By your comments I am wondering if you have a problem with your installation.
Satellite signals do fluctuate from 0 to 100% depending on the atmosphere but you should get 80% or higher most of the time.
From the few times I have bothered to check, it shows a variance most times of about 10% or even less, again depending on the current weather conditions.
As the signal is Digital the same as Terrestrial TV is now,it only has 2 options, Clear or none.
Years ago on a satellite channel, they had the worst grainiest picture I have ever seen but that was to do with their equipment at the studio end and no amount of Fine Tuning the dish or using a 'better STB' was going to make it better.
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