User Manual

Kapsch TrafficCom AG
Installation Manual | SRU-8100 RFID Reader 18000-63
Doc No. 47000001169 | Version 01 | 2014-11-03 | released
Page 51 of 58
If the gain of the antenna is referred to the polarization of a circular isotropic antenna (dBic), the linear gain of
the antenna is 3 dB lower.
GHW Gain based on a half-wave dipole
Gisot Gain based on an isotropic radiator in dBic
The following applies to the US region, Reader type “US”:
In the FCC approval region, the RF power connected at the antenna input must not exceed 1 W. If the gain
of the antenna is higher than 6 dBi, the RF power connected must be reduced correspondingly. The reader's
transmission power is then:
PReader Transmission power of the reader in dBm
P
cond Power on antenna output in dBm
D
Kabel Cable attenuation in dBm
G
HW Antenna gain in dBi
Note: The antenna gain must be stated in dBic.
The RFID reader's transmission power can be set separately for each antenna or all antennas at the same
time. If the All antennas same power check box is set, the sliders for the other antennas are set to the
same power when a slider for the power for antenna 1-4 is adjusted. If this check box is not selected, the
power at the antennas can be set separately for each output.
Pre-defined antennas can be selected in the Antenna type selection drop-down menu. This selection sets the
antenna gain in the program, and limits the transmission power to the maximum value permitted for this
antenna. If Custom antenna is selected, the gain and power can be freely set.