Specifications

6009-33 Broadband At Sea Scheduled Preventive Maintenance
6-2
6.3. Monthly Operator Checks
Description of Maintenance Operator Check
1.1.1. Test GPS Auto-Update
1.1.2. Heading Following
1.1.3. Check Tracking Receiver Settings
1.1.4. Four Quadrant Tracking Test
6.3.1.
This verifies that the GPS position information is automatically updating.
Test GPS Auto-Update
1. Press the NEXT key repeatedly to display the Ship menu. Press ENTER to access edit mode and
view the current Latitude value.
2. Press the LEFT arrow key to bring the cursor up under the ones digit, press UP and then hit ENTER.
The display should immediately show a latitude value one degree higher, but then will be
overwritten within several seconds (back to the previous value) by the GPS engine.
This test does not need to be repeated in the Longitude menu.
6.3.2.
Verify that the value displayed in the heading display of the ACU is consistently the same as the value
displayed on the ships Gyro Compass as the ship turns. Press the NEXT key repeatedly to display the Ship
menu.
Heading Following
1. If the boat is underway, monitor the Heading value to verify that the display changes in the correct
response to the Gyro Compass input (Heading value should always be exactly the same as the Gyro
Compass repeater value).
2. If the boat is NOT underway, loosen the mooring lines enough to allow the ship to turn a few
degrees at the pier. Monitor the Heading value to verify that the display changes in the correct
response to the Gyro Compass input (Heading value should always be exactly the same as the Gyro
Compass repeater value).
6.3.3.
Assure that the following operator settings are correct:
Check Tracking Receiver Settings
1. Tracking Receiver is tuned to the correct frequency.
2. Tracking Receiver baud rate setting is correct.
3. Tracking Receiver FEC rate setting is correct.
4. Tracking Receiver Volt selection is set correctly.
5. Tracking Receiver Tone selection is set correctly.
6. Tracking Receiver NID setting is correct.
6.3.4.
This verifies that the antenna moves in the correct response to the keys, that Tracking is signaling correctly
and that the Tracking commands are being carried out (antenna drives to peak).
Four Quadrant Tracking Test
Press the NEXT key several times to display the Antenna menu.
1. Note the current peak ACG value. Press the Tracking key to toggle Tracking OFF, press the UP arrow
key repeatedly to move the antenna up in elevation until AGC falls about 100 counts. Turn Tracking
ON and verify that the antenna moves back down in elevation and that the AGC rises to its’ previous
high value.
2. Note the current peak ACG value. Press the Tracking key to toggle Tracking OFF, press the DOWN
arrow key repeatedly to move the antenna down in elevation until AGC falls about 100 counts. Turn
Tracking ON and verify that the antenna moves back up in elevation and that the AGC rises to its’
previous high value.
PRELIMINARY