quick question on lnb skew

if I need to set the LNB skew to say -7 and looking at the LNB from behind (as in I am looking at the front of the dish) would I need to rotate clockwise ?

jfish said:

if I need to set the LNB skew to say -7 and looking at the LNB from behind (as in I am looking at the front of the dish) would I need to rotate clockwise ?

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'-7' is rather odd terminology. It's better to work it out from where you are relative to the satellite you want to pick up. IF, for example you are west of the satellite (as most of us are for Astra at 28.2E) then it is clock-wise as viewed from behind the LNB/facing the dish.
So look up the latitude for your location and decide whether you are west (c/w) or east (ACW) of your desired sat. If it's a strong signal it's not critical, but with a weak sat, a degree or 2 of skew can make all the difference.

The dish is pointing to Eutelsat 9E - dishpointer.com says I need LNB skew of -7.7. The dish was originally pointed to 39E - since I have moved it to 9E I have not adjusted the LNB skew. Will this effect signal on certain transponders.

jfish said:

The dish is pointing to Eutelsat 9E - dishpointer.com says I need LNB skew of -7.7. The dish was originally pointed to 39E - since I have moved it to 9E I have not adjusted the LNB skew. Will this effect signal on certain transponders.

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Yes, very much so. If it was correctly set up for Hellas, the LNB skew will be quite far round- the cable connector will be somewhere between 7 & 8 o'clock. It will probably still work, but it will be lot better if you back it off to just slightly c/w off vertical. (Bear in mind even 7 o'clock is 30°, way too much!).

trevortron said:

Yes, very much so. If it was correctly set up for Hellas, the LNB skew will be quite far round- the cable connector will be somewhere between 7 & 8 o'clock. It will probably still work, but it will be lot better if you back it off to just slightly c/w off vertical. (Bear in mind even 7 o'clock is 30°, way too much!).

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yes its at the 7pm mark .. so will adjust it tomorrow now

found this image as a good reference point

http://imageshack.us/scaled/landing/132/y07.png

Probably not relevant to the OP question but just a word of warning to make sure of the skew direction of your make of LNB, out here in Spain there are a lot of Sharp LNBs which skew in the opposite direction, so a normal skew of 'five past seven' for 28.2E becomes 'five to five' on the Sharps, confusing huh!

dantis said:

Probably not relevant to the OP question but just a word of warning to make sure of the skew direction of your make of LNB, out here in Spain there are a lot of Sharp LNBs which skew in the opposite direction, so a normal skew of 'five past seven' for 28.2E becomes 'five to five' on the Sharps, confusing huh!

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What Sharp is that? I've seen it on some Televés LNB's (the yellow ones)- it's not reversed, just offset acw by about 30°.

Not sure Trev, they are white and quite old, I noticed some dishes in our area with these LNBs and wondered how they were getting a signal, spoke to a local satellite company who explained that they skew in the opposite direction.