[werk_ag]

Sorry to have caused that. I should have swapped out the TX board earlier in the troubleshooting process, but because the wind/rain "worked", and me not being familiar enough with it, I assumed the TX board was ok.

You don't need to say sorry, nothing is your fault, and you haven't done anything wrong, much by the contrary, if something is wrong, its all my fault. I shouldn't never had make publicly available a system add on, like the Solar/UV interface (situation that is already corrected - Any add-on boards are only available for long time users, no exceptions).

By the way, likely there is nothing wrong with the TX unit you used originally, just the fact that with the change, some wires have may have been placed differently or having now a better contact, may have caused the change on the results. You can't imagine the quantity of problems that sometimes are solved by just changing the type of cable used.
Still regarding to this, at moment I think you are not using anything that is using the ADC1, remove the cable between the Solar/UV and the TX board, it is just acting as an antenna.