COBHAM Sea Tel 4010W-91, Installation Manual

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4010W-91 Installation Manual Setup – Optimizing Polarity & Cross-Pol Isolation
13-2
8. Make a series of small changes in the opposite direction until you see the signal peak and then fall the same
amount as noted in step 6.
9. Note this SAT SKEW value.
10. Set SAT SKEW to mid way between the value noted in step 7 & 9.
11. Save your new SAT SKEW value.
13.4. Optimizing Auto-Polarization Cross-Pol Isolation
During commissioning, under guidance from the network operation center, you will be adjusting to minimize the effect
of your transmission on the opposite polarization which maximizes your Cross-Pol isolation. Contact your satellite
provider to help you (over the phone) to optimize the polarity angle for maximum Cross-Pol isolation (this optimizes
your transmit polarity and is much more accurate than trying to optimize your receive polarity).
1. Verify that tracking is ON and that the antenna is peaked on your targeted satellite (targeting calculates the
azimuth, elevation and polarization angles).
2. Follow your service provider technicians instructions to set the modem to begin transmitting a CW (pure
carrier) signal.
3. Go to the SAT SKEW parameter in the Satellite menu of the ACU.
4. Press the LEFT arrow to edit the current value.
5. While under direction of the technician (on the phone), press the UP arrow to increment or the DOWN arrow
to decrement the value and then hit the ENTER key to adjust the feed.
6. The technician should indicate whether the adjustment you made improved, or worsened, the cross-pol
isolation. If it improved he will have you make another small adjustment in the same direction. If it
worsened he will have you make a small adjustment in the opposite direction.
7. Press the RIGHT key again, make the next change as directed and hit ENTER to carry out the adjustment.
8. Repeat this process of making small adjustments until the technician confirms that cross-pol isolation is
optimized.
9.
Save
your new SAT SKEW value.