Examples
Outdoor Antenna Installation Guide
3-15
Calculate the Cable effect on Range
3
On page page 3-13 we presumed that at both sites the antenna
were connected via 6m.(15 ft.) cables.
If we would replace the 6m.(15 ft.) cable at building
b
, with a longer
22 m. (75 ft.) cable, we would need to look at the Cable Factor
effect of this longer cable.
1.
Table 3-3 on page 3-8 tells us that this new cabling
combination is marked as cable combination
B
.
2.
Looking at the Cable Factor Diagram pictured in Figure 3-1 on
page 3-9, we see that the Cable Factor of cable combination B
equals a value of 82%.
3.
If we apply this Cable Factor to the range calculation formula
again, your probable range would become:
Range= 7.9 Km.(4.8 mi.) x 62% x 82% = 4.0 Km (2.5 mi.)
This result indicates that the effect of this cable will most likely
prevent your wireless link from operating at both High and Medium
Speed. In such situations you are advised to:
■
Relocate the WavePOINT-II hardware to a location that allows
you to use a shorter cable length.
■
Increase the height of the antenna on the mast and/or install
taller antenna masts to increase the signal path clearance.
■
Trade-off data speed versus range, and recalculate the ranges
that could be achieved at lower Transmit Rates.
Alternatively, you may decide to perform on-site diagnostic
measurements to validate the results of this calculation. Please
consult the WaveMANAGER/OR User’s Guide for information
about using the Wireless Link Test feature to perform on-site
diagnostic measurements.
The WaveMANAGER/OR User’s Guide is available in electronic
format on the WaveACCESS Office Router CD-ROM.
