch filter to remove synchronization pulses
D. No other hardware is needed

A

D. No other hardware is needed

18
Q

E2B10. Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based on voice or SSTV digital transmissions made on the HF amateur bands ?

A. 3 kHz
B. 10 kHz
C. 15 kHz
D. 30 kHz

19
Q

E2B11. What is the function of the vertical interval signaling (VIS) code sent as part of an SST transmission?

A. To lock the color burst oscillator in color SSTV transmissions
B. To identify the SSTV mode being used
C. To provide vertical synchronization
D. To identify the call sign of the station transmitting

A

B. To identify the SSTV mode being used

20
Q

E6F13. What is a liquid crystal display (LCD)?

A. A modern replacement for a quartz crystal oscillator which displays its fundamental frequency
B. A display utilizing a crystalline liquid and polarizing filters which become opaque when voltage is applied
C. A frequency determining unit for a transmitter or receiver
D. A display that uses a glowing liquid to remain b rightly lit in dim light

A

B. A display utilizing a crystalline liquid and polarizing filters which become opaque when voltage is applied

21
Q

E8F14 Which of the following is true of LCD displays?

A. They are hard to view in high ambient light conditions
B. They may be hard to view through polarized lenses
C. They only display alphanumeric symbols
D. All of these choices are correct.

A

B. They may be hard to view through polarized lenses

22
Q

E6E01 Which of the following is true of a charge-coupled device (CCD)?

A. Its phase shift changes rapidly with frequency
B. It is a CMOS analog-to-digital converter
C. It samples an analog signal and passes it in stages from the input to the output
D. It is used in a battery charger circuit

A

C. It samples an analog signal and passes it in stages from the input to the output

Amateur Radio Extra 2016-2020 (5 decks)

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