The test at 87.5E Chinasat-12 with lnb Titanium C-138, 5G Red 1, 3.8-4.2GHz band, NF 15° helped me receive this satellite better so that the active transponders could be locked. The most wanted, as a curiosity, was the North Korean channel KC TV, which can be watched at over 5dB.
The most problematic package to receive is the Raj Network package on 4140 V,28800,3/4,8PSK, which can be received at a limit of around 8dB.
The other Polimer TV package on 4020 V has a signal that is easier to lock and stable.
The strongest signal is on 4167 V,1200,5/6, with over 12dB. This could be helpful for those who want to identify the 875E position if they have no other orientation reference. This mux has two IP streams, as does the adjacent mux on 4165 V,2049,3/4.
I watched again the KCTV channel and the images shown, with happy children, reminded me of the Ceausescu years in communist Romania, when the stadiums were full of people and children to pay homage to a paranoid leader. It's the same in North Korea, with "happy" children living in an unhappy/cursed country, embracing the obscene Supreme Leader, exulting in happiness.