6 / 10
Offset Parabolic Antennas
Fine Adjustment
1. Loosen the screws on each side of the mast fixing.
2. Swivel the antenna slightly upwards and downwards until
you either measure the strongest antenna signal on your
antenna meter or until you visualise the best image quality
on your screen. To do this, swivel the antenna far enough
upwards and downwards until you get to the limits when the
first "little blocks" (digital) appear on the screen.
3. Position the antenna midway between these two points.
4. Alternate correcting the direction (azimuth) and inclination
(elevation) until the measured results or the picture quality
show no further improvement.
Tip
When tightening the nuts on the clamp, there is
a risk of the antenna turning slightly. Bear this in
mind while performing the fine adjustment and use
it for the precise adjustment.
Finally Tightening of the Antenna
1. Tighten the nuts on the bracket using your hand.
2. Use an open-ended spanner (AF 10 or 13 mm) to tighten up
each of the wing nuts one turn.
For KEA 650 and KEA 750:
3. Tighten the screws left and right of the bracket on the incli-
nation scale (torque spanner: 7 – 10 Nm).
For KEA 850 and KEA 1000:
3. Tighten both screws on each side of the mast fixing (torque
spanner: 7 – 10 Nm).
4. Make sure that all screws are tightened.
5. Insert the cables in the opening on the bottom of the boom
and fasten them so that they are not damaged because of
chafing caused by wind.
Azimuth angle
South
Zenith
East
West
Elevation angle
Fig. 9:
Fine adjustment
Fig. 10: Final tightening of the antenna (KEA 650 and KEA 750)
Fig. 11: Final tightening of the antenna (KEA 850 and KEA 1000)
