Online courses for the ham radio license exams. eQSL - Electronic QSL Card Center

NEW Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

    Unseen questions
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2016-E2B: Television practices: fast scan television standards and techniques; slow scan television standards and techniques

2016-E2B01: How many times per second is a new frame transmitted in a fast-scan (NTSC) television system?





2016-E2B02: How many horizontal lines make up a fast-scan (NTSC) television frame?





2016-E2B03: How is an interlaced scanning pattern generated in a fast-scan (NTSC) television system?

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

By scanning two fields simultaneously

By scanning each field from bottom to top

By scanning lines from left to right in one field and right to left in the next

2016-E2B04: What is blanking in a video signal?

Turning off the scanning beam while it is traveling from right to left or from bottom to top

Synchronization of the horizontal and vertical sync pulses

Turning off the scanning beam at the conclusion of a transmission

Transmitting a black and white test pattern

2016-E2B05: Which of the following is an advantage of using vestigial sideband for standard fast-scan TV transmissions?

Vestigial sideband reduces bandwidth while allowing for simple video detector circuitry

The vestigial sideband carries the audio information

The vestigial sideband contains chroma information

Vestigial sideband provides high frequency emphasis to sharpen the picture

2016-E2B06: What is vestigial sideband modulation?

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

A type of modulation in which one sideband is inverted

Narrow-band FM modulation achieved by filtering one sideband from the audio before frequency modulating the carrier

Spread spectrum modulation achieved by applying FM modulation following single sideband amplitude modulation

2016-E2B07: What is the name of the signal component that carries color information in NTSC video?




Spectral Intensity

2016-E2B08: Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?

All of these choices are correct

Frequency-modulated sub-carrier

A separate VHF or UHF audio link

Frequency modulation of the video carrier

2016-E2B09: What hardware, other than a receiver with SSB capability and a suitable computer, is needed to decode SSTV using Digital Radio Mondiale (DRM)?

No other hardware is needed

A special IF converter

A special front end limiter

A special notch filter to remove synchronization pulses

2016-E2B10: Which of the following is an acceptable bandwidth for Digital Radio Mondiale (DRM) based voice or SSTV digital transmissions made on the HF amateur bands?

3 KHz

10 KHz

15 KHz

20 KHz

2016-E2B11: What is the function of the Vertical Interval Signaling (VIS) code sent as part of an SSTV transmission?

To identify the SSTV mode being used

To lock the color burst oscillator in color SSTV images

To provide vertical synchronization

To identify the call sign of the station transmitting

2016-E2B12: How are analog SSTV images typically transmitted on the HF bands?

Varying tone frequencies representing the video are transmitted using single sideband

Video is converted to equivalent Baudot representation

Video is converted to equivalent ASCII representation

Varying tone frequencies representing the video are transmitted using PSK

2016-E2B13: How many lines are commonly used in each frame of an amateur slow-scan color television picture?

128 or 256

30 or 60

60 or 100

180 or 360

2016-E2B14: What aspect of an amateur slow-scan television signal encodes the brightness of the picture?

Tone frequency

Tone amplitude

Sync amplitude

Sync frequency

2016-E2B15: What signals SSTV receiving equipment to begin a new picture line?

Specific tone frequencies

Elapsed time

Specific tone amplitudes

A two-tone signal

2016-E2B16: Which is a video standard used by North American Fast Scan ATV stations?





2016-E2B17: What is the approximate bandwidth of a slow-scan TV signal?

3 kHz

600 Hz

2 MHz

6 MHz

2016-E2B18: On which of the following frequencies is one likely to find FM ATV transmissions?

1255 MHz

14.230 MHz

29.6 MHz

52.525 MHz

2016-E2B19: What special operating frequency restrictions are imposed on slow scan TV transmissions?

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

None; they are allowed on all amateur frequencies

They are restricted to 7.245 MHz, 14.245 MHz, 21.345 MHz, and 28.945 MHz

They are not permitted above 54 MHz

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