Setup Procedure
Setup Blockage Zone
OceanTRx
TM
4-500 Installation and Operations Manual
7-15
7.5
Setup Blockage Zone
This section describes how to configure blockage zones. These zones are areas in which
elements (such as the ship’s funnel) may interfere with antenna to satellite
communication. The zones may also be areas frequented by personnel, in which case it
is recommended to configure the LNB to be disabled when the signal transverses these
areas.
You can define up to four blockage zones defined by the azimuth and elevation angles
(per zone).
In addition, power transmission can be turned ON or OFF globally for all
defined zones.
When the antenna is within one of the zones, the following things happen:
Tracking continues as long as the AGC value is greater than the Threshold value
(default value = -75dbm). The AGC threshold value can be modified (section
When the AGC value drops below Threshold, the antenna will wait a few seconds
before reverting to
Search Mode
in System Mode. The search pattern can re-target
will continue until the satellite is re-acquired and tracking can resume.
“system messages: antenna view blocked”. And antenna will switch from
Step-Track
mode to
Point-to-Sat
mode.
NOTE: If this is a dual system, the antennas may be switched (depending on the system configuration)
Figure
7-16: Top View of Blockage Zones Azimuth
