Skew Calibration (Manual) - Glomex DANUBE R8500 Manuel D'installation Et Utilisation

DANUBE R8500

6.2 SKEW CALIBRATION (MANUAL)

Satellites can transmit in linear (Europe) or circular
(USA) polarisation.
designed to operate with a linear or circular polari-
sation according to the installed LNB, depending
on the satellite whose transmission you want to
receive and on where you are positioned.
Circular polarisation does not require any calibra-
tion for the optimization of the received signal.
On the contrary, LNB operating with linear polarisa-
tion need calibrating upon installation, in order to
optimize the alignment of the LNB with the satellite
whose transmission you want to receive.
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° 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 sat-
ellite 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 2 M4 dowels (1) fastening the LNB
(2) to the disk by using a 2 mm Allen wrench
and manually move the dish, using the parame-
ter 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 2 M4 dowels, position the radome onto
its base again and tighten the 8 fastening screws
again.
GLOMEX antennas are
Fig. 17
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