Multitech MultiConnect xDot MTXDOT Series, Developer'S Manual

Page: 27 / 67

SPECIFICATIONS AND PIN INFORMATION
MultiConnect
®
xDot
TM
MTXDOT Developer Guide 27
The following table provides example settings and the theoretical maximum range based on these settings.
Example 18dB Transmit Power for
915 MHz Models Units Example 14dB Transmit Power for
868MHz Models
Frequency 915 MHz 868
TX Power 19 dBm 14
TX Antenna Gain 3 dB 3
RX Sensitivity
1
-120 dBm -120
RX Antenna Gain 3 dB 3
Fade Margin
2
30 dB 30
Distance 8.14 Miles 5.41
Distance 13.08 Km 8.70
1
RX Sensitivity is set to a conservative -120dBm, but can vary from -117 to -137dBm.
2
Fade Margin is set at the worst case of 30dB. Fade margin is an allowance a system designer includes to account
for unknown variables. The higher the fade margin, the better the overall link quality will be. With a fade margin
set to zero, the link budget is still valid, but only in LOS conditions, which is not practical for most designs. The
amount of fade margin to include in a calculation depends on the environment in which you will deploy the
system. A fade margin of 12 dBm is good, but a better number would be 20 to 30 dBm.