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DAWNco satellite products
SECTION 5
5.1
ELEVATION ADJUSTMENT
1.
Place an inclinometer on the hub as shown in figure 12.
2.
Adjust the elevation by turning the 5/8" nuts on the elevation rod up or down until
the correct angle is read on the inclinometer.
5.2
AZIMUTH ADJUSTMENT
1.
Make sure that all the 5/8" bolts in the canister are loose. Sweep the antenna in
the azimuth until the desired signal is found. If the desired signal is not found, it
may be necessary to alter the elevation angle slightly. Rotate in azimuth slowly
until loss of signal is observed . Rotate the antenna in the opposite direction until
the signal strengthens, and then weakens again. Set the azimuth between these
two points and snug the canister.
5.3
FINE TUNING
1.
After setting the azimuth, return to the elevation adjustment and fine tune in the
same way, splitting the difference between the two points where loss of signal is
first observed. Check the azimuth adjustment once more, then tighten all canister
and elevation rod hardware.
5.4
REFLECTOR FINE ADJUSTMENT
1.
As discussed in section 2, a level surface is necessary for assembly of the reflec-
tor. If a level surface is not available, the reflector may be checked for accuracy
by use of strings across the aperture.
2.
Use thin cord across the reflector diameter from rim to rim, at four places. One
end of each string should be taped to the rim just to one side of the seam
between two petals. The other end should be fastened 180 degrees opposite. All
four strings should lightly touch where they cross at the center. The distance
from center of the reflector (hub to plate) to the strings should be 16.09.
3.
If the reflector does not check out as described above within approximately a
1/4", reflector adjustment may be done. Identify the point on the rim that is either
high or low. Loosen the four bolts on the long and short angle brace behind the
radial line of the reflector. Gently push or pull on the reflector rim until it is
brought into position. While one installer holds the rim, the other should tighten
all the brace bolts fully. Repeat this process as required, loosening and
tightening only one set of braces at a time.
ANTENNA ALIGNMENT AND TUNING
28
4096-356
2.4M Az/El TRUSS MOUNT
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