User Manual

Kapsch TrafficCom AG
Page 50 of 58 Installation Manual | SRU-8100 RFID Reader 18000-63
Doc No. 47000001169 | Version 01 | 2014-11-03 | released
47000001169-Ins-01
The following applies to the European region, Reader type “EU”:
PReader Transmission power of the reader in dBm
PERP Transmission power based on a half-wave dipole in dBm
DKabel Cable attenuation in dB
GHW Antenna gain based on a half-wave dipole
The cable attenuation is the length-dependent attenuation of the cable at the used frequency:
DKabel Cable attenuation in dB
I Length in m
DdB/m Attenuation in dB/m at specific frequency
The antenna gain is stated in various different units. These units include dBi and dBic. The units dBi and
dBic refer to an isotropic (spherical) radiator, where dBic refers to a circularly polarized isotropic radiator and
dBi to a linearly polarized isotropic radiator.
In the European regulation area, the radiated power must not exceed 2 W ERP. This figure refers to a half-
wave dipole. Please see the equation below, showing the relationship between an isotropic radiator (dBi)
and a half-wave dipole.
GHW Gain based on a half-wave dipole
Gisot Gain based on an isotropic radiator in dBi
The transmission power for the European variant can be set in 0.25-dB steps from 20 dBm to 33 dBm.