7 / 32
3. Set the polarisation on the connected feed system to obtain
the best reception using the following formula:
PA
new
= PA
TAB
– V
PA
new
: polarisation angle to be set on the reception system
PA
TAB
: polarisation angle of the selected satellite according to
the table in the LNB user instructions
V: inclination angle of the feed support system according to the
tables on
p.
9ff
4. Set polarisation on other systems until the best reception is
obtained.
5. If necessary, readjust the elevation and azimuth of the
antenna.
–
Loosen the screw on the inclination scale.
–
Tilt the antenna slightly upwards and downwards until
either the antenna meter shows the strongest antenna
signal or visual assessment concludes the best picture
has been achieved. To do this, tilt the antenna far enough
upwards and downwards to get to the limits when the
first "little fish" (analogue) or "little blocks" (digital) appear
on the screen.
–
Position the antenna midway between these two points.
–
Alternately correct the direction (azimuth) and inclination
(elevation) until the measured results or the picture quality
show no further improvement.
Note:
Tightening the nuts at the clamping piece can cause the antenna
to turn slightly! You should allow for this at the fine adjustment
stage (and, if necessary, make use of it when starting the adjust-
ment operation all over again).
Tip
In case of only two satellites, the antenna should
be aligned towards the satellite which is transmit-
ting the weakest signal.
6. Tighten all screws after the adjustment.
Zenith
Elevation angle
West
Azimuth angle
East
South
Horizon
Abb. 6:
Fine adjustment
LNB 1- 4
Satellite 4
Satellite 3
Satellite 2
Satellite 1
Antenna
Fig. 7:
LNB positions