Setup – Home Flag Offset
ST94-21 C/Ku-Band TVRO
7-2
Figure 7-2 Antenna stopped before the Bow
Figure 7-3 Antenna stops past the Bow
If AZ TRIM was a
plus
value: HFO = (TRIM / 360) x 255 Example: AZ TRIM was 0200 (plus 20 degrees).
HFO = (20/360) x 255 = (0.0556) x 255 = 14.16 round off to 14. Set, and Save, HFO to 014 using the “To
Enter the HFO value” procedure below.
If AZ TRIM was a
negative
value: HFO = ((360-TRIM) / 360)) x 255 Example: AZ TRIM = -0450 (minus 45
degrees). HFO = ((360 – 45) / 360)) x 255 = (315 / 360) x 255 = 0.875 x 255 = 223.125 round of to 223. Set,
and Save, HFO to 223 using the “To Enter the HFO value” procedure below.
7.1.2.
You Observe “Home” Pointing is LEFT of the Bow-line:
1.
In this example, I observe that the
Home position is short of the bow
line.
2.
I estimate that it is about 45 degrees.
3.
I target my desired satellite and
record the Calculated Azimuth to be
180.5.
4.
I drive UP (I estimated that I will need
to go UP about 45 degrees) and
finally find my desired satellite.
5.
Turn tracking ON to let the ACU peak
the signal up. When peaked, the
Azimuth is 227.0 degrees.
6.
I subtract Calculated from Peak (227
– 0180.5 = 46.5) and difference is
46.5 degrees.
7.
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 313.5 Relative.
8.
I now calculate the HFO = (313.5 / 360) x 255 = 0.87 x 255 = 222.06 which I round off to 222.
9.
I set, and Save, HFO to 222 using the “To Enter the HFO value” procedure below. After I re-initialize
the relative position of the antenna is now calibrated.
10.
If there is a small amount of error remaining, use AZ TRIM in the Optimizing Targeting procedure to
correct it.
7.1.3.
You Observe “Home” Pointing is RIGHT of the Bow-line:
1.
In this example, I observe that the
Home position is past the bow line.
2.
I estimate that it is about 90
degrees.
3.
I target my desired satellite and
record the Calculated Azimuth to
be 180.0.
4.
I drive DOWN (I estimated that I
will need to go
DOWN
about 89
degrees) and finally find my
desired satellite.
5.
Turn tracking ON to let the ACU
peak the signal up. When peaked,
the Azimuth is 90.0 degrees.
6.
I subtract Calculated from Peak
(180.0 – 90.0 = 90.0) and
difference is 90.0 degrees.
7.
I can calculate what the correct
value for the Home position of the
antenna by
adding
(because
EAR Controlled - ECCN EAR99
Summary of Contents for ST94-21
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