Service manual

RC2000 Service Manual Chapter 4 Common RC2000 Questions 23
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Chapter 4 COMMON RC2000 QUESTIONS
4.1 Invalid Data Entry
This error can occur in AUTO mode when the user attempts to position the antenna on a satellite which
has been previously stored in non-volatile memory (satellites are stored in non-volatile memory via
SETUP mode) and either the azimuth, elevation, horizontal polarization or vertical polarization data
fields contain invalid data. In this context, invalid data means that the data lies outside the limits
associated with that axis.
4.1.1 Background
When a user stores a satellite in non-volatile memory of an RC2000A the following data elements are
actually loaded into memory...
The satellite name (10 alphanumeric characters), the satellite azimuth and elevation position (in
position counts - 30 to 65535), the satellite horizontal and vertical polarization positions, and the
satellite longitude.
For an RC2000C the following additional information is also stored in non-volatile memory: a flag that
indicates whether or not the satellite is in an inclined orbit, the inclination of the satellite’s orbital plane
with respect to the earth’s equatorial plane (at the time the satellite was stored in memory), and a code
that indicates the satellite band (C or Ku).
4.1.2 Events Typically Associated with the INVALID DATA ENTRY Error Message
This error is generally caused by one of two events...
1. The user has redefined the azimuth or elevation limits, or
2. The user has changed the type of polarization control device via the Rotating Feed Present
CONFIG mode item.
4.1.3 Azimuth and Elevation Limits
The azimuth and elevation limits are set by the user in LIMITS mode. The INVALID DATA ENTRY
alarm can occur if the user...
1. Initially sets the azimuth and elevation limits, then
2. programs some satellites into non-volatile memory, then
3. changes the azimuth and elevation limits (via LIMITS mode) so that the antenna’s range of azimuth
or elevation movement is reduced relative to initial azimuth and elevation limits defined in step 1,
4. If the user attempts to recall (via AUTO mode) a satellite programmed into memory in step 2 and
the azimuth or elevation position associated with that satellite entry is outside the CURRENT
azimuth or elevation limits the controller will not perform the automatic move and the INVALID
DATA ENTRY message will be displayed.
4.1.4 Changing the Polarization Control Device Associated with the Controller
The RC2000 supports two types of polarization control devices...