Cambium Networks cnReach N500 Handleiding (253 Pagina's)

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cnReach N500 User Guide

Tasks and Best Practices

phn-4673_002v000 (March 2018)

4-26

Transmission Systems

Cambium Networks recommends the use of a DC Grounded Transmission System featuring;

– DC Grounded Antenna from a reputable manufacturer with desired frequency range,

gain, beam pattern (coverage) and an input surge impedance of 50 ohms.

– DC Block Surge Suppressor; Polyphaser TSX-NFF or IS-B50LN-C2.

Losses within the Transmission System

The decibel is a logarithmic unit with the following net effects on signal loss;

- 1dB loss = 21% signal loss

- 2dB loss = 37% signal loss

- 3dB loss = 50% signal loss

- 6dB loss = 75% signal loss

- 10dB loss = 90% signal loss

When modelling the transmission system in your planning software, such as LINKPlanner, the insertion

loss from the connectors & surge suppressor should be combined with the loss from any planned strain

relief jumper cables in addition to the loss from the coaxial transmission line. LINKPlanner takes drop

cable and jumper cables into account when using the Cambium antennas with installation kits.

The following Cable Loss Calculators can be used to calculate the Cable Loss for the main transmission

line.

– Times Microwave Cable Loss Calculator

– Use the “Cable Run Attenuation” value, since the connector losses are included in the

table below.

Belden/Andrew Cable Loss Calculator

Use the “Matched Loss” value with SWR left at 1:1.

Calculating Transmission System Loss

Refer to the table to obtain the Connector & Jumper Loss for the frequency you intend to use;

LINKPlanner also provides for cable loss by selecting cable type and cable drop length.

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