Specifications

Set-up & Configuration 6009-33 Broadband At Sea
4-3
Figure 4-2 Antenna stopped before the Bow
Figure 4-3 Antenna stops past the Bow
If the antenna stopped before it got to the bow-line; When you initially target a satellite, the antenna will
also stop prior to the satellite position, so you that will have to drive the Azimuth of the antenna UP to
actually find the satellite. Using the same basic procedure as in the Optimizing Targeting paragraph, target
the satellite and record the “Calculated”
Azimuth position that the antenna was driven
to. Drive UP until you find the satellite,
positively identify that you are on the
satellite you targeted and allow tracking to
peak the antenna position. Record the “Peak”
Azimuth position. Subtract the “Peak” position
from the “Calculated” position to determine
the number of degrees of AZ TRIM that would
be required.
Example: In this new installation, I target my
desired satellite and record the Calculated
Azimuth to be 180.5. I drive UP and finally
find my desired satellite at a Peak Azimuth of
227.0 degrees. I subtract Peak from
Calculated and difference to be –46.5 degrees,
therefore the actual Relative position that
needs to be preset into the counter when the
antenna is at the Home Flag is 313.5. HFO =
((360-46.5) / 360)) x 255 = (313.5 / 360) x
255 = 0.87 x 255 = 222.06 which I round
down to 222.
If the antenna went past the bow-line;
When you initially target a satellite, the
antenna will also go past the satellite
position, so that you will have to drive the
Azimuth of the antenna DOWN to actually
find the satellite. Using the same basic
procedure as in the Optimizing Targeting
paragraph, target the satellite and record
the “Calculated” Azimuth position that the
antenna was driven to. Drive DOWN until
you find the satellite, positively identify
that you are on the satellite you targeted
and allow tracking to peak the antenna
position. Record the “Peak” Azimuth
position. Subtract the “Peak” position from
the “Calculated” position to determine the
number of degrees of AZ TRIM that would
be required. . Refer to the calculations
above to determine the HFO you should
use for this antenna.
Example: In this new installation, I target
my desired satellite and record the
Calculated Azimuth to be 180.0. I drive DOWN and finally find my desired satellite at a Peak Azimuth of 90.0
degrees. I subtract Peak from Calculated and difference to be +90.0 degrees, therefore the actual Relative
position that needs to be preset into the counter when the antenna is at the Home Flag is 90.0. HFO = ((90.0)
/ 360)) x 255 = 0.25 x 255 = 63.75 which I round up to 64.
PRELIMINARY