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Tsunami MP.11a Antenna Installation Guide
Figure 6. Clearance Factor Diagram
CALCULATIONS
Availability of the microwave path is a prediction of the percent of time that the link operates without
producing an excessive bit error rate (BER) due to multipath fading. In the absence of direct interference,
availability is affected by the following:
▪ Path length
▪ Fade margin
▪ Frequency
▪ Terrain (smooth, average, mountainous)
▪ Climate (dry, temperate, humid)
Depending upon the type of information carried over the link and the overall network design redundancy, you
may want to design for a specific availability rate. For example, if the data or voice traffic carried by the radio
is critical, the link can be designed for a very high availability rate (for example, 99.999% or 5.3 minutes of
predicted outage per year).
Availability can be improved by increasing the fade margin either by making the path shorter or by using the
higher gain antennas in conjunction with lower loss transmission line (using a higher quality transmission
line, shortening the length, or both).
Chapter 2. Determining Range and Clearance 20
CPN 65756B Issue Date: August 2003