User Manual

MDR5800 User Manual
862-01881 Issue 6 Page 20
3 PLANNING
This chapter is aimed at management and planning staff to enable them to assess the
requirements for installing an MDR5800 digital radio link.
3.1 System Type Selection
The MDR5800 system uses an Outdoor Unit with a type-N RF output for connection
to a range of antennas.
The MDR5800 is aimed at FCC regulated markets.
Antenna polarisation can used to co-locate multiple MDR5800 systems.
Antenna polarisation can be used to overcome interference.
3.1.1 Antenna selection (MDR5800)
The antenna type must be selected before the MDR5800 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.
Table 3 MDR25800 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