Wave Wireless Networking SC5800, Руководство пользователя, Страница: 21 / 108

SPEEDCOM SC5800 User Manual
19
3 PLANNING
This chapter is aimed at management and planning staff to enable them to assess
the requirements for installing an SC5800 digital radio link.
3.1 System Type Selection
!
The SC5800 system uses an Outdoor Unit with a type-N RF output for
connec tion to a range of antennas.
!
Antenna polarization can used to co-locate multiple SC5800 systems.
!
Antenna polarization can be used to overcome interference.
3.1.1 Antenna Selection (SC5800)
The antenna type must be selected before the SC5800 system is to be installed.
The chosen antenna must enable the system to operate with sufficient link fade
margin without excessive cost and allow the user’s ‘link availability requirements’ to
be met.
The main consideration when selecting an antenna is antenna gain measured in dBi.
A path loss analysis is highly recommended to determine the antenna gain needed
for adequate fade margin. The table below shows antenna selection guidelines for
some configurations. The distances are calculated for a 20 dB link fade margin.
Ta ble 3 SC25800 Antenna Selection
Antenna Type Gain
(dBi)
Distance (Km) Power level
(dBm)
0.15 m Flat panel 18 9 24
0.3 m Flat panel 24 30 24
0.6 m Flat panel 28 80 24