Motorola PTP 400 Series Manual De Usuario

 

 

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13.4 Deployment 

Considerations 

The majority of radio links can be successfully deployed with the PTP 400 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 

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 Table 7 in section 5.2 “Region Codes” for any EIRP restrictions that may apply in your 

region.  

13.6.1  Antenna Choice (5.8GHz FCC Regions Only) 

The antennas which can be deployed with the Connectorized version of the PTP 400 Series 

bridge are shown in Table 20.