Which characteristic is applicable to DTV transmitters?

The correct answer indicates that DTV transmitters must utilize solid state components for VHF transmission while employing vacuum tube technology for UHF transmission. This is significant due to the operational characteristics and performance requirements of different frequency bands.

At VHF frequencies, solid state components are preferred because they offer better reliability, efficiency, and performance in terms of linearity and heat management. Solid state transmitters can handle the varying demands of digital transmission more effectively and are generally more compact.

On the other hand, UHF transmitters still rely on vacuum tubes primarily because of their ability to handle higher power levels while maintaining signal integrity over greater distances. Vacuum tubes can generate the high power necessary for UHF broadcasting, which is essential for reaching wider audiences and overcoming line-of-sight propagation challenges.

Understanding this distinction between VHF and UHF technologies highlights the necessity of having different approaches in transmitter design based on the frequency band being used, which is why the answer is accurate. The other options do not reflect the industry standards and operational practices associated with DTV transmitters.