l
Installation of Rotator and Antenna on Tower
The procedure for installing the rotator depends on the type of tower used. The following instruc-
tions are generally applicable to most guyed, crank-up, or roof towers.
1. Attach the rotator to the tower’s rotator mounting plate, using the supplied M8X16 bolts and
spring washers. It is recommended that the tips of the bolts be lightly dipped in lubricating grease,
to ease disassembly in the future.
2. If a thrust bearing (such as the optional Yaesu model GS-065) is to be utilized, mount it on the top
of the tower (see Figure 4) using the supplied hardware.
3. Using a “gin pole” or other raising fixture, insert the antenna mast through the bearing from
above, and set the mast in the rotator’s mast clamps. Do not tighten the mast clamps at this time;
just secure the U-bolts to the point where the mast is held in place, but is allowed to rotate freely.
4. Partly tighten the thrust bearing’s mast bolts, so as to center the mast in the thrust bearing. When
you are satisfied that the mast is centered, back off slightly on each of the thrust bearing’s mast
bolts, and (if possible) lift the mast by a
very small amount
(approximately 5 mm or 3/16”), just
enough to lift the bottom of the mast slightly off the top of the rotator. Now re-tighten the thrust
bearing’s mast bolts to secure the mast in place. This procedure takes all the weight of the mast
and antennas off of the rotator; all weight is being carried by the thrust bearing. If no thrust
bearing is used, the mast should be allowed to rest on the top of the rotator.
5. Verify that the mast rotates freely in the mast clamps, and that the mast is properly centered in the
clamps. Now tighten the nuts on the U-bolts of the mast clamp.
Do not over-tighten the nuts on the mast clamps. They should be tightened until the
spring washer becomes flat, then tightened further by ½ to one turn maximum.
6. Install the rotator control cable’s round plug into the jack on the side of the rotator’s base, and
tighten the connector ring to secure the connector. Slide the rubber boot over the connector; while
putting a slight amount of inward pressure on the rubber boot, use electrical tape to secure the
back end of the rubber boot to the cable. This slight inward pressure on the rubber boot will
enhance the weatherproofing of the installation. Secure the control cable to the tower in several
places, using electrical tape and/or UV-resistant cable ties.
7. Install the antenna(s) on the mast. Use a compass to align the forward end of the beam toward
North (0º)
or whichever direction to which you set the “Left Stop” in Step 12 of the previous
section
.
8. Provide sufficient slack in the coaxial cable such that the antenna can rotate over its full 450º
range without putting
any
tension on the coax (see Figure 8). Secure the coax to the tower, using
electrical tape and/or UV-resistant cable ties.
9. Installation is now complete. If you have scratched through the melamine coating of the rotator
during installation, you may wish to apply several coats of clear acrylic spray to help protect the
bare metal from corrosion.
After installation is complete, test the system by operating the rotator through the entire range of
its rotation. It is helpful to do so with the help of an observer, so that rotation can be stopped if
some obstruction, binding, or tension on the coaxial cable’s turning loop should be encountered
during the performance test.
Installation Note
If using a roof tower with a long mast between the top of the tower and the antenna, the use of a
“Guy Bearing” is highly recommended. The Yaesu GS-050 and GS-065 include guying “ears”
which allow attachment of guy cables. As installing a guying system may cause the center-lines of
the guy bearing and the rotator to become mis-aligned, be certain to check the roof tower attach-
ment and guy cable alignment to ensure that the mast is straight.
C
AUTION
9
Содержание G-650A
Страница 14: ...NOTE 12...
