Quote:
Originally Posted by Rico.
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You mentioned that there a error in the elevation setting for the motor, so can you double check my numbers for a stab 90 motor:
Latitude: 28.648
Longitude: 81.298
zip code: 32707 (very close to "ahoss2000" who mentioned that 35 worked but 40 did not)
Dish Elevation (from calculator) : 40.2
Motor Elevation (= Lat + 0.6): 29~29.3
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Use the chart at:
http://www.geo-orbit.org/sizeimgs/modpolanglesr.gif
{Or use a calculator I made, at
BJDISCALC2 }
for your latitude on interpolation, the latitude setting you should use (which is really 90 minus elevation) is around 29.25. Of course you can't set the scale to that precision, but aim for a bit more than 29, rather than for between 28 and 29.
Now also from either the chart or my calculator, you get a declination of about 4.16. This should be subtracted from 45, which is the bend in the motor shaft for your motor. This would give you 40.84. The 40.2 number from the calculator assumes a declination of 4.8. Notice that you'd be using a motor elevation that is about 0.6 deg less (latitude angle .6 more) which is compensated by using a dish elevation that is about 0.6 deg more, so for a sat to your south, they both give the same angle. However using these modified numbers, the mount will track better on sats to your east or west, because the
Sadoun chart assumes that the declination of sats is the same across the arc, which it isn't. Instead, sats to your east or west have about 0.6 deg less declination.