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Skew - Polarity
When you set the skew (Polarity) on your LNBF you are lining up your dish exactly to the same horizontal/vertical position as the satellite in the sky. The satellites all lie in a curve in the sky ( Clarke Belt ) and so are at different heights. Ku satellites use Horizontal and Vertical liner polarization and so the skew has to match the (H/V) position of the satellite for optimum satellite signal strength/quality.
When standing in front of your dish, rotate the LNBF anti-clockwise for
+ skew values.
Rotate the LNBF clockwise for - skew values.
When the LNBF is straight up and down it is in the zero position.
Keep your LNBF in the zero position when using a motor mount.
This info is relevant only for liner Ku band LNBF.
Polarization is not a factor with circular (L/R) polarized DBS LNB.
On a multi LNB DBS satellite dish (Phase III / Dish 500...) the reason the skew is set is to simply level or align the LNB'S with the satellites in the sky.
09-13-2004 06:03 PM
I always thought skew was the same thing as polarity. When I hit the auto skew isn't is spinning the little hook around inside the feed horn for horizontal or vertical? Set me straight, I would hate to think I have been wrong for 20 years.
~J~ ~Deke Leonard~
PROUD NEW YORK YANKEE FAN SINCE 1960
8 ft Spun Aluminum Dish since 1983
Motorola 922, Traxis 3500, 6000HD, AZ Box Primium Plus, Quali TV
C & Ku Band-Digital, Analog and DVB S, S2-4:2:0, 4:2:2, HD
UNITED STATES AIR FORCE 1970-1974
3708 BMTS, FLT 1462 (ATC), Lackland AFB, TX
351st Security Police Squadron (SAC), Whiteman AFB, MO
4683rd Security Police Group (ADC), Thule AB, Greenland
INDIANA AIR NATIONAL GUARD 1982-1984
181st Civil Engineers, Prime Beef, Hulman Field, IN
~41 CONSECUTIVE INDIANAPOLIS 500s AND COUNTING~
With C band systems yes, but with a smaller fixed dish the LNB is rotated by hand to the correct skew/polarity then clamped in position, with a KU motorised dish the LNB is set in the zero position and the dish sets its own skew as it turns and tilts, another great reason to have a motorized dish. As someone pointed out the other day they are getting a motorised system not just for the FTA channels but its a great way to keep up to date with whats going on with EVERY satellite up there!
I should have a PCI DVB card this week (because it was cheap) and I am going to see if WGN-DT is still in the clear on Nimiq 2 at 82 degrees. According to a site I went to to help point my old Dish net dish(DBS, single lnb), it says the skew is -17.11 Do I really have to do that? I am thinking no based on your first post here.
No need to bother with skew on a DBS satellite, straight up and down will work for the DBS LNB, same as DirecTV single dish.
I find even a DBS signal gets stronger when the dish is on a motor mount as the dish tilts as it swings and collects slightly more signal.
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