User's Guide Part 2

User Guide: PTP 600 Series Deployment considerations
phn-0896_009v003
Feb 2010
UNDER DEVELOPMENT
8-9
Deployment considerations
When to use external antennas
The majority of radio links can be successfully deployed with the PTP 600 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.
Link budget
An estimate of the link budget for a specific application can be obtained by using the
Motorola LINKPlanner tool. For more information see the Motorola web site.