What is the main disadvantage of a microwave telecommunication relay station that relies solely on a local AC power source?

A microwave telecommunication relay station that relies solely on a local AC power source has the significant disadvantage of becoming inoperable if the AC power is lost. This reliance on a single power source means that any interruption to that power—due to an outage, maintenance, or unforeseen events—can lead to an immediate loss of functionality. Microwave relay stations are essential for transmitting signals over distances, and without a reliable power source, they cannot fulfill their purpose, leading to potential communication failures or system downtimes.

While aspects like operational costs, maintenance needs, and signal range are important to consider, they do not directly relate to the immediate operational capability of the telecommunication relay. In contrast, the dependency on local AC power poses a clear vulnerability; hence, ensuring a secure and continuous power source is vital for the reliable operation of such stations.