Motorola Motorola PTP 250, User Manual, Page: 68 / 236

Link planning Chapter 2 Planning considerations
phn-2182_002v000
2-10
May 2011
When to install connectorized units
The majority of radio links can be successfully deployed with the integrated PTP 250.
However the integrated units may not be sufficient in some areas, for example:
x
Where the path is heavily obscured by dense woodland on an NLOS link.
x
Where long LOS links (>23 km or >14 miles) are required.
x
Where there are known to be high levels of interference.
PTP LINKPlanner can be used to identify these areas of marginal performance.
In these areas, connectorized ODUs and external antennas should be used.
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.