RF system power planning tool
ERP and EIRP calculator controls and results
Follow RF power through system loss and directional antenna gain to ERP and EIRP.
Understanding effective radiated power
ERP and EIRP combine transmitter RF power, losses before the antenna, and antenna gain in the modeled direction. They are reference conventions, not additional connector power or coverage predictions.
Power at the antenna feedpoint
System loss is applied before antenna gain. This keeps transmitter output, delivered feedpoint power, and direction-dependent effective radiated power physically distinct.
Peak gain versus useful gain
Published peak gain can overstate performance toward another azimuth or elevation. Radiation patterns can contain weaker regions, side lobes, and deep nulls.
Related planning tools
Calculate feedline loss, convert RF power units, or explore impedance mismatch.