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RC4600 ACU Board Set
Chapter 2
Hardware
The azimuth portion of the pointing vector is calculated with respect to local true North. The compass is
used to determine the heading of the centerline of azimuth travel and the required movement in the
azimuth axis is calculated.
In the above example a true heading of 135 degrees to the satellite has been calculated. Based on the
mount's latitude, longitude and date, a local magnetic variation of 10 degrees is calculated. The compass
senses a magnetic heading of 55 for the azimuth reference direction. Applying the magnetic variation,
this yields an apparent true heading of 45 degrees for the antenna reference direction. An azimuth
movement of 90 (135 – 45) degrees clockwise is therefore needed to point at the satellite.
Since a position sensor on the azimuth axis is always active, the RC4600's default displayed azimuth
value is that of the antenna angle. Derived estimates of the magnetic and true heading of the mount may
be selected in the MANUAL (2.1.1.2.1) and LOCATE (2.1.1.2.2.3) modes.
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