MOUNTING AND ASSEMBLING THE 30m/40m DRIVEN ELEMENT (49’) TRUSS
37
2112 116TH AVE NE SUITE 1-5, BELLEVUE WA, 98004
WWW.STEPPIR.COM
TEL: (425)-453-1910 FAX: (425)-462-4415
Secure the truss support, saddles and turnbuckles as shown in
figure 4.2.
The truss support must be mounted on on the
opposite
side of the boom from the mast plate.
Position the truss support so it is perpendicular to the EHU mounting plates. This is not critical as
long as you get it reasonably close.
Unscrew the SS nut from 3/16” eye bolt and discard. You will use the small SS washers so be
sure to keep them for this assembly. Secure the eye bolt to the coupler on the 30m/40m sweep
as per
figure 4.3.
Lengthen the turnbuckles until the threads are approximately half way out. To attach the loose
end of the long Dacron rope you will need to run the rope through the open eye of the turnbuck-
le. Attach a separate Dacron line to each of the 3/16” stainless steel eyebolts mounted on the
sweep. The amount of tension on the truss rope will vary, depending on your own personal pref-
erence. Therefore, we recommend you do not cut the Dacron rope until you are certain you have
the truss tension at a point you are comfortable with.
Pull the rope tight enough so that the telescoping poles are close to level.
Once the 30m/40m loop is close to level secure the rope to the turnbuckle by looping the rope
twice through the eye and tying 3 half hitches. Finish the knot by covering the half hitches with
the provided electrical tape.
Use the turnbuckles to do any fine tune adjusting to your element.
DO NOT
pull up too high on
the 30m/40m element. This will cause the element to collect water and damage the antenna.
The tip of the sweep should never be higher then any other part of the telescoping pole.
Do not attempt to try to get the element perfectly straight, if you pull it up just enough so that it
is close to the droop of the 20m element it will look great. Lock down the turnbuckle by tighten-
ing the small nuts on the turnbuckle. Be sure to safety wire each turnbuckle, so that they cannot
turn and come loose.
Repeat steps 6-12 to complete the other half of the truss support.
Figure 4.1
for complete lay-
out of 49’ driven element with truss.
Figure 4.1
Truss Layout
