Sea Tel DAC-03 Installation And Operation Manual Download Page 40

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Setup

DAC-03 Tracking Antenna Controller

5-4

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

MUST

also be turned

5.3.13.

POLANG TYPE

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 at the optimum polarization position, 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
Typical default setting for all 24 VDC polarization system is 0072 for Auto-Polarization mode. 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.
Some common setting are listed below. If you wish to change this parameter key in the desired
value and press ENTER.

128

Indicates 2 quadrant LHCP/RHCP display

for 5v auto Polang with numeric display

for 5v auto Polang with HORZ/VERT display

for 24v auto Polang with numeric display

for Lin/Circ feed with auto Polang

for 24v auto Polang with HORZ/VERT display

for 24v manual Polang with numeric display

for no Polang

5.3.14.

POL OFFSET

CCW 24V Polang pot position reference. Default setting is 0030. May be incremented to adjust
polarization while in Auto-Pol mode to optimize cross-pol isolation. Each increment equals one
degree of polarization rotation (0038 = +8 degrees), decrement below 30 for minus polarization
(0022 = -8 degrees). If you wish to change this parameter, key in the desired value and press
ENTER.

5.3.15.

POL SCALE

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

5.3.16.

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.
When the AZ LIMIT parameters are set to create these

ZONES,

up to three, 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 satellite you targeted last (if 4 value is included in SYSTEM
TYPE). Timeout and re-target will continue until the satellite is re-acquired and tracking can
resume.

“BLOCKED” will be displayed in the TRACKING window wherever the antenna is inside one
of the zones.

A contact closure to ground (or an open if the blockage logic is reversed – See SYSTEM
TYPE 16 value) is provided on the SW2 terminal of the Terminal Mounting Strip. This
Switch output provides a “Blocked”, “RF Radiation Hazard” or “FCC TX Mute” logic output.
When the antenna exits the zone it will be on satellite, tracking and the SW2 logic contact
closure will open.

The lower and upper limits are user programmable and are stored in NVRAM within the ACU
parameter list.