Sea Tel DAC-2202, Installation And Operation Manual

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DAC-2202 Antenna Control Unit Setup
5-9
In unlimited antenna systems the Relative position of the antenna must have been calibrated by properly setting the
Home Flag Offset (HFO) value in the PCU. The HFO calibrates Relative to display 0000 when the antenna is pointed in-
line with the bow of the boat/ship (parallel to the bow).
Convert the relative readings to AZ LIMIT/EL LIMIT values by multiplying by 10. Enter the beginning of the
first
blockage region as AZ LIMIT 1 and the end of the region (clockwise direction from AZ LIMIT 1) as AZ LIMIT 2
parameters in the ACU. If needed, repeat setting AZ LIMIT 3 & 4 for a
second
ZONE and then AZ LIMIT 5 & 6 if a
third
ZONE is needed. All
unneeded
zone AZ LIMIT pairs
must
be set to 0000. Set the upper elevation limit of each
blockage zone (also entered in degrees multiplied by 10).
EXAMPLE 1 - Three blockage Zones: A ship has a Sea
Tel antenna mounted on the port side and an Inmarsat
antenna mounted on the starboard side. A mast forward, the
Inmarsat antenna to starboard and an engine exhaust stack
aft form the three zones where satellite signal is blocked (as
shown in the graphic). In this example zone 1 is caused by
the mast, zone 2 is from the Inmarsat antenna, zone 3 is
from the stack and zone 4 is not needed:
ZONE 1 begins (AZ LIMIT 1) at 12 degrees Relative
and ends (AZ LIMIT 2) at 18 degrees Relative.
Multiply these Relative positions by 10. Enter AZ
LIMIT 1 value of 0120 and AZ LIMIT 2 value of
0180. In this case the mast height only causes
blockage up to an elevation of 50 degrees, so we set
EL LIMIT 12 to 0500. If the antenna is between
these two AZ Limit points but the elevation is
greater than 50 degrees, the antenna will no longer
be blocked.
ZONE 2 begins (AZ LIMIT 3) at 82 degrees Relative
and ends (AZ LIMIT 4) at 106 degrees Relative.
Multiply these Relative positions by 10. Enter AZ
LIMIT 3 value of 0820 and AZ LIMIT 4 value of 1060. In this case the Inmarsat antenna height only causes
blockage up to an elevation of 12 degrees, so we set EL LIMIT 34 to 0120. If the antenna is between these
two AZ Limit points but the elevation is greater than 12 degrees, the antenna will no longer be blocked.
ZONE 3 begins (AZ LIMIT 5) at 156 degrees Relative and ends (AZ LIMIT 6) at 172 degrees Relative. Multiply
these Relative positions by 10. Enter AZ LIMIT 5 value of 1560 and AZ LIMIT 6 value of 1720. In this case
the stack antenna height only causes blockage up to an elevation of 36 degrees, so we set EL LIMIT 56 to
0360. If the antenna is between these two AZ Limit points but the elevation is greater than 36 degrees, the
antenna will no longer be blocked.
ZONE 4 is not needed. Enter AZ LIMIT 7 value of 0000 and AZ LIMIT 8 value of 0000. Set EL LIMIT 78 to
0000. If your ACU software includes 5 volt polarization you will not see these AZ & EL LIMIT parameters.
EXAMPLE 2 - Three blockage Zones, Dual Antenna
configuration:
A ship has 2 Sea Tel antennas, “Antenna
A” mounted on the port side and “Antenna B” mounted on
the starboard side. Antenna A is designated as the
master
antenna and its zones would be set as in example 1 above.
The mast forward, Antenna A to port and the engine
exhaust stack aft form the three zones where satellite
signal is blocked from Antenna B. The SW2 logic output
from Antenna A (ACU A) and Antenna B (ACU B) are used
to control a “Dual Antenna Arbitrator”, which will route
satellite signal from the
un-blocked antenna to the other
below decks equipment. If both antennas are tracking the
same satellite, they will not both be blocked at the same
time. The logic output will switch to provide satellite signal
to the below decks equipment from Antenna A when it is
not blocked and will switch to provide satellite signal from
Antenna B whenever Antenna A is blocked . The switches
will not change state if both antennas are blocked, or if
both are on satellite.