What determines the spacing between pulses transmitted by the interrogator?

The spacing between pulses transmitted by the interrogator is determined by the mode of operation. This is because the mode of operation refers to the specific way in which the interrogator is programmed to operate, which includes aspects such as the pulse repetition frequency, duty cycle, and overall communication protocol being used.

In systems such as radar or interrogators used in transponder communications, different modes may dictate how frequently signals are sent and how the timing between those signals is structured. For instance, certain operational modes may require a rapid succession of pulses for tracking purposes, while others may delineate longer intervals between the pulses to suit different detection or identification tasks.

This operational structure can vary depending on the specific application, leading to the necessity for distinct pulse spacing to achieve desired performance and communication clarity. This importance of the operational mode in manipulating pulse timing makes it the key factor determining spacing.