User's Manual

4 MHX 920 Operating Manual: Chapter 2 Configuration
2. Configuration
2.0 Overview
This chapter provides a detailed description of the various operating
parameters of the MHX-910A.
2.1 Output Power Level
The Output Power Level determines at what power the MHX-910A
transmits. The MHX-910A’s sensitive receiver can operate with very low
power levels, so it is recommended that the lowest power necessary is used;
using excessive power contributes to unnecessary “RF pollution”.
The allowable settings are:
0 1 mW
1 10 mW
*2 100 mW
3 1000 mW
Ideally, you should test the communications performance between units
starting from a low power level and working upward until the RSSI is
sufficiently high and a reliable link is established. The conditions will vary
widely between applications; the output power settings can be calculated
based on following information.
• Transmitter antenna gain
• Cable loss
• Effective radiated power (ERP) requirement by FCC Regulations
Power Setting = 36 – Antenna Gain – Cable Loss
The power setting must be no more than the above calculation value. Any
higher is a violation of FCC rules.