Motorola PTP 600 series User Manual page 265

User Guide: PTP 600 Series
Calculating EIRP for connectorized units
When operating with external antennas, the installer or operator has to set the
maximum transmit power to ensure that the EIRP limit is not exceeded. The EIRP may
be calculated from:
Allowed EIRP(dBm) =
Max_Transmit_Power (dBm) + Antenna Gain (dBi) – Feeder Losses (dB)
and hence:
Max_Transmit_Power (dBm) =
Allowed EIRP(dBm) – Antenna Gain (dBi) + Feeder Losses (dB)
The Set_Max_Transmit_Power parameter for connectorized units
As the actual maximum transmit power can only be adjusted in 1 dB steps, then the
installer or operator must configure the PTP 54600 or PTP 58600 to have a
Set_Max_Transmit_Power parameter as calculated below:
Set_Max_Transmit_Power = [Max_Transmit_Power] rounded down to nearest
lower dB step
In order to simplify matters, the settings to be used for regions with the EIRP limits in
Table 4-77
phn-0896_012v000
Jul 2010
4Gon www.4Gon.co.uk info@4gon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299
(assuming short feeder cables) are shown in
Electromagnetic compliance
Table 4-78.
4-95