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Message: <blockquote data-quote="archive10" data-source="post: 950134">The CM feedhorn is in larger than any of the built-in feedhorns.It tends to work with an advantage with the larger CMs (e.g. yours), and give better result than the integrated feedhorns.Indications from other members shows that it is not the case on the smaller ones (e.g CM100 and CM120), where an integrated feedhorn works as well or better.So with a 2.4, you might get better resulsts on the 2G cross-polarised (same frequency, different polarisation) with a CM feedhorn + a C120 LNB (and that would then really mean an Invacom QDF-031).But still - might - is the word.From here north of Copenhagen using a CM180 and any LNB with a Installer-grade meter, I can measure the difference of a few degress (2-4) in terms of one or two dB in BER (similar to the "Q" og most receivers). +/- 20 degrees will render the signal unusable.In any case, your skew should be just about 1.5 degrees, so almost vertical. In other words it should be leaning ever-so-slightly to the right when looking into the front of the dish.This is typical of the CMs.The CM feedhorns (for which the holder where designed) have fairly long necks.Most LNBs with short necks can't get the focal point of the integrated feedhorn far enough away from the LNB holder.The IBUQs have the extra long necks that allow the LNB to get roughly to the right distance from the holder.You can see this in the pics below; compare the IBUQ with the CM feedhorn (witb an Invacom QDF-031 attached).For info, I there's also a pic of the IBUQ with the plastic casing removed, to illustrate the the Inverto feedhorn is a bit smaller than the CM one.[ATTACH=full]87060[/ATTACH][ATTACH=full]87061[/ATTACH][ATTACH=full]87062[/ATTACH] I am not sure you will get more from the IBUQ, even if you could mount it closer to the reflector.However, I have not come across anyone who has tried this, and sadly [USER=312276]@RimaNTSS[/USER], who has made many-a-customised-LNB-holder that would allow this, does not have a large CM dish, so I don't think he's ever tried.My guess is that the neck length of the IBUQ is just right for the CMs.</blockquote>

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