System Characteristics
Receiver Sensitivity
The minimum RF signal power level required at the input of a receiver for certain performance (e.g. BER).
EIRP (Effective Isotropic Radiated Power)
The antenna transmitted power. Equal to the transmitted output power minus cable loss plus the transmitting antenna gain.
Pout - Output power transmitted in dBm
Ct - Transmitter cable attenuation in dB
Gt - Transmitting antenna gain in dBi
Gr - Receiving antenna gain in dBi
Pl - Path loss in dB
Cr - Receiver cable attenuation in dB
Si - Received power level at receiver input in dBm
Ps - Receiver sensitivity in dBm
Si = Pout - Ct + Gt - Pl + Gr - Cr
EIRP = Pout - Ct + Gt
Example:
Link Parameters :
Frequency: 2.4 GHz
Pout = 4 dBm (2.5 mW)
Tx and Rx cable length (Ct and Cr) = 10 m. cable type RG214 (0.6 dB/meter) Tx and Rx antenna gain (Gt and Gr) = 18 dBi
Distance between sites = 3 Km Receiver sensitivity (Ps) =
61
