User Manual

Reader RF Power
54
Reader RF Power
During initial installation, the reader must be properly configured to use the correct RF power to
comply with FCC regulations. DO NOT increase the power beyond this level.
The maximum RF power is determined from antenna gain and antenna cable loss using the
formula:
P
max
= 36 dBm - Antenna Gain + Cable Loss
For example, if the antenna has a maximum gain of 6 dBi, and the cable has a minimum loss of
0.6 dB, the maximum RF power that may be set is (36- 6 + 0.6) = 30.6 dBm.
Reader RF Power Example
Using ThingMagic shielded 25 ft. coaxial antenna cables TM-M5CAB-TT-P25 type LMR-195
and ThingMagic Dual Antenna TM-ANT-NA-2CX.
Total 25 ft. cable insertion loss = 3.1 dB.
Antenna gain = 7.0 dB
P
max
= 36 dBm - 7.0 dB + 3.1 dB = 32.1 dB maximum reader RF power.
Cable Loss Values for Shielded Coaxial Cable Provided by ThingMagic
The Reader RF Power is set through the Settings Page
. Note that in no case may the power be
set higher than 32.5 dBm.
Note
Be sure to read the section Compliance, Warranty and IP Notices on page 66 to
maintain compliance with FCC regulations.
Cable Length (in ft.) Insertion Loss (in dB)
6.9
20 2.5
25 3.1