OBID
i-
scan
®
UHF
Installation
ID ISC.LRU1002
FEIG ELECTRONIC GmbH
Page 21 of 29
M31010-1e-ID-B.docx
5.3. Reader Power adjustment
To achieve the optimum reading performance it is necessary to set the reader output power to the
highest allowed value. This depends on the used reader type (EU / FCC) and the regulation in the
country were the reader is used.
5.3.1. EU-Reader according to EN302 208
According to the standard EN302 208 the maximum radiated power is 2 W e.r.p. (Effective Radiat-
ed Power) in countries of the European Union. The in the reader configured output power P
out
de-
pends on the antenna gain in dBi and the attenuation of the antenna cable. If a circular polarized
antenna is used the antenna gain [dBic] can be reduced by 3dB. At a linear polarized antenna the
maximum linear antenna gain [dBi] must be used.
P
Out
= P
erp
- Antenna Gain + Cable loss + 2,1dB**
** Correction Factor to convert the radiated power from e.r.p to e.i.r.p.
For the calculation of the reader output power P
Out
an Excel file „Calc-RF-Power.xls“ can be used.
Available from Feig Electronic GmbH.
Example:
** linear antenna = „0“, circular antenna = „1“
Figure 17: Calculation of the output power
In Figure 17 the allowed antenna power is shown for the use of the FEIG standard antenna
ANT.U600/270
–EU and a 6m long Belden H155 coaxial cable.
