Question

High power linear amplifier is used in the audio section of the TV transmitter. (True/False)

Hint:

In analog television standards (such as NTSC, PAL, or SECAM), the video carrier is always amplitude-modulated (VSB-AM) to conserve bandwidth, while the audio carrier is frequency-modulated (FM) to ensure high-fidelity, noise-free sound.

Answer 1

Step 1: Analyzing TV Transmission Standards:
In conventional analog TV transmission, the audio and video signals are modulated and transmitted on separate carriers:

• Video Signal: Amplitude Modulated (specifically Vestigial Sideband AM). Because AM signals carry data in their amplitude envelope, any non-linear amplification will distort the picture. This requires highly precise, expensive linear power amplifiers in the video transmitter section.
• Audio Signal: Frequency Modulated (FM). Because FM signals have a constant amplitude envelope, they are highly immune to amplitude distortions. This allows the audio transmitter section to use highly efficient, non-linear class C RF power amplifiers.

Step 2: Conclusion:
Since high-power linear amplifiers are used in the video section, and not the audio section, the statement is False.