Force 12 Sigma-280 Magnum, Руководство по сборке

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DW-Manual-Sigma-280 Magnum-001 FORCE 12 SIGMA-280Magnum Assembly Instructions Page 6 of 32
_____6) Assemble both of the T-bars
_____a) Using the similar technique as above, rivet each T-bar together.
_____7)
Assemble the center section of the antenna.
_____a) Refer to the drawing and photos.
_____b) Be sure to add the coil cover caps and coil cover tubes before completing the
element; otherwise, the element will have to be disassembled.
_____c) Be sure to slide the PVC insulators on the center sections.
_____1. Locate the two (2) PVC center insulators and place them over the center
portions of each element half so that each insulator is to the outside of the 10/24
machine screws used at the feed point.
_____2. The U-bolts that will be holding the element to the mounting plate are
insulated from everything by the PVC insulators.
_____d) Double check that:
_____1. the two coil cover caps are on the inside of the coils (one per side).
_____2. the covers are on each element half, to the outside of the coils.
_____3. the two coil covers for the tip ends of the covers are on the element to the tip
ends of the antenna.
_____e) Using a 1/8” or 3/16” drill bit, drill four (4) holes along a straight line on each of the
cover tubes. Start the holes about 2” in from each end of the two (2) cover tubes.
These will be the drain holes. They can be drilled later, but now is a better time.
_____f) Spread the turns on the coils for about one (1) turn per inch, or about one tubing
diameter spacing between turns.
_____f) Temporarily attach the far end (T-bar end) of each coil to the element using a 2” U-
bolt and saddle.
_____8) Complete assembly of the element
_____a) Add the remainder of the larger diameter tubing using ¼ - 20 stainless bolts and ny-
loc nuts.
_____b) Add the T-bars to the brackets using the small U-bolts and hardware.
_____c) Do not over tighten the nuts, as it is not necessary to compress the tubing.
_____d) Add the non-conductive truss line to the eye-bolts on the element. These are simply
tied to the element and the center is later clamped to the mast. Set the slack for an
attachment above the element of about 2-3’
_____9)
Double check that both sides "A" and "B" have been fully assembled.
_____a) Double check that the element looks like the drawings and pictures.
_____10)
The element is always installed with the rivets pointing down. This will prevent any water
from sitting in the rivets, although there is no hole actually going through them.
_____11)
The element mounting plate is attached next.
_____12)
If not already done, remove the saddles from two (2) of the 2” U-bolt/saddle assemblies.
_____a) Do not use the saddles.
_____b) Place the 2 U-bolts over the PVC insulators and secure to the mounting plate with `
nuts and lock washers.