Promax HD Ranger + Bedienungsanleitung PDF herunterladen (Seite 123)

March 2015 19

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With this information in hand we can calculate the elevation and azimuth we

should put on the dish to begin our coarse antenna alignment. There are

formulas to do that but some websites are again quite useful. There are also free

mobile applications, as Dish Aligner, which calculates the elevation and azimuth

and also your current location determined by the GPS of the mobile phone. This

one is especially interesting for you can select the satellite you want and then

position yourself on a graphical map:

http://science.nasa.gov/realtime/jtrack/3d/JTrack3D.html/

For example if we take ASTRA (19E position) and select a location somewhere in

Germany:

• Latitude: 50 degrees North

• Longitude: 12 degrees East

The required elevation and azimuth for the dish are:

• Azimuth: 170 degrees

• Elevation: 31 degrees

Elevation must be measured from the horizontal level (may be using an

inclinometer) and azimuth from magnetic north (with a compass) there are some

applications for smartphones, as mentioned above, that include compass and

inclinometer, although it should be noted that the measurements made by

mobile phone may be affected by interferences from the antenna itself. It is

normally more practical to start with azimuth moving the dish horizontally and

then look for the elevation.

Figure A2.7.

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Promax HD Ranger + Bedienungsanleitung Seite 123