User Manual

_________________________________________________________________________
Document #7201-002, Rev C Page 29
5.0 Appendix A - Effective Radiated Power Calculation
The following is the licensed limit allowable by the appropriate regulatory bodies for
operation of IDENTEC’s RFID devices:
i-Q Operation
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.
To calculate the power being transmitted from the antenna, the following formula may be
applied:
Effective Radiated Power (ERP) = [Output Setting] - [Cable/Connector Loss] + [Antenna
Gain]
The variables are defined as follows:
[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 0.2dB per junction;
[Antenna Gain] = 5 dBm for our antenna PN 210270-001.
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.