SUMMARY
So far you have read how to perform the three main tasks to complete the antenna installation.
The first task was layout of the antenna site. The second task was assembly of the launcher and
antenna and the final task was raising the mast. You must understand the steps within each task
and be familiar with the location of each part of the antenna system. This knowledge will make
it possible for you and another man to erect the antenna system within the 10 minutes specified
by the TM.
j.
Lowering the Mast. After the antenna has served its purpose and must be moved to a
new site or the dipole must be changed for a different band, the mast must be lowered.
The two precautions mentioned earlier should still be followed. Keep your hands and
feet from under the lowest mast section and place at least one man to maintain adequate
tension on the windward upper guy if the wind is strong. The following steps are those
which you should follow while lowering the mast. Open and refer to the Fold-Outs
specified in each step.
STEP 1:
Refer to Fold-Out 7 while reading this step. Unlock the azimuth plate and use
the strap wrench to rotate the mast so that the yellow stripe on the mast and
the zero degree mark on the azimuth plate are at the front of the launcher.
STEP 2:
Loosen the upper guy wires by unlocking the snubber and releasing
approximately 6 inches of wire to allow some free vertical movement of the
mast. Locate the snubber in Fold-Out 7.
STEP 3:
Unpin the jacking lever from its stored position and pin it in the clevis on the
operating rod of the lower brake ring. These parts are shown in Fold-Out 7.
STEP 4:
Close Fold-Out 7 and open Fold-Out 6. Locate the items referred to while
you read this step. Set the brake control levers so that the arrows point
upward. With short strokes of the jacking lever, raise the mast until the joint
between the lowest and next lowest mast section is in line with the horizontal
yellow stripe on the launcher leg.
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