Channel 4 HD is pixellated. And only this channel thru sky network.

[PETER-HILL13]

So, Channel 4HD is really bad due to pixellation. Watching thru Sky Q box.Can't fix it  - please help. All other channels are absolutely fine.

[xenon81]

Which BBC or ITV region are you in? This helps to work out which version of Channel 4 you are getting as there are a few different ones (for advertising reasons).

In cases like this it is very often a dish alignment issue and more channels will be affected, just not ones you often watch. 

[PETER-HILL13]

Southwest. Plymouth area. No other channels are affected. 

[xenon81 · Accepted solution]

The South West version of Channel 4 is broadcast on the same frequency as:

109 Alibi HD

110 Gold HD

604 Nickelodeon HD

When you get break-up on Channel 4 check if those channels are affected. If they are you will need an engineer visit to check the dish alignment. 

[PETER-HILL13]

OK. Ta for that.