With an improper impedance match between a 30 watt transmitter and the antenna, and 5 watts reflected, how much power is actually radiated?

To determine the amount of power actually radiated by the antenna, you start with the total power output from the transmitter and then account for the power that is reflected due to an impedance mismatch.

In this scenario, the transmitter outputs 30 watts of power. However, if there is 5 watts of reflected power, this indicates that not all the power is being effectively transmitted through the antenna. The actual power radiated can be calculated by subtracting the reflected power from the total power output.

So, you take the 30 watts provided by the transmitter and subtract the 5 watts that are reflected. This gives you:

30 watts (transmitted power) - 5 watts (reflected power) = 25 watts (radiated power).

This calculation illustrates that with the impedance mismatch leading to reflected power, only 25 watts of power is effectively radiated by the antenna. This makes the selection of 25 watts as the accurate representation of the power radiated.