i-Sat
Mounting and usage instructions
Page 10 of 12
7.4. Skew or cross-polarization tuning
Thanks to the new advanced technologies, the area where it’s possible to receive correctly a
satellite signal is increasing more and more. All Europe dedicated TV satellites obviously point
their signals over Central Europe. When the receiver – your caravan – is outside this area, the
antenna looks at the satellite by side, from a certain “angle”. This effect is called “skew” or
"polarization” and affects the receivers located in several countries: Portugal, South Spain,
Morocco, Greece and Western Russia .
Normally the satellite system is able to compensate this effect without problems, but in some
cases a manual LNB re-positioning is needed; in practical terms, the LNB must be rotated by
some degrees. In the following table are displayed the necessary corrections of the SKEW
effect, for some European countries (approximated values)
Zone
Astra I
Hotbird
South Spain
+15°
+10°
Portugal
+15°
+15°
Greece
-12°
-15°
West Russia
-15°
-15°
Other countries
0°
0°
For positive values it is necessary to rotate the LNB CLOCKWISE, using as zero reference the
central position. For negative values the arm must be rotated COUNTERCLOCKWISE.
Execute the following steps:
- Slightly unscrew the 4 allen keys that block the waveguide
- Turn the waveguide clockwise or counter-clockwise. The maximum allowed angle is 15°
- Block again the previously unscrewed screws
For manual antenna positioning it is necessary that satellite receiver and TV set are switched on,
in order to evaluate correctly the signal strength and quality.
.
7.5. Manual positioning
When the antenna is not moving, pressing simultaneously ON/OFF and SAT keys for more than
2 seconds switches to manual positioning mode. See the following table.
1 ON/OFF and SAT pressed >2 sec
Automatic mode
manual mode
2 Operation
Manual positioning of elevation motor
3 ON/OFF and SAT pressed >2 sec
Change motor
4 Operation
Manual positioning of rotation motor
5 ON/OFF and SAT pressed >2 sec
Manual mode
automatic mode
6 Operation
Automatic mode
