Appendix A: Planning Your Wireless Link
74
Version 1.0 Rev B - 08/00
Working with System Gain
The system gain of a radio system is the difference between the transmitted power and a
receiver s sensitivity threshold. The system gain of the Hopper Plus 120-24 is:
Formula:
System Gain = Transmission Power - Receiver Sensitivity @ 10
-6
BER
Variables:
Hopper Plus 120-24
Tx Power
=
18.5 dBm
Receiver Sensitivity =
- 83 dBm (receiver sensitivity @ 10
-6
BER)
Calculation:
Hopper Plus 120-24
18.5 dBm - (-83) dBm = - 101.5 dB
More info:
To ensure reliable communications, the system gain plus all antenna
gains must be greater than the sum of all losses. For a reliable link,
Wi-LAN recommends that the system gain plus all antenna gains be
greater than the sum of all losses by a factor of 15 dB. This factor is
known as the fade margin.
