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

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

• A. More than 10 MHz
• B. About 6 MHz
• C. About 3 MHz
• D. About 1 MHz

Answer: (B)

Analog fast-scan television (TV) transmissions on the 70 cm band typically occupy a bandwidth of about 6 MHz. This bandwidth is determined by the requirements for transmitting video signals, which need sufficient space to accommodate the quality of the image being broadcast. In fast-scan TV, the signal must effectively carry the visual information at a rate that allows for smooth motion and good resolution, which is why 6 MHz is considered an appropriate bandwidth. This is sufficient to handle the video information while also allowing for some margin to account for transmission imperfections and other factors. When considering the other options, they do not accurately reflect the technical requirements needed for quality analog TV transmission. A bandwidth greater than 10 MHz is excessive for this application, and values like about 3 MHz or about 1 MHz would be insufficient to maintain proper picture quality and frame rates for fast-scan television, resulting in a degraded viewing experience. Therefore, the selection of about 6 MHz aligns with the standards used in the field for effective transmission of analog fast-scan TV signals on the 70 cm band.

Analog fast-scan television (TV) transmissions on the 70 cm band typically occupy a bandwidth of about 6 MHz. This bandwidth is determined by the requirements for transmitting video signals, which need sufficient space to accommodate the quality of the image being broadcast.

In fast-scan TV, the signal must effectively carry the visual information at a rate that allows for smooth motion and good resolution, which is why 6 MHz is considered an appropriate bandwidth. This is sufficient to handle the video information while also allowing for some margin to account for transmission imperfections and other factors.

When considering the other options, they do not accurately reflect the technical requirements needed for quality analog TV transmission. A bandwidth greater than 10 MHz is excessive for this application, and values like about 3 MHz or about 1 MHz would be insufficient to maintain proper picture quality and frame rates for fast-scan television, resulting in a degraded viewing experience. Therefore, the selection of about 6 MHz aligns with the standards used in the field for effective transmission of analog fast-scan TV signals on the 70 cm band.