yes, the pdch limit zone is indeed controlled by the variable (it’s not a parameter) max_spdch_limit.
if you have the docs, then you will be fine, eventually. Just take your time writing your own notes and your own examples.
Your question wasn’t stupid, and if you’re willing to dig into this topic, then you yourself are certainly not stupid ! 🙂 I will try to help.
Even very experienced rf engineers in ALU are getting this part wrong sometimes…