34
POINTING THE ANTENNA AND CONNECTING THE RADIO
TOOLS NEEDED
• Compass
• Open-face or socket wrench
• Torque wrench
• Wrench
• Permanent marker
This section describes how to point the antenna dish at the sat-
ellite. Correct alignment is critical to the operation of the
DirecPC system. When the antenna dish is pointed directly at
the satellite, it receives a strong signal. If it is not positioned
properly, the signal may be weak, and errors may result during
data transfers. The signal quality would also deteriorate on
cloudy, windy, or rainy days.
After you have pointed the antenna, you will turn off your
computer and connect the radio. Do not connect the satellite
modem transmitter cable to the radio until you are
instructed to do so.
The elevation value calculated by the antenna pointing soft-
ware is accurate enough to allow you to acquire the satellite
signal on the first try if the antenna mast is plumb.
If your mast is not perfectly vertical, you can still point the
antenna but it is more difficult. Solving the problem is
explained on page 25, Step 1.
THE ITERATIVE PROCESS OF POINTING YOUR ANTENNA
Pointing the antenna is an iterative process. That is, you go
through cycles of making small adjustments to the antenna
until you are satisfied you cannot get a stronger satellite signal.
When you have achieved the strongest possible signal, you
have peaked the signal.
You will be making three adjustments on your antenna:
polarization (rotation of the antenna), azimuth (pointing side to
side), and elevation (pointing up or down). If you cannot
remember what these three things are, review page 5.
After peaking the signal at the azimuth setting, and then peak-
ing the signal at the elevation setting, you may wish to readjust
the azimuth setting to see if elevation setting has affected its
optimum setting. And after you have set the azimuth and eleva-
tion setting, you may find that by making minor adjustments in
the polarization setting, you affect the optimum azimuth and
elevation settings, and must go back and adjust them again.
You may achieve optimum signal strength after just a few
adjustments, or you may find that several adjustments are
needed. Remember that by getting the strongest possible signal
you ensure that you can use all your system’s capacity.
CAUTION
• This device emits radio frequency energy when in the
transmit mode.
• To avoid injury, do not place head or other body parts
between feed horn and satellite antenna dish when
system is operational.
• Unplug indoor power connection before performing
maintenance or adding upgrades to any antenna com-
ponents.
Antenna Dish
Polarization Scale
Elevation Scale
Mast
Elevation Bolt
Azimuth Reference Marks