Quatech WLNG-SP-DP500 Series Especificaciones descargar pdf (Pagina 30)

Quatech, Inc. Airborne Enterprise Module Databook

30 8/11/2009 100-8080-110

Link Margin provides a measure of all the parts of the RF path that impact the

ability of two systems to communicate. The basic equation looks like this:

EIRP (dB) = TxP + TxA – TxC

Link Margin (dB) = EIRP – FPL + (RxS + RxA – RxC)

Where: TxP = Transmitter output power (dBm)

TxA = Transmitter antenna gain (dBi)

TxC = Transmitter to Antenna coax cable loss (dB)

FPL = Free Path Loss (dB)

RxS = Receiver receive sensitivity (dBm)

RxA = Receiver antenna gain (dBi)

RxC = Receiver to Antenna coax cable loss (dB)

This is a complex subject and requires more information than is presented here,

Quatech recommends at reviewing the subject and evaluating any system at a

basic level.

It is then possible, with a combination of the above items and an understanding

of the application demands, to achieve a link quality optimized for the application

and host design. It is important to note that this is established with a combination

of hardware selection, design choices and configuration of the radio.

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Quatech WLNG-SP-DP500 Series Especificaciones Pagina 30