Azimuth changes Elevation doesn't

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Is this a correct statement? "A motorized dish can only receive signals from
satellites that are at the same elevation but different azimuth."

If I install a 30" motorized dish for Ku Band, once the El and Az are set for
my first satellite all the motor does is rotate the dish from left to right, so
am I stuck choosing only satellites on that same elevation?

 

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On 08 Jul 2004 20:13:00 GMT, rakblight@aol.com (Rakblight) wrote:

>Is this a correct statement? "A motorized dish can only receive signals from
>satellites that are at the same elevation but different azimuth."
>
>If I install a 30" motorized dish for Ku Band, once the El and Az are set for
>my first satellite all the motor does is rotate the dish from left to right, so
>am I stuck choosing only satellites on that same elevation?

No. They have an inclination/declinaion which means it will see the
arc fine, if properly set up.

 

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"Rakblight" <rakblight@aol.com> a écrit dans le message de news:
20040708161300.05775.00001334@mb-m05.aol.com...
> Is this a correct statement? "A motorized dish can only receive signals
from
> satellites that are at the same elevation but different azimuth."
>
> If I install a 30" motorized dish for Ku Band, once the El and Az are set
for
> my first satellite all the motor does is rotate the dish from left to
right, so
> am I stuck choosing only satellites on that same elevation?
>
This is fortunately not true !
The rotation does not happen around a vertical axis, but around an inclined
axis (which has to be adjusted since it depends on the latitude where you
are located) in order to follow the "visible" part of the circle at 36000 km
above the equator, on which all geostationnary satellites are located (the
so-called "Clarke belt").
There are many possible systems to do this, but for relatively small
antennas like yours, the simplest are the DiSeqC 1.2 motors. These systems
are simple to install (adjustment on one reference satellite only).
Hervé.