Which component of IFF operation transmits an interrogation signal?

In the context of IFF (Identification Friend or Foe) operations, the component that transmits an interrogation signal is the interrogator. The primary function of the interrogator is to send out specific signals that prompt responses from transponders, which are devices onboard friendly aircraft or ground units. When the interrogator emits an interrogation signal, it typically includes a unique identifier or code that helps to differentiate friendly units from potential threats.

The interrogator is essential for establishing secure and accurate communication in air defense and military operations. It ensures that the appropriate transponders respond correctly, helping to avoid any confusion during operations.

While transponders play a crucial role in responding to these signals and providing the requested information, it is the interrogator that is responsible for initiating the communication process. The receiver is typically involved in capturing signals but not in transmitting them, and the encoder's function is related to encoding data rather than transmitting interrogation signals.