Transmitters

ERP – Effective Radiated Power

  • 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