Satellite profiles and modem profiles
98-148248-C Chapter 6: Configuration 6-25
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4. Enter the start and stop elevation angles for the blocking zone. If you enter nothing,
there will be no blocking zone. Values allowed: -30 to 90 degrees.
5. Select No TX for zones if you do not want the system to transmit when the antenna
points within this zone.
If No TX is not selected, the system also transmits when pointing through areas with
blocking objects. The modem will shut off for TX if no signal is received.
6. Click Apply to save the blocking zones.
Optimization of the blocking zones
The blocking map is intended as a tool to optimise the blocking zones in order to reduce the
antenna’s downtime. It shows the active blocking zones and an automatic evaluation of the
antenna reception. Over time the antenna can determine where the signal is blocked by
structures on the ship. The blocking map helps you to set more accurate blocking zones.
To enable a blocking zone and display it on the blocking map you must select Active. The
re-defined zones will show immediately on the map.
The antenna updates the blocking map every 12 hours, showing whether the antenna has
been in a blocking zone (dark grey) or has received a signal (white). After a voyage of days,
weeks, months the blocking map will display where the blocking zones are on the vessel
(dark gray). The time it takes to draw a meaningful map depends on the ship’s size and
motions throughout the voyage. A small ship following a school of fish will have a
populated map faster than a larger tanker sailing across the Atlantic ocean.
Figure 6-20: Blocking zone, example: 45 - 315 degrees
You must enter 2 different elevation angles to have an active blocking zone.
If a blocking zone is defined with TX allowed (No TX not checked), the modem
is not informed about the blocking zone.
Modems may react differently when informed about a blocking zone, this has
influence on recapturing the link. The worst case is that the modem will search
the entire list of available satellites and frequencies when unaware of the
blocking zone, resulting in prolonged down times until the link is recaptured.
For optimum performance it is recommended to check No TX.
360°
000°
45°
90°
180°
135°225°
270°
315°
Antenna
Blocking zone:
45° - 315°
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