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Calculating Path Loss & Receive Power

This page was set-up for those needing to perform rough calculations on radio wave propagation. This worksheet uses the Friis free space propagation loss equation to calculate the path loss between the transmitter and receiver. Enter each of the parameters, then press the "Calculate" button at the bottom of the page.

Transmit antenna gain:

dBi

ratio


Signal frequency:

GHz

MHz

kHz

Hz


Transmit power:

dBm

W (watts)

mW (milliwatts)

dBW


Distance between the transmitter and receiver:

meters

feet

kilometers

miles

yards


Cable loss: dB


Preamp noise:

figure (dB)

factor (ratio)

temp(oK)


Preamp gain:

dB

ratio


Cable loss: dB


Receiver noise:

figure (dB)

factor (ratio)

temp(oK)


Receiver BW:

GHz

MHz

kHz

Hz


Receive antenna gain:

dBi

ratio


Antenna noise: oK


Desired units for power: dBm W (watts) mW (milliwatts) dBW