EIRP and ERP Calculator: Formulas and Calculations

This page explains EIRP (Effective Isotropic Radiated Power) and ERP (Effective Radiated Power), providing calculators and their corresponding formulas.

EIRP Calculator

Use the calculator to determine the EIRP value.

Example (EIRP calculation):

• Transmit power in dBm = +20dBm
• Isotropic Antenna Gain, dBi = +10 dBi
• Cable Loss in dB = 5dB

EIRP in dBm = +20 - 5 + 10 = 25 dBm

EIRP Formula

The following formula is used in the EIRP calculator above:

EIRP = TxP - L + Gt

Where:

• TxP = Transmitter Power (dBm)
• L = Losses (dB)
• Gt = Antenna Gain (dBi)

ERP Calculator

The calculator helps you calculate the ERP value.

Example (ERP calculation):

• Transmit power in dBm = +20dBm
• Antenna Gain, dBd = +7.85 dBd
• Cable Loss in dB = 5dB

ERP in dBm = +20 - 5 + 7.85 = 22.85 dBm

ERP Formula

The following ERP formula is utilized by the ERP calculator.

ERP = TxP - L + Gt

Where:

• TxP = Transmitter Power (dBm)
• L = Losses (dB)
• Gt = Antenna Gain (dBd)

import EIRPCalculator from ”./elements/EIRPCalculator.astro”; import ERP_Calculator from ”./elements/ERP_Calculator.astro”;