Plain-language answer: An RF wattmeter measures power at a specific point in the feed system; directional models can separate forward and reflected components within their specified accuracy.
Why it matters at the radio
The reading changes with placement, frequency, waveform, calibration, and mismatch. Power measured at the radio is not necessarily power delivered to the antenna.
What to watch in the field
Use the correct sensor range and direction, keep connectors sound, and compare readings at known reference points when diagnosing loss.
The common misunderstanding
Calling reflected power “lost power” without considering re-reflection and line loss.
Learning boundary
This lesson explains established radio and antenna practice. Current regulations, electrical and building codes, site conditions, and the exact equipment or antenna guide control legal limits, ratings, compatibility, and safety.
