Sea Tel 9497B-1, Installation And Operation Manual

Page: 51 / 94

9497B-1 C/Ku-Band TVRO Maintenance and Troubleshooting
7-15
one location on the equipment frame to the same location on the opposite side of the equipment
frame (ie from the top left of the reflector mounting frame to the top right of the reflector
mounting frame). Do NOT add counter-weight during this step.
4. Last, balance the antenna with the elevation pointed at, or near, zenith (referred to as top to bottom
balance)
by moving existing counter-weights from the top to the bottom or from the
bottom to the top . Always move weight from one location on the equipment frame to the same
location on the opposite side of the equipment frame (ie from the top left of the reflector
mounting frame to the bottom left of the reflector mounting frame). Do NOT add counter-weight
during this step.
5. When completed, the antenna will stay at any position it is pointed in for at least 5 minutes (with no
ship motion).
6.
Do NOT cycle antenna power to re-Initialize the antenna
. Return to the ACU, which is still in
REMOTE BALANCE mode, and press ENTER to exit Remote Balance Mode. When you exit Balance
Mode the antenna will be re-initialized, which turns DishScan, Azimuth, Elevation and Cross-Level
drive ON.
7.4.2.
The following instructions describe the alignment procedure for the polarization mode selection hardware
components and related ACU parameters. You must first verify and/or align the 24V Polang drive and then
verify that the dipole is properly calibrated for Polarity Mode selection.
Linear/Circular Mode Selection Verification and Alignment
24V Polang Drive Verification and Alignment
1. Select the POL TYPE parameter under the SETUP Parameters menu display and change the setting
to 9.
2. View the POL Display Sub-Menu by pressing the
ANTENNA
key 4 times.
3. Using the
UP
and/or
DOWN
arrow
Keys, rotate the feed assembly to its’
center of range so that the metal
patches align horizontally with the scalar
plate. (The Ku band LNB will be oriented
at approx. 2 o'clock). This is the physical
Center Reference position of the feed
assembly.
4. Verify that the displayed POL value is
120 (
±
3).
If within specifications record the display
reading as the Center Reference value
and then skip to step 10.
Center Reference:____________
If not within specifications, continue on
to step 5 to calibrate the POL Pot.