Sea Tel DAC-2202, Инструкция по установке и эксплуатации

Страница: 43 / 115

DAC-2202 Antenna Control Unit Setup
5-11
EXAMPLE 4 - Overlaid Blockage Zones: A ship has a Sea Tel antenna mounted on the center line of the ship. A
mast mounted on top of a deckhouse (like the picture
below) is forward and an engine exhaust stack, also on a
deckhouse, is aft. These two blockage areas have wide
azimuth blockage at lower elevations and then a narrower
azimuth area of blockage extends up to a higher value of
elevation.
ZONE 1 begins (AZ LIMIT 1) at 334 degrees
Relative and ends (AZ LIMIT 2) at 026 degrees
Relative. Multiply these Relative positions by 10.
Enter AZ LIMIT 1 value of 3340 and AZ LIMIT 2
value of 0260. In this case the mast height only
causes blockage up to an elevation of 40 degrees,
so we set EL LIMIT 12 to 0400. If the antenna is
between these two AZ Limit points but the
elevation is greater than 40 degrees, the antenna
will no longer be blocked.
ZONE 2 begins (AZ LIMIT 3) at 352 degrees
Relative and ends (AZ LIMIT 4) at 008 degrees
Relative. Multiply these Relative positions by 10.
Enter AZ LIMIT 3 value of 3520 and AZ LIMIT 4
value of 0080. In this case the mast height only
causes blockage up to an elevation of 70 degrees,
so we set EL LIMIT 34 to 0700. If the antenna is
between these two AZ Limit points but the
elevation is greater than 70 degrees, the antenna
will no longer be blocked.
ZONE 3 begins (AZ LIMIT 5) at 155 degrees
Relative and ends (AZ LIMIT 6) at 205 degrees
Relative. Multiply these Relative positions by 10.
Enter AZ LIMIT 5 value of 1550 and AZ LIMIT 6
value of 2050. In this case the mast height only
causes blockage up to an elevation of 30 degrees,
so we set EL LIMIT 56 to 0300. If the antenna is
between these two AZ Limit points but the
elevation is greater than 30 degrees, the antenna
will no longer be blocked.
ZONE 4 begins (AZ LIMIT 7) at 173 degrees
Relative and ends (AZ LIMIT 8) at 187 degrees
Relative. Multiply these Relative positions by 10.
Enter AZ LIMIT 7 value of 1730 and AZ LIMIT 8
value of 1870. In this case the mast height only causes blockage up to an elevation of 55 degrees, so we set
EL LIMIT 78 to 0550. If the antenna is between these two AZ Limit points but the elevation is greater than
55 degrees, the antenna will no longer be blocked. If your ACU software includes 5 volt polarization you will
not see these AZ & EL LIMIT parameters.
5.22. 5V OFFSET (May not be in your software)
CCW 5v Polang servo position reference. Refer to your antenna manual.
To manually update, press the LEFT arrow key to bring the cursor up under the least significant character. Continue to
move the cursor until the desired character to be edited is underscored (selected). Use the UP or DOWN arrow keys to
increment or decrement the selected character.
Use the LEFT or RIGHT arrow key to move the cursor left or right to select other characters to modify. When you are
finished modifying press ENTER to execute the new value OR press NEXT to abort and exit setup mode.