Deployment Considerations; Link Budget; Regulatory Issues With Connectorized Units - Motorola PTP 300 Series User Manual

10.3 Deployment Considerations

The majority of radio links can be successfully deployed with the PTP 300 Series. It should
only be necessary to use external antennas where the LINKPlanner indicates marginal
performance for a specific link – for example when the link is heavily obscured by dense
woodland on an NLOS link or extremely long LOS links (>80km or >50 miles) over water.
The external antennas can be either dual-polarization (as the integrated antenna) or two
single polarized antennas can be used in a spatially diverse configuration. It is expected that
the dual-polarization antennas would normally be used to simplify the installation process;
spatially diverse antennas may provide additional fade margin on very long LOS links where
there is evidence of correlation of the fading characteristics on Vertical and Horizontal
polarizations.

10.4 Link Budget

An estimate of the link budget for a specific application can be obtained by using the Motorola
Systems link estimation tools. For more information see the Motorola web site.

10.5 Regulatory Issues with Connectorized Units

Installations must conform to any applicable local regulations for the Equivalent Isotropic
Radiated Power (EIRP).
Ensuring compliance becomes more complex when the connectorized unit is used with
external antennas which may be locally sourced. With higher gain external antennas fitted,
the Maximum Transmit power may need to be reduced for operation in specific countries.
In some regions, operation of the PTP 300 products is constrained by EIRP limits. For more
information on these limits, see Section 4.2 "Licenses and Region Codes".
When operating with external antennas, the installer/operator has to set the maximum
transmit power to ensure that the EIRP limit is not exceeded. Use this formula:
Maximum Transmit Power Allowed = EIRP Limit – Antenna Gain + Cable Losses
Set the power to the 1dB value lower than the actual value calculated.
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