TRACKING TUTORIAL
D-3
programming. A spectrum analyzer may be used if the satellite’s spectrum
profile is known.
Now that the antenna is pointing to a known position, the position encoder
offsets can be configured.
6. The 7200 ACU will calculate the look angles for a given longitude if the site
data has been set properly. From the Main menu, select Tracking functions...,
Immediate tracking..., Edit immediate target… and Move to longitude....
7. Select E. Longitude of target [deg] and enter the target's longitude. The
desired look angles will be displayed on the (Look angles [deg]) line of the
display. Record both values to be used as the current position. Press
[SHIFT]+[PRIOR] to return to the Main menu.
8. Select Edit system configuration... and Position encoder configuration.... Select
Encoder direction and using the up and down arrow keys, set the encoder
direction for each axis. The setting can be determined from Main menu,
Tracking functions…, Manual antenna control…. Use “Reversed” for azimuth
if pressing the right arrow moves the antenna in a counter-clockwise direction;
use “Reversed” for elevation if pressing the up arrow produces downward
motion of the antenna.
9. Select Current position [deg] and enter values obtained in step 7 Press [PRIOR]
and answer yes to save changes. Press [PRIOR] to return to the Main menu.
The steptrack defaults should now be set. It is best to configure the steptrack
defaults prior to building any OPT targets. For most systems, no target-specific
parameter adjustments will be necessary.
To set the -3 dB beamwidth, check the data sheet or approximate the value using
the following equation:
freq = receive frequency (in GHz): C-Band = 3.95 GHz
X-Band = 7.50 GHz
Ku-Band = 11.95 GHz
size = antenna diameter in meters
-3 dB beamwidth = ______19________________
frequency (GHz) * size (m)
10. From the Main menu..., select Edit system configuration... and Steptrack
defaults....
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