Just a reminder to readers that although I specialise in the German tv channels installations all over the Uk, If you also want the Uk freesat channels , it is possible to do it with just one dish.
I do install the Uk FreeSat channels boxes and dishes locally – in the Rotherham, Barnsley, Sheffield and Doncaster Areas
Why not combine your German tv channels installation with the Uk FreeSat channels, avoiding having 2 dishes on the wall?
German from Astra 1 at 19.2 degrees and the Uk freesat from Astra 2 at 28.2 degrees are only 9 degrees apart, so a 80cm dish is absolutely fine to pick up both satellites, especially as both are really strong signals in the Uk and most of Europe. Your receiver can be programmed to switch a device on the dish, which will choose which LNB to route the signals from, Astra1 or Astra2. You can read more about these devices here
It is essential to use a good lnb type for any dish with multiple LNBs , poorly performing models or ones which don’t adhere to the standards can stop the diseqc control signals working, I have often found that the cheaper types from even a manufacturer with good top flight LNBs can cause this problem. Over the last 10 years, I have found which LNB models work and which can cause the system to fail.