Thanks for this information as well! I am also working on the commentators list, but it will take some time before I finish it. I was only aware of Adriano Cerqueira commentating some of the races for RTP in the 70s, so this is very valuable information for me.
Also, did Janus Lengel ever commentated races for RTP? I know he had few guest appearances on Globo in mid 70s, while his wife was a studio expert in one of the first (if not first) Polish F1 broadcasts - Monaco 77.
Dweller, hopefully you have better sources than my memory but I can confirm Adriano Cerqueira was the commentator from 1974 or 1975 until at least late in the eighties. Before that, Felipe Nogueira as mentioned before. He was replaced once in 72, I believe, by a speedboat expert called Mário Gonzaga Ribeiro - I do remember him because the way he would call foreign names was even worse than Nogueira .
No recollection whatsoever about Janus Lengel.