Motorola MOTOWI 4 PTP 600 Series, Руководство пользователя системы

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13.4 Deployment Considerations
The majority of radio links can be successfully deployed with the 600 Series bridge. It should
only be necessary to use external antennas where the Link Budget Calculator 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.
Dual polarization antennas (with a gain greater than the integrated antenna) are currently only
available in parabolic dish form.
13.5 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.
13.6 Regulatory Issues
In countries where FCC regulations are not relevant, installations should 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.
See
1198H
Table 6 in Section
1199H
5.3 for any EIRP restrictions that may apply in your region.
13.6.1 Antenna Choice (FCC Regions Only)
The antennas which can be deployed with the Connectorized 600 Series Bridge are shown in
1200H
Table 25.