Limitless™ WPMM Series
Issue 2
50051864
Honeywell Sensing and Control
9
2.8.2
For more information about the R&TTE Directive
The following website contains additional information about the Radio and Telecommunications Terminal Equipment
(R&TTE) directive:
3
EQUIVALENT ISOTROPICALLY RADIATED POWER (EIRP)
In radio communication systems, Equivalent Isotropically Radiated Power (EIRP) or, alternatively, Effective Isotropic
Radiated Power, is the amount of power that would have to be emitted by an isotropic antenna (that evenly
distributes power in all directions and is a theoretical construct) to produce the peak power density observed in the
direction of maximum antenna gain. EIRP can take into account the losses in transmission line and connectors and
includes the gain of the antenna. The EIRP is often stated in terms of decibels over a reference power level that
would be the power emitted by an isotropic radiator with equivalent signal strength. The EIRP allows making
comparisons between different emitters regardless of type, size or form. From the EIRP, and with knowledge of a
real antenna's gain, it is possible to calculate real power and field strength values.
Values found in Tables 11 and 12.
EIRP (dBm) = Max. Radio Output Power (dBm) – Cable/Connector Loss (dB) + Antenna Gain (dBi)
EIRP Example for WPMM Series:
5.5 dBi Omni remote antenna used in
ETSI/European Countries including France restriction
EIRP = 8 dBm – 4.28 dB + 5.5 dBi
EIRP = 9.22 dBm (value is less than the max. EIRP allowed of 10.00 dBm)
Antenna gain is expressed relative to a (theoretical) isotropic reference antenna (dBi).
