Which statement about Semi-Active Homing is not true?

The statement that is not true regarding Semi-Active Homing is that it has both the transmitter and receiver within the missile. In Semi-Active Homing systems, the missile does indeed typically contain a receiver to detect the reflected signals from a target illuminated by a separate, external transmitter (such as a radar system). This means that the guidance of the missile is reliant on an external source to provide the necessary targeting data, rather than having both functions located within the missile itself.

The other statements are accurate reflections of Semi-Active Homing systems. As the missile approaches the target, the guidance improves due to the increased resolution and detail available from the reflected signals. Moreover, Semi-Active Homing systems generally have a longer range than Passive homing systems since they can utilize powerful illuminating signals over greater distances. Finally, the dependence on energy that is illuminated or designated by a directing beam, such as infrared or radio energy, is a fundamental characteristic of Semi-Active Homing technology, allowing it to effectively track and home in on targets.