DW-Manual-Sigma-280 Magnum-001 FORCE 12 SIGMA-280Magnum Assembly Instructions Page 7 of 32
_____13)
With the nuts still loose on the U-bolts, align the element with:
_____a)
The T-bars horizontal
_____b)
The rivets on the element are pointing downward
_____c)
The 10-24 feed point screws are in the correct orientation to connect to the balun /
hairpin or the optional relay box, about a 45 degree angle.
_____c1)
Double check that the 10-24 feed point screws are tight (underneath the flat
washers).
_____c2)
When the element mounts are attached to the boom, the feed point screws
should point towards the center of the boom (towards the mast).
_____d)
The slots in the PVC insulators are in the air gap.
_____14)
Now the nuts to hold the element can be tightened. It is only necessary to tighten them until
the element does not rotate with hand pressure, then about a half-turn more.
_____a)
Double check that the split lock washers under the nuts are compressed.
_____15)
Locate the element truss line. There are two pieces per element (one for each side/half).
_____a)
If the eye-bolts are not already installed in the riser on each element mount, slide one
in from each side so that there is a loop (the eye) on each side of the riser.
_____16)
Attach the center of each line to the element and run the free ends back to the center riser.
_____a)
Attach each end to one of the loops, leveling the element as the line is tightened.
_____b)
It is not necessary to bow the element upward (“gull wing” style).
_____c)
Secure the lines at the center riser/eye-bolt.
_____17)
Repeat the above procedure for the other element.
II.
BOOM ASSEMBLY.
_____1)
Locate all the boom sections and match up the joints (each one is engraved).
_____2)
Insert the boom bolts from the top of the boom at the joints, install and tighten the nuts.
_____3)
Locate the boom truss and install it in the appropriate holes. It will be held to the mast using
a single U-bolt and saddle.
_____4)
Attach the elements to the boom ends.
_____a)
The mounting bolts are run from the inside-out.
_____b)
Start with the back bolts (farthest inside the boom).
_____c)
Slide the bolt through the boom, then through the element mounting bracket
and add the split lock washer and nut, but do not tighten fully yet
_____d)
After all the bolts are in and the nuts are started, tighten all the nuts.
Summary of Contents for Sigma-280 Magnum
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