Sea Tel DAC-03, Installation And Operation Manual

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Operation DAC-03 Tracking Antenna Controller
2-14
search down 450 degrees in azimuth, search down two Search Increments in elevation, etc until
Search Limit is reached. When the end of the search pattern is reached, the ACU will retarget the
antenna back to the start point shown in the graphic below.
If the desired signal is found at this position, or anywhere within the search pattern, the ACU will
terminate search and go into Tracking mode. If the desired signal is not found the ACU will wait
SEARCH DELAY seconds and then begin the search pattern again. This cycle will repeat until the
desired satellite signal is found or the operator intervenes.
2.8. Auto-Polarization Operation
Another feature of the ACU is auto-polarization. The ACU automatically calculates the required polarization
angle for the feed every 2 seconds based on ship's Latitude, Longitude and the Satellite Longitude. If the
polarization of the feed is not properly peaked, the ACU will send a command to the PCU to drive the 24V
DC motor drive on the feed to peak the polarization.
There is no other operation required when the system is in auto-polarization mode (Polang Type 72). The
system may be put into manual polarization mode for diagnostic and troubleshooting purposes (refer to
your antenna manual).
2.9. Radome Assembly Operation
When operating the system it is necessary that the radome access hatch, or door, be closed and secured in
place at all times. This prevents rain, salt water and wind from entering the radome. Water and excessive
condensation promote rust & corrosion of the antenna pedestal. Wind gusts will disturb the antenna
pointing.