Sea Tel 4009-9 BROADBAND-AT-SEA, Руководство по установке

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4009-9 Installation Manual Functional Testing
15-2
15.4. Four Quadrant Tracking Test
A Four Quadrant Tracking Test is the best way to test tracking (regardless of which tracking mode is being used).
This tests each of the 4 quadrants (UP, DOWN, LEFT & RIGHT of peak signal AZ/EL pointing) to assure that the
tracking mode being used drives the dish back to peak satellite signal level.
Note: Return to peak should take
about the same amount of time from each of the four quadrants.
1. Ensure tracking receiver parameters are set correctly and that system is on satellite with peak signal
(AGC above threshold).
2. Ensure tracking LED is off – If not press the TRACK key to toggle tracking off
3. Press the NEXT arrow key a few times until antenna menu is displayed
4. Note the current Azimuth and AGC values.
5. Press and hold the RIGHT arrow key to drive azimuth down until displayed AGC drops 100 counts
(approx. 2-3 dB) (Do not drive antenna so far that AGC falls below threshold)
6. Press the TRACK key to re-enable tracking.
7. Monitor the Azimuth and AGC Values for the next 20-30 seconds.
8. Verify the Azimuth and AGC return to the values noted in step 4.
9. Verify the amount of time it took for tracking to bring AGC back to peak is within the specifications
** Nominal time to get back to peak is 8-30 seconds. You should also be able to observe the DishScan®
tracking decisions being carried out by ACU by viewing either a 2, 4, 6, or 8 in the bottom left-hand side
of the Azimuth Sub-menu display screen. A normal displayed response would be opposite than that of
the axis driven, i.e. for an antenna driven up (CW) is azimuth you would expect to see a majority of 4’s
being displayed indicating DishScan® senses signal strength higher down in azimuth, therefore sending
the Azimuth Down command to PCU.
A flashing ‘2’ indicates an Elevation Down command
A flashing ‘8’ indicates an Elevation Up command
A flashing ‘4’ indicates an Azimuth Down (CCW) command
A flashing ‘6’ indicates an Azimuth Up (CW) command
A flashing ‘0’ indicates No antenna drive command
10. Repeat steps 2-9 driving antenna the other 3 directions. Replace Step 5 with below steps as each
direction is tested.
11. Using the LEFT arrow to drive antenna down (CCW) in azimuth
12. Using the DOWN arrow key to drive antenna down in elevation
13. Using the UP arrow key to drive antenna up in elevation
If problems are encountered with tracking recovery refer to 123400_C DishScan® document available on our
dealer support site.
15.5. Blockage Simulation Test
Blockage output function is used to modify the behavior of tracking and searching when there is a known
blockage zone. The ACU provides a contact closure to ground on the SW2 terminal of the TMS when the antenna
is pointed within any one of the blockage/hazard zones or the system is searching, targeting, unwrapping or is
mis-pointed by 0.5 degrees or more (FCC TX Mute function for Transmit/Receive systems only). The contact
closure is a transistor switch with a current sinking capability of 0.5 Amp. This logic output control signal is used
for: