Hi Tony,
I'll move this to the Satellite General section (as it's not network related).
As you'll appreciate, without being there with test equipment, I can only go by the info you've provided.
There's a few things that don't sit right with me for an SMATV system.
1. Size of the dish and cabling distance to the distribution location.
An 80cm dish doesn't even comply with Foxtel standard for commercial installations.
Especially with long cable runs, you should probably be using a 1.2m dish and RG11 Quadshield cable to the distribution point.
2. Use of inline amps.
Why?
If signal levels are too low, it will likely be dish size is too small and/or there are excessive cable losses.
What size cable has been used, RG6 or RG11?
Inline amps are typically inherently noisy and should be avoided wherever possible.
If they are being used to compensate for losses.... fit a larger dish and get rid of them.
3. Splitters used, instead of a larger capacity multiswitch, or cascadable smaller multiswitches, eg: 2X8-Way cascaded.
Pixelation of fast-moving objects are more likely compression of the broadcast transmission/recording, rather than received signal.
To a lesser extent, displays may also have an issue.
Have you checked if this pixellation is occurring on all screens?
Can you meter record Reed–Solomon levels?
BER/MER often can't detect very fast transient glitches experienced with some types of interference, so being able to 'see' dropped packet figures is extremely helpful locating these types of issues.
The signal figures you've quoted sound fine, so I'm actually leaning towards the pixellation being either the fault of the broadcast, or the displays. (Make sure the displays have the latest firmware).
From what you've described, it sounds like more of an 'image' issue, rather than a signal issue.
How are all the modulators being combined?
If terrestrial FTA also being mixed with the modulated decoders?
What modulated distribution platform is being used... DVB-T? IP?
What distribution amps are being used?
Interference is possible, but not generally experienced with Ku-Band, but I have seen some 4G interference if located close to a cell tower.
Interference is more likely to be getting into the distribution side of things.
'If' there is any interference being picked up by the dish/LNB, those inline amps will be amplifying it as well.... again, ditch those amps, regardless.
DVB-S2 is certainly more fickle that DVB-S... all the more reason to capture more signal at the dish to begin with.
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