Calculation of Induced Currents in Antenna System Anchoring Cables by Equivalent Source Substitution

The antenna systems for terrestrial broadcasting of FM radio signal are mounted on tall monotubes, which are held in place by anchoring steel cables. Due to harsh conditions and material ageing, these anchoring cables have to be subdued to regular maintanance and periodic replacements. The process of replacing the anchoring cables is difficult, lengthy and results in signal outages as currents induced in the anchoring cables, caused by strong electromagnetic field, could pose a danger to maintenance crew, therefore the antenna system cannot be radiating. The main goal of this study is to explore possible induced current calculation methods in anchoring cables as the basis for measurement in the field. Based on the calculated data it may later be possible to determine when is it necessary for the antenna system to be shut down completely and when lowering the radiated power results in the induced currents of harmless values.