Table of Contents
Advertisement
DANUBE 2 R500
6.2 SKEW CALIBRATION (MANUAL)
Satellites can transmit in linear (Europe) or circular
(USA)
polarisation.
designed to operate with a linear or circular
polarisation according to the installed LNB,
depending on the satellite whose transmission you
want to receive and on where you are positioned.
Circular
polarisation
calibration for the optimization of the received
signal.
On the contrary, LNB operating with linear
polarisation 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° (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 disk by using a 2 mm Allen wrench
and manually move the dish, 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.
GLOMEX
antennas
does
not
require
are
any
Fig. 17
NOTE: Incorrect skew adjustment may cause a
number of problems, from no reception of some
channels up to the impossibility to find the selected
satellite.
52
www.glomex.it
Advertisement
Table of Contents
