As advised in the
find the site latitude and longitude, the line of the meridian (True South or North) in the direction
of the equator, the dish elevation on the meridian, and the azimuth of the satellite closest to the
Go to the
Alignment Settings Calculator
page, enter appropriate values for latitude, longitude, and rotor crank angle, and if required
dish offset or dimensions. Print the result for future reference.
... print transponder and channel details of the meridian sat, so that later these can be used
to verify that the correct one has been found. For those in the UK, it'll be
It's absolutely critical for a rotor to ensure that the fixing post is truly
Using a spirit level with both vertical and horizontal levels, perhaps less accurately a
plumb-line, measure at least two points at right-angles to each other …
Find the meridian by one of the three methods explained in the General Introduction, and note a distant
landmark in the required direction.
Azimuth, horizontal direction, is set directly by the rotor mountings:
Ensuring that the rotor is at the central position (no E or W deflection), mount it on the post
with the arm pointing exactly at the meridian landmark;
Mount the dish on the rotor arm, ensuring that it too points exactly at the landmark.
Vertical elevation of the dish is determined by two settings:
The rotor will have a tilt scale with latitude markings, but some measure from vertical,
others from horizontal. Assuming the rotor could go to each extreme, if the line of its
bearings would be horizontal at 0°, vertical at 90°, set the Calculator's Tilt value
(very close to the latitude). However, if the line of the bearings would be vertical at
0°, horizontal at 90°, set 90 - Tilt.
Dish elevation will differ from that for a fixed dish to compensate for the rotor tilt and
If there's a scale and either no offset or as is usual the scale compensates for the
offset, set the Calculator's Elevation value directly on the scale.
If the dish is offset but has a 'true', uncompensated scale, then the offset must be
subtracted from the elevation. The Calculator can do this automatically via
How to find the dish elevation, Other.
The Calculator can also work out the angle for a cardboard template if the dish has no
Once all this is done, drive the rotor the short distance to the meridian sat, making absolutely
certain that it is the correct sat, for example by checking the position
in the receiver's control page, and then tuning in a transponder and checking what is being broadcast
against the sat's Lyngsat page. Once certain that the sat is correct, fine tune the dish
elevation using a sat finder or the receiver's signal data.
Then, if everything is correct, the whole arc should be found. If satellites 'drop out' in ranges
over the arc, this is usually a sign that the central point is off the meridian, and/or the mounting
post isn't exactly vertical, and/or the dish elevation is wrong.
Useful links (no endorsement of external sites intended nor responsibility taken for their content):