User guide

1892 1139 - RSX Range of Intelligent Modems User Guide - v7.1 / Nov 2007 27
4Part Four: Additional Information
4.1 RANGE
The following table gives an indication of the typical ranges to be expected between a
transmitter and receiver that have simple end-fed dipole antennas.
The following assumptions have been made in the calculations:
line-of-sight between antennas
0dB gain for the transmitter and receiver antennas
0dB loss for connectors and cables between the antenna and the radio connector
20dB fade and environmental margin
-100dBm received signal strength, allowing for the GMSK modulation
Range versus TX power
Frequency (MHz) Power (mW) Power (dBm) Range (km) Range (miles)
RSX150G
173 1mW 0 1.7 1.1
173 10mW 10 4.4 2.7
173 100mW 20 13.8 8.6
173 500mW 27 30.9 19.2
RSXn50G
458.5 1mW 0 0.5 0.3
458.5 10mW 10 1.6 1.0
458.5 100mW 20 5.2 3.2
458.5 500mW 27 11.7 7.3
RSX850G
869 1mW 0 0.3 0.2
869 10mW 10 0.9 0.6
869 100mW 20 2.8 1.7
869 500mW 27 6.2 3.9