- ERP is Effective Radiated Power of the station in a given direction
- It is calculated by adding the transmitter power (dBW), antenna gain (dB) and subtracting feeder loss
- For a 100W Tx into an 7dB Gain antenna with a feeder loss of 1dB
- ERP = 20 + 7 – 1
- = 26dBW (400W ERP)
- Has a bearing on radiation exposure limits