Instruction Manual

Reader RF Power
Astra User Guide 58
Reader RF Power
If you are using an external antenna during initial installation, you must properly configure
to use the correct RF power to comply with FCC regulations. The software limit does not
allow the power to be set higher than 30.0 dBm. Therefore this particular antenna
configuration will comply with FCC regulations.
For the external antenna, the maximum RF power for compliance is determined from
antenna gain and antenna cable loss using the following formula:
Pmax = 36 dBm - Antenna Gain + Cable Loss
Reader RF Power Example
The antenna provided by ThingMagic that is listed in Appendix A: Astra Antenna
Information has the following features:
 Antenna that has a maximum gain of 6 dBi
 Cable that has a loss of 0.6 dB
Using the formula listed above, you have the maximum RF power is (36- 6 + 0.6) = 30.6
dBm. For more information about setting the RF power, refer to Setting the Reader RF
Power.
Note
Be sure to read Compliance, Warranty, and IP Notices
to maintain compliance with
FCC regulations.