Eirp calculation example

For example, a transmitting station has 1000 W (or 30 dBW) as its transmitter output and uses an antenna with a gain of 10 dBi. The cable to the antenna introduces a 3 dB loss to the signal. The station EIRP would be: 30 dBW - 3 + 10 = 37 dBW (5011 W).

1. How is EIRP calculated?
2. How do you calculate ERP power?
3. How do you calculate antenna gain?

How is EIRP calculated?

Calculation: E.I.R.P. = 16 dBm + 8 dBi – 3,2 dB – 1 dB = 19,8 dBm (i.e. the power level meets the requirements - less than 20 dBm).

How do you calculate ERP power?

To calculate ERP, Take the transmitter power output, subtract the losses from the duplexers, subtract any measurable feedline loss and add the antenna gain. Example: (2 dBd combined duplexer and feedline loss) + (5 dBd antenna gain)= 3 dBd gain.

How do you calculate antenna gain?

Assuming the antenna pattern is uniform, the gain is equal to the area of the isotropic sphere (4Br )2 divided by the sector (cross section) area.