Signal quality vs. signal strength

I have been having some problems lately getting CNBC and Euronews. I get audio and video, but many times the picture quality starts to pixellate and the audio gets choppy. I checked the dish and no problems with snow or ice. The signal strenght "screeen" on my box tells me that I have 80% signal strenght but only 48% signal quality. Any ideas what the problem might be? Everthing else comes in fine. Any ideas?

There are a few things it could be..

Start with putting your spectrum anyliser on the dish and work down from there.. This is what I would do!

Depending on your dish (size) and cable (length/quality) 80% strength is nothing special and 48% quality is downright awful, so it's no surprise you have problems. Aim for 90% or better strength ad 80% or better quality for consitently good reception. Apart from checking general azimuth/elevation alignment of the dish (which should improve strength) check LNB skew, cable connections for damage or water ingress, or look for cable-damage, to determine the reason for quality loss. It might also be a failing LNB. As Grinner says (well, implies), without the right equipment to quickly pinpoint the problem it can be tedious and time consuming search by elimination ...

Ok, LNBs were new three months ago and no other channels have this problem...

What reading did you get on your spectrum anylizer?

This is very important. as It could be Faulty socket, cable, warped dish, Construction crane.. Faulty receicer, lnb cable or just an opperation incomprehension af any of the above...

or is it just the twisted humour of a warped satellite engineer?

How many LNBs do you have? 60% of all electronic failure within 5 years occurs in the first 3 months of use. As your quality levels are so low you have terrible signal noise issues, which could be prevalent in certain frequency ranges. Hence the need for the spectrum anylizer [sic]