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 5 of 32
I. First is to build the individual elements. Each one is a Sigma-180 Mag num and they are
identical. Their function is determined later by which is selected for reflector and driver, then each
element’s tuning is set.
ELEMENT ASSEMBLY
_____1) NOTE: this entire antenna has already been assembled at the factory. This is how the
holes get drilled and how the subassemblies are made. This means that every piece will
align properly, provided that they are being assembled in the right position.
_____1a) It should never be necessary to drill a hole for a rivet, or bolt.
_____1b) Each element is disassembled and separately bundled, so working with one
element at a time is the best method. This will ensure that only the parts for a
particular element are available for assembly at one time.
_____1c) Please check the measurements and the element positions to double check us at
the factory. It is rare that a marking mistake is made, but it can happen.
___2) Each element is tapered and the taper runs smaller towards the tip. Each section slides into
another and to ensure a nice fit, the larger one is crimped/swaged to reduce its size slightly.
This means that one end of each section is crimped/swaged and the reduced size of one end
can be clearly seen. Only the tip is not done in this manner, since it is the end of the element.
_____2a) Please be sure that the non-crimped/swaged end goes into the crimped/swaged end of
the larger piece.
_____2b) If the rivet holes do not align, please check to be sure the section is oriented properly
and that the correct side (A or B) is on the correct side. It should not be necessary to
drill any holes.
_____2c) Thanks.
_____3)
Lay out the element assembly sections.
_____a) Side A & Side B
_____b) Note how the large Sigma coils are attached on each side of the center.
_____c) Please refer to the drawings and photos.
_____d) Be sure to slide the coil covers (tubes and caps) on before completing the assembly.
_____4)
Apply Noalox compound to each of the sections that will slip into another. This can be a
thin coat, spread evenly along and around the portion that is inserted into the larger tubing.
_____5)
Assemble both of the tips first.
_____a) Insert the supplied 1/8" rivets into all rivet holes. It is important to insert all the
rivets before any are pulled; otherwise, there is a possibility that the other holes
might not align properly. If at any time it becomes necessary to remove a rivet, use
an 1/8" drill and use the hole at the center of the rivet as the hole guide. Even if the
hole is enlarged, the closed-end rivets will fill in the hole when they are pulled.
_____b) Pull each rivet with the hand riveter. The mandrel of the rivet (the "shaft") is inserted
into the riveter and the handles of the riveter are squeezed. Sometimes, a complete
squeeze of the riveter will not "pop" the rivet and release the mandrel. If this occurs,
release the pressure on the riveter and push it back down over the mandrel (which
will now be sticking out farther).
_____c) Slip each section into the matching larger tubing, as in the prior step and secure with
the rivets.