SATURN MARS RHINE
63
www.glomex.it
E
NGL
ISH
6.3 SKEW CALIBRATION (MANUAL)
Satellites can transmit in linear (Europe) or circular
(USA) polarisation. GLOMEX antennas are
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 screws on the radome and remove the
upper radome from the base;
- loosen the four screws on the front part of the
dish and manually move it, 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 any
more if the boat remains in the same area and
receives transmission from the same satellite.
Once the desired adjustment has been carried out,
tighten the screws, position the upper radome onto
its base again and tighten the fastening screws.
NOTA:
the operations described above are not to
be carried out in case of antennas with automatic
SKEW adjustment!
(V9104SKEWS2U and V9804SKEWS2U)
S
WARNING
While adjusting the SKEW, please make sure not
to disconnect the two sensor cables fastened to the
LNB.
Fig. 24
Fig. 25
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