Calculation of ERP and EIRP


If you know the lenght of your transmission line and have

an approximate value for the loss in the transmission line

per 100 ft, use this spreadsheet:


Power of Transmitted signal Pt (W):


Enter Value

Gain of Transmitting Antenna Gt (dBi):


Enter Value

Loss in TX transmission line (db/100ft):


Enter Value

Lenght of TX transmission line (m):


Enter Value

Total loss in transmission line (db):


Calculated

ERP (dBW):


Calculated

EIRP (dBW):


Calculated

dBm:


Calculated

ERP (W):


Calculated

EIRP (W):


Calculated



If you have measured the loss of your transmission line

at the frequency you want to transmit on,

use this spreadsheet:


Power of Transmitted signal Pt (W):


Enter Value

Gain of Transmitting Antenna Gt (dBi):


Enter Value

Loss in TX transmission line (db):


Enter Value

ERP (dBW):


Calculated

EIRP (dBW):


Calculated

dBm:


Calculated

ERP (W):


Calculated

EIRP (W):


Calculated



* To calculate the power at the end of a transmission line,

set the antenna gain to 0 dB.
