User Manual

ThingMagic Nano User Guide 14
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The output accuracy over temperature is typically +/- 0.75 dBm, with most variation occurring at lower
transmit output power levels.
Output Power Accuracy vs. Temperature
Receive Sensitivity
The receive sensitivity is influenced by both user-defined settings and by external environmental factors.
These factors are:
• Transmit Level
• Gen2 “M” setting
• Region of Operation
Receive sensitivity is strongly influenced by the amount of interference caused by the reader’s own transmit
signal. This interference can be reduced by reducing the transmit level. The receive sensitivity is quoted at
the highest transmit level (+27 dBm for the Nano), but 1 dB of sensitivity is typically gained for every dB that
the transmitter output level is reduced.
The Gen2 “M” setting influences how data is encoded when sent from the tag to the reader. Higher “M”
values send data at lower rates and are more noise immune, increasing the module’s sensitivity. Lower “M”
values send data at higher rates, decreasing the sensitivity somewhat.
The region of operation is also a factor. The Nano has slightly better receive sensitivity in the regions that
fall within the range of 865 to 868 MHz than in regions that fall within the range of 917 to 928 MHz.
The following table gives the sensitivity for region and “M” value at a transmit output level of +27 dBm.
Sensitivity for Region and “M” Value
Region “M” Value Sensitivity
North America and subsets of 917 to 928 MHz band
8 -57 dBm
4 -55 dBm
2 -45 dBm