Calibrating the Gyros
To calibrate the azimuth, elevation, and roll gyros, follow the
steps below.
1. With a PC connected to the MCU’s maintenance
port, apply power to the antenna unit.
2. Type HALT<cr> (<cr> indicates a carriage
return/ENTER key) while the system is performing
the limit switch initialization routine. The system
will complete the initialization function by finding
the azimuth and elevation switch limits and then
go to the home position.
3. Type DEBUGON<cr> to enter the Debug Mode.
4. Type EL,300<cr>.
5. Using a digital level (or equivalent), measure and
record the angle of the feed tube, as shown in
Figure 5-19.
6. Type =CALUP,XX.X<cr>, where XX.X is the
number you recorded in Step 5.
7. Using a digital level, measure and record the angle
of the roll gyro on the PCB module, as shown in
Figure 5-20.
8. Type GYROANGLE,X.XX<cr>, where XX.X is the
number you recorded in Step 7.
9. Type =CALGYRO<cr>. Verify that the Antenna
Gyro Azimuth scale factor is between -0.00090 and
-0.00110 and the Antenna Gyro Elevation scale
factor is between 0.00090 and 0.00110.
10. Type ZAP<cr> to restart/reinitialize the system.
Maintenance
54-0198 105
Refer to Section 4.5, “Computer
Diagnostics,” on page 88 for
complete details on connecting a
PC to the system via the
maintenance port.
Figure 5-19
Measuring Feed Tube Angle
Figure 5-20
Measuring Roll Gyro Angle
Feed Tube
PCB Module