Maintenance and Troubleshooting
9497B-1 C/Ku-Band TVRO
7-16
POL Pot Calibration
1.
Loosen the screw that secures the POL
Pot mounting plate to the feed Scalar
plate.
2.
Slide mounting plate out until the POL
Pot sprocket is no longer engaged with
the OMT sprocket.
3.
With your finger manually rotate the
POL Pot Sprocket until a POL reading of
120 is achieved.
4.
Slide mounting plate in until the POL Pot
sprocket is fully engaged with the OMT
sprocket.
5.
Tighten the screw that secures the POL
Pot mounting plate to the feed Scalar
plate.
6.
Press and hold the
UP
arrow key and verify the OMT is able to rotate without obstruction 90° CW
from center reference and that POL reading displays 222 (upper electrical stop).
7.
Press and hold the
DOWN
arrow key and verify the OMT is able to rotate without obstruction
180° CCW and that POL reading displays 28 (lower electrical stop).
NOTE:
If the feed does not allow a full 180 degree rotation to the CCW position, (CW
looking into the dish), move the feed CCW far as it will go and readjust the Polang
potentiometer setting so the POL display shows 30-32. Move the feed to its’ physical
center reference position and record the new POL reading. Calculate and enter in the new
POL OFFSET parameter.
POL OFFSET= Center Reference Value
-
POL SCALE value
8.
Drive the Feed assembly back to center of range.
Polarity Mode Selection (5V Pulse Servo Motor) Verification and Alignment
1.
Change the POL TYPE parameter to 48.
2.
View the POL submenu display. Rotate
the feed probe by entering numeric
values as required in the range from 75
to 135 so that the dipole probe is
aligned with the horizontal metal
patches in the feed. Record the POL
display reading as the CCW
value:________
If any value >135 is required to align
dipole skip ahead to step 6
.
3.
Rotate the dipole probe CW 90 degrees
and align with the vertical metal patches
by adding 90
±
20 to the CCW value
achieved in step 2).
Record the POL display reading as the
center value:__________.
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