Changing LNBs

[FOX]

I am getting a picture breaking only on some transponders, for example all the channels on the Multivision frequency on Hotbird. Most of the channels re fine.

Is it my LNB defected? do i have to replace it. It is 0.3db
Any views? recommendations?

Thanks

[echelon]

could be the lnb or its skew , or could be dish alignment , or both

the only way to be sure is change it and see if it works or not

[ABA]

it would help if we knew what size dish you have and where abouts you are even what coax you have

[FOX]

Sorry Aba not coming back earlier as I was away.

I do not think it is to do with the size of the dish. I leave in south England and 80cm dish. I used to have a good reception, but reception changed about few months ago. Could be the positionning of the dish, though I do have a motorised. what is intriguing is why this is affecting only few frequencies.