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6.2 SKEW CALIBRATION (MANUAL)
The LNBs installed in GLOMEX satellite TV
antennas are designed to receive the satellites that
transmit in linear polarization (Europe) and require
calibration during installation to optimize LNB
alignment with the satellite to be received.
When you are at the same longitude of the satellite,
its horizontal and vertical signals are aligned with
the horizon. When the satellite is east or west of
your position, the signal of the satellite will appear
as clockwise or counterclockwise shifted. Both the
horizontal and the vertical signal will be shifted by
the same angle, and therefore they will always be
perpendicular to each other.
The degree of rotation will depend on the distance
to the east or to the west between the position of
the antenna and the position of the satellite, and on
your distance from the equator.
Once you move to an area with a longitude more
than +/- 10° (corresponding to about 1000 km) from
the previous position, the LNB must be manually
adjusted in order to obtain the best possible signal.
Antennas are delivered with the LNB optimized for
an area with longitude 12° East while receiving
satellite 13° East.
For the adjustment of the LNB, proceed as follows:
- loosen the 8 screws on the radome and remove
it from the base;
- loosen the 3 M4 dowels (1) fastening the LNB
(2) to the dish by using a 2 mm Allen wrench
and manually move the LNB, using the
parameter of signal quality of the digital receiver
in use as a reference for correct calibration
(please refer to the receiver’s manual).
Calibration does not need to be changed if the
vehicle remains in the same area and receives
transmission from the same satellite.
Once the desired adjustment has been carried out,
tighten the 3 M4 dowels, position the radome onto
its base again and tighten the 8 fastening screws
again.
NOTA:
Incorrect adjustment of the screw may
cause a number of problems: from no reception of
some channels up to impossibility to find the
selected satellite.
Fig. 20
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