User's Manual

i-CARD User’s Guide
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Document # 7007-0001, Rev B - 14 –
Appendix B: RF Output Power Calculation
The following is the licensed limit allowable by the appropriate regulatory bodies for
operation of IDENTEC SOLUTIONS’ RFID devices:
In North America, the approved frequency is 916.5 MHz. Our equipment is certified to
transmit an Effective Radiated Power (ERP) of 50mV/m @ 3m. This equates to
transmitting 0.75mW from the antenna, or –1.25 dBm.
In Europe, the approved frequency is 868.35 MHz. Our equipment is certified to
transmit an ERP of 5mW (6.99dBm) @ 3m.
To calculate the power being transmitted from the antenna, the following formula may
be applied:
Effective Radiated Power (ERP) = [i-CARD Output Setting] - [Cable/Connector Loss] +
[Antenna Gain]
The variables are defined as follows:
[i-CARD Output Setting] = User defined
[Cable/Connector Loss] = Variable, depending on the type of cable and connectors
being used. A typical installation may use RG-58 cable with a loss of 0.2 dBm/ft.
Typical connector loss is around 0.5dB per junction
[Antenna Gain] = –2.15 dBm for our standard PC i-CARD antenna: P/N 210265-001
NOTE: It is the responsibility of the installer to ensure that operation is within the
limits of the appropriate regulatory body where the equipment is being used.