User's Manual

RFD900ux Data Sheet
www.rfdesign.com.au
6
Last update 12/09/2019
4 Output power levels
Many countries have different legal power levels. Be sure to operate within the legal power limits of
the country that you are operating in. The RFD900ux modem can support the power levels between
0dBm and 30dBm in 1dBm steps. Formula 2-1 can be used to convert the power in dBm into milliwatts.
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Formula 2-1
To calculate Effective Isotropic Radiated Power (EIRP) you can use the formula 2-2 below:
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Formula 2-2
The FCC limit for EIRP is 4 Watts, or 36dBm for frequency hopping radios in the ISM 900 MHz band.
The Australian EIRP limit is 30dBm as defined by ACMA.