Sea Tel 9707D-70 C-BAND TX Installation And Operation Manual page 29

9707D-70 C-Band TXRX
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.
Figure 5-2 Antenna stopped before the Bow
Figure 5-3 Antenna stops past the Bow
5-3
Setup