Quick Start Guide

Designed for Operators, by Operators
13 | P a g e
As indicated in Table 3, the average Tx power output at each Base Station antenna connector is 33dBm.
The average EIRP per antenna is computed as follows:
Ave EIRP per Ant (in dBm) = Ave Tx Pwr per Ant + Ant Gain – Cable and Connector Loss
For example, if deployed with a 15dBi antenna connected to the Base Station with only a few feet of
cable, the average EIRP per Antenna might be 33dBm + 15dBi – 1dB = 47dBm.
The total average EIRP of the Base Station with all antennas combined can then be computed as follows:
Total Ave EIRP (in dBm) = Ave EIRP per Ant + 10log (Number of Antennas)
For a 6 antenna Base Station, the example above yields Total Ave EIRP = 47dBm + 7.78dB = 54.78dBm.
Note that some regulations refer to peak power, which in a WiMAX system is normally as much as
10dB higher than average power. In the case of the Mercury Quantum products the peak power can
be assumed to be 9dB higher than average. Therefore, Peak EIRP should be computed as follows:
Peak EIRP per Ant (in dBm) = Ave EIRP per Ant + 9dB
Total Peak EIRP (in dBm) = Total Ave EIRP + 9dB
For the above example, Peak EIRP per Ant = 46dBm + 9dB = 54dBm and Total Peak EIRP = 53.78dBm
+ 9dB = 62.78dBm. These equations are summarized in Table 5.
EIRP Metric
Formula
Ave EIRP per Ant (in dBm)
= Ave Tx Pwr per Ant + Ant Gain – Cable and Connector Loss
Total Ave EIRP (in dBm
= Ave EIRP per Ant + 10log(Number of Antennas)
Peak EIRP (in dBm)
= Ave EIRP per Ant + 9dB
Total Peak EIRP (in dBm)
= Total Ave EIRP + 9dB
Table 5 EIRP Calculations
Note that some regulations are specified for particular channel bandwidths and/or
antenna beamwidth and in such cases the allowable power should be scaled
accordingly. As with the previous calculations, each case is often unique. Although the
PureView NMS provides guidance and limits where known regional regulations apply, it
is ultimately the responsibility of the spectrum holder to assure that appropriate limits
are set.