Campbell Scientific UT20 and UT30 Tower-based Weather Stations - Manual (Page 20)

UT20 and UT30 Tower-based Weather Stations
ground, lay out the two remaining anchor locations 10 feet from the first
anchor to the scribed line on either side of the base stake.
FIGURE 7-2. Guy anchor locations
On unlevel ground, use a compass at the base stake to lay out the remaining
two anchor locations 120 degrees from the first. Vary the distance between the
tower and each anchor so that the angle between the tower and the guy wire
will be approximately 30 degrees.
7.1.2 Tower Base Installation
There are two base options: the B18 base is poured in concrete; the RFM18
roof mount base is anchored to a flat surface.
7.1.2.1 B18 Base Installation
1. Dig a hole 36 inches square and 48 inches deep. Lighter soils will require
a deeper hole.
2. Assemble the J-bolt template as shown in FIGURE 7-3. Begin by
threading two 5/8-inch nuts onto each J-bolt, followed by a 5/8-inch
washer. Next, place a template piece over the J-bolt, followed by another
5/8-inch washer and a 5/8-inch split lock washer. Thread a third 5/8-inch
nut onto the J-bolt just until the bolt is even with the top of the bolt. Once
all three J-bolts are assembled, slide them together as shown in FIGURE
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