ABSTRACT
The maintenance of an amplitude modulated (AM) antenna system includes not only transmitter and tower but all components related to the system as a whole such as antenna tuning units, sample lines and monitoring. A standard AM ground system consists of 120 radials at least one-quarter (1/4) wavelength long. Measurements of AM radio frequency energy require the use of specialized test equipment. The amount of electrical maintenance needed by an antenna system is directly related to its age, complexity, and maintenance history. Grounding and bonding of antenna tuning units and other hardware in proximity of tower bases is of utmost importance to maintain stable antenna system operation. All ground radials should terminate at a common ring of copper tubing surrounding the antenna base pier. The result of conducting AM antenna system maintenance in a methodical and careful manner will be reliable and stable operation for the long run.
