NMX920 OEM Integrators Guide
Page 14 of 21
of uncertainty for this measurement is ± 16.2 % (Appendix C). The SAR limit given
in the FCC 96-326 safety guideline is 1.6 W/kg. This unit as tested, and as it will be
marketed, is found to be compliant with this requirement”
The complete SAR report is available on request from Nomadic Communications.
If the final integration uses a different antenna configuration, the entire system will
need to be re-evaluated for human exposure to RF radiation. Human exposure to
RF radiation is a very complex system issue. It is affected by parameters (but not
limited to) such as
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Antenna
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Power Supply
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Application
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Case
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Accessories
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Antenna placement.
If the complete system is operated in a fixed location, mobile application or
portable application with a unity gain (0 dBd) antenna and a guaranteed minimum
separation of at least 20 cm between the antenna and any body then the NMX920
can be used in the system without further evaluation.
If a higher gain antenna is used then Maximum Permissible Exposure guidelines
must be checked, and application possibly made for change in licence conditions.
If the NMX920 is to be used in a body worn application, or if a 20 cm separation
between antenna and body cannot be guaranteed by obstruction, then the entire
integrated system must be re-evaluated for SAR. SAR evaluation will need to be
done for all available options for the final systems – all different battery packs,
cases, antennas, power supplies, attached peripherals, after market accessories
etc.
7.3. Power Supply
The NMX920 firmware monitors it’s power supply. If the modem’s power supply
falls outside the specified operating limits, the transmitter will be disabled and the
DTE notified. MASC packets appropriate to power supply management are
