Functional Testing
DTV04 HD TVRO Antenna
6-2
6.5.
Four Quadrant Tracking Test
The 4 Quadrant Tracking Test is one of the best tests that can be performed on any Sea Tel 3-axis antenna.
It verifies good antenna operation including antenna drive, ACU receiver operation, and tracking operation.
This procedure explains the process of and is HIGHLY RECOMMENDED that this test be performed on ALL
antennas that you work on.
Step 1
: Ensure the tracking receiver parameters are set correctly and that antenna is tracking
satellite 101°W, peaked signal (
maximum AGC level above threshold
) with a decoded NID of FFFE.
Record the on Satellite AGC level___________
Record the on Satellite AZ position__________
Record the on Satellite EL position__________
Step 2
: Turn tracking off by pressing the
TRACK
key. Ensure the Tracking LED is no
longer illuminated.
Step 3
: Drive Azimuth down until displayed AGC falls approx. 2-3dB (
Do not drive antenna so far that
AGC falls below threshold
)
1.
Press the
NEXT
arrow key until Antenna window is displayed
2.
Press the
RIGHT
arrow key until AGC reduces approx. 100 to 300 AGC counts (
With
DacRemP’s ADMC graph chart running drive antenna down in Azimuth until AGC falls approx. 3-4 divisions.)
Step 4
: Re-enable tracking and time it takes to get back to peak
1.
Press the
NEXT
arrow key until Antenna window is displayed
2.
Press the
ENTER
arrow key to isolate AZ and AGC
(El and Rel not displayed)
3.
Press the
TRACK
key to toggle tracking to enable tracking.
4.
Time the amount of seconds it takes AGC value takes time to get back to peak as recorded
in Step 1. (
If using DacRemP, each time division equals 8 seconds.)
** 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 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
5.
Verify AGC, AZ, and EL go back to original positions recorded in Step 1.
Step 5
: Repeat steps 2-4 driving antenna the other 3 drive directions
Using the
LEFT
arrow to drive antenna down (CCW) in Azimuth
Using
the
DOWN
arrow key to drive antenna down in Elevation
Using
the
UP
arrow key to drive antenna up in Elevation
Содержание DTV04
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