Sea Tel 5012-91, Installation Manual, Page: 56 / 138

5012-91 Installation Manual Setup – Home Flag Offset (IMA Software 1.04 or lesser)
8-2
Figure 8-2 Antenna stopped before the Bow
Figure 8-3 Antenna stops past the Bow
8.1.1. You Observe “Home” Pointing is LEFT of the Bow-line (minus HFO):
In this example, I observe that the Home
position is short of the bow line.
I estimate that it is about 45 degrees.
I target my desired satellite and record the
Calculated Azimuth to be 180.5.
I drive UP (I estimated that I will need to go UP
about 45 degrees) and finally find my desired
satellite.
Turn tracking ON to let the ACU peak the signal
up. When peaked, the Azimuth is 227.0
degrees.
I subtract Calculated from Peak (227 – 0180.5
= 46.5) and difference is 46.5 degrees.
Because the antenna initialized to the left of
the bow, I enter the offset as a minus value (-
46.5). If you use AUTO TRIM, it will enter the
correct offset for you.
I can calculate what the correct value for the
Home position of the antenna by subtracting
(because “home” was to the left of bow) this difference of 46.5 from the bow line position 360.0. Therefore
“home” should be -46.5 Relative.
I set, and Save, HFO to 46.5 using the Home Flag entry window, located on the System Configuration screen.
After I re-initialize the relative position of the antenna is now calibrated.
8.1.2. You Observe “Home” Pointing is RIGHT of the Bow-line (positive HFO) :
In this example, I observe that the Home
position is past the bow line.
I estimate that it is about 90 degrees.
I target my desired satellite and record the
Calculated Azimuth to be 180.0.
I drive DOWN (I estimated that I will need
to go DOWN about 89 degrees) and finally
find my desired satellite.
Turn tracking ON to let the ACU peak the
signal up. When peaked, the Azimuth is
90.0 degrees.
I subtract Calculated from Peak (180.0 –
90.0 = 90.0) and difference is 90.0 degrees.
Because the antenna initialized to the right
of the bow, I enter the offset as a positive
value (90.0). If you use AUTO TRIM, it will
enter the correct offset for you.
I can calculate what the correct value for
the Home position of the antenna by
adding (because “home” was to the right of
bow) this difference of 09.0 to the bow line position 000.0. Therefore “home” should be 90.0 Relative.
I set, and Save, HFO to 90.0 using the Home Flag entry window, located on the System Configuration screen
(as shown in the previous section).
After I re-initialize the relative position of the antenna is now calibrated.
If there is a small amount of error remaining, I will use AZ TRIM in the Optimizing Targeting procedure to
correct it (as shown in the previous section).