KVH Industries TracVision G4 Technical Manual page 111

TracVision G4 Technical Manual
When rotating the antenna by
hand, go slowly! Hitting the
mechanical stops with excessive
force will damage the azimuth limit
switch.
Refer to Section 4.6, "Computer
Diagnostics" on page 98 for
complete details on connecting a
PC to the system via the
maintenance port.
112
6. Using the nuts removed in Step 2, secure the new
antenna gyro to the reflector bracket. The antenna
gyro should be oriented so that the cable extends
from the top of the gyro, as shown in Figure 5-8.
Using the cable clamp, secure the antenna gyro
cable to the bottom right nut.
7. Carefully move the reflector through its range of
motion to ensure that the cable moves freely
between the elevation mechanism and the lower
assembly. Adjust the antenna gyro cable as
necessary to ensure proper motion.
8. Reinstall the PCB cover.
Calibrating the Antenna Gyro
1. With a PC connected to the ADCU'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>
4. Type =LSTEST<cr>.
5. Type =EL,300<cr>.
6. Type =CALGYRO<cr> .
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.
7. Type ZAP<cr>
If you have a GPS connected to the GyroTrac, no further action is
required. If you do not have a GPS connected to the GyroTrac,
KVH recommends that you complete the following steps to
speed satellite acquisition and improve system performance:
8. Type HALT<cr>
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.
to enter the Debug mode.
Verify that the Antenna
to restart/reinitialize the system.
while the system is performing
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