Which component connects one transmitter to the antenna in the AN/MPN-14K LCC?

The waveguide switch is the correct choice for connecting one transmitter to the antenna in the AN/MPN-14K LCC system. A waveguide switch plays a critical role in directing radio frequency signals from the transmitter to the antenna or other components of the system. It allows for the selection and routing of the transmitted signal efficiently while minimizing losses and maintaining the integrity of the signal during transmission.

In the context of radar systems like the AN/MPN-14K, the waveguide switch can effectively control the flow of signals, enabling the system to switch between multiple antennas or different paths without significant performance degradation. This functionality is essential for optimizing operation and ensuring that the correct signals are transmitted as needed.

Other components like the circulator, dummy load, and transmitter each have specific functions that do not involve connecting the transmitter directly to the antenna. A circulator typically serves to separate signals going in different directions, a dummy load is used for testing to absorb power rather than transmitting it, and the transmitter is the source of the signal itself. Therefore, the waveguide switch is specifically designed for the connection task in this scenario.