Leica mojoRTK How-To Manual page 5

Figure 2 – mojoRTK base radio antenna on the ground and elevated
Note: it is possible to have too much clearance as the radio reflections in
the second Fresnel zone interfere with each other in a way which reduces
the signal at the receiver. However, when setting up the base radio on a
tower it is unlikely that you will get the base antenna high enough to suffer
this problem.
Table 1 shows a list of antenna heights for 40% and 0% obstructions of
the first Fresnel zone over different distances between the mojoRTK base
station and the console.
It is likely that you won't have a choice as to how high you can mount your
base antenna on an existing tower. Use the table below to work out if your
antenna height will be below the height for 40% obstruction or above the
0% obstruction height. It would be better to be above the 0% height than
below the 40% height but going above the 0% height will introduce more
of the disruptive reflections off the ground. This may be somewhat
complicated by the fact that you have to work these numbers out over a
range of distances and further complicated again because this table is for
flat terrain only.
In any case, Table 1 has been provided help make informed decisions and
for problem diagnosis.
For more information
www.mojoRTK.com
Page 5/9 Document #1060 rev1.0