User's Guide Part 2

Regulatory issues with connectorized units Chapter 8 Connectorized PTP 600 series
phn-0896_009v003
8-10
UNDER DEVELOPMENT
Feb 2010
Regulatory issues with connectorized units
Maximum EIRP
Normal EIRP limits
In most regions (including USA, Canada, Europe and Australia) operation of products
in the band 5470 MHz to 5725 MHz is constrained by an EIRP limit. The constraint is
that the EIRP must not exceed (17 + 10 x Log Bandwidth) dBm.
In some regions (including Europe) operation of products in the band 5725 MHz to
5850/5875 MHz is constrained by an EIRP limit. The constraint is that the EIRP must
not exceed (23 + 10 x Log Bandwidth) dBm.
As the PTP 600 has an operating bandwidth from approximately 5 MHz to
approximately 30 MHz, then the maximum allowed EIRP depends on the operating
bandwidth of the radio as shown in Table 8-1.
Table 8-1 No
rmal EIRP limits with operating channel bandwidth
Operating bandwidth
(MHz)
Allowed EIRP (dBm) at
5.4 GHz
Allowed EIRP (dBm) at
5.8 GHz
5 24
30
10 27
33
15 28.8
34.8
30 30
36
Calculating EIRP
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)