Which disadvantage is associated with mechanical modulators?

The choice indicating that the microphone must be located near the transmitter highlights a significant disadvantage of mechanical modulators. This requirement often results from the design and operational principles of mechanical modulation systems, which can include components that are sensitive to the distance and environment in which they operate.

In many cases, the microphone may need to be physically close to the transmitter to ensure optimal performance and clarity of the audio signal. This limitation can be inconvenient, especially in settings where mobility or distance from the transmitter is desirable. It restricts the flexibility of positioning both the microphone and the sound source, potentially impacting usability in various scenarios.

While the other options mention different aspects, such as power consumption and modulation accuracy, they do not specifically address the practical issue of microphone placement relative to the transmitter, which can significantly affect the overall effectiveness of the communication system.