Sea Tel DAC-2202 Installation And Operation Manual Download Page 39

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DAC-2202 Antenna Control Unit

Setup

5-7

the new value Continue pressing

ENTER

until SAVE NEW PARAMETERS is displayed, and then press the

RIGHT

arrow,

arrow then

ENTER

to save the change(s).

5.17.

GYRO TYPE

Selects the type of gyro compass interface for ship turning compensation.

362

for 360:1 Synchro with S/D Converter

360

for 360:1 Synchro with SBS Converter

for 90:1 Synchro with S/D Converter

for 36:1 Synchro with S/D Converter

for Step-By-Step gyro or NMEA gyro

for 1:1 Synchro with S/D Converter

for No Gyro linear AZ Search Mode (No Heading input available)

If Gyro Type will be set to 0000, you must set SWEEP INC correctly and SATELLITE REFERENCE MODE

MUST

also be

turned

To manually update, press the LEFT arrow key to bring the cursor 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.

5.18.

POLANG TYPE

Default setting is 0072 for Auto-Polarization mode. This automatically adjusts the polarization of the feed by
calculating the required polarization angle for the feed every 2 seconds based on ship's Latitude, Longitude and the
Satellite Longitude. If the feed is not properly oriented, the ACU will send a command to the PCU to adjust the feed.
The system will function with all 24V DC motor driven feeds assemblies.



Set to 0000 when a circular feed is installed on your dish (polarization drive OFF)



Set to 0009 (Manual Polarization) for troubleshooting or polarization alignment purposes OR if you desire to
manually adjust the polarization of the feed as the ship travels. Refer to your antenna manual.



Set to 0072 for default Auto-Pol mode.



Set to 0073 for C-Band Circular systems which will be used at high elevation look angles (above 83 degrees).

To change this parameter value, press the LEFT arrow key to bring the cursor 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.

5.19.

POL OFFSET

The POL OFFSET parameter is utilized to mechanically calibrate the feed assembly installed onto your antenna (this
technically calibrates the Polang pot position reference to its’ center of range). Each increment equals one degree of
polarization rotation. Refer to Optimizing Auto-Polarization in the setup section of your antenna manual for detailed
instructions on how to perform this calibration procedure.

5.20.

POL SCALE

90 degree 24V Polang pot motion scale factor. Leave at factory default (0090).

5.21.

Radiation Hazard and Blockage Mapping (AZ LIMIT parameters)

The ACU can be programmed with relative azimuth sectors (zones) where blockage exists or where transmit power
would endanger personnel who are frequently in that area. Your ACU software may allow you to set four zones or it
will only three zones and i5 volt polarization.

When the AZ LIMIT parameters are set to create these

ZONES

(up to four), several things happen when the antenna is

within one of the zones:

Tracking continues as long as the AGC value is greater than the Threshold value. When the AGC value drops
below Threshold, the antenna will wait “Search Delay” parameter amount of time and then re-target the