What is the approximate bandwidth of AM fast-scan TV transmissions?

What is the approximate bandwidth of AM fast-scan TV transmissions?

• A. 500 kHz
• B. 1 MHz
• C. About 3 MHz
• D. 5 MHz

Answer: (C)

The correct answer is that the approximate bandwidth of AM fast-scan TV transmissions is about 3 MHz. This is due to the nature of analog television signals, particularly how they are modulated and the amount of frequency spectrum they require for proper transmission and reception. AM (Amplitude Modulation) fast-scan television carries video information along with sound, and in order to transmit a clear and stable picture, a wide bandwidth is necessary. Specifically, for standard resolution analog television, a bandwidth of approximately 3 MHz provides sufficient data to convey the image detail and sound, allowing for the desired quality of a fast-scan signal. In contrast, narrower bandwidths like 500 kHz or 1 MHz would not be able to effectively transfer the necessary detail for video transmission, resulting in poor quality. Although 5 MHz could potentially cover higher definition signals, standard definitions used in AM fast-scan TV typically settle around the 3 MHz mark. This is why 3 MHz is recognized as the standard bandwidth for such transmissions.

The correct answer is that the approximate bandwidth of AM fast-scan TV transmissions is about 3 MHz. This is due to the nature of analog television signals, particularly how they are modulated and the amount of frequency spectrum they require for proper transmission and reception.

AM (Amplitude Modulation) fast-scan television carries video information along with sound, and in order to transmit a clear and stable picture, a wide bandwidth is necessary. Specifically, for standard resolution analog television, a bandwidth of approximately 3 MHz provides sufficient data to convey the image detail and sound, allowing for the desired quality of a fast-scan signal.

In contrast, narrower bandwidths like 500 kHz or 1 MHz would not be able to effectively transfer the necessary detail for video transmission, resulting in poor quality. Although 5 MHz could potentially cover higher definition signals, standard definitions used in AM fast-scan TV typically settle around the 3 MHz mark. This is why 3 MHz is recognized as the standard bandwidth for such transmissions.