HI Fabio,
First of all thanks for write here.
About your question Im happy to reply to you.
1- Water PH is very important in that process, for obtain NH3 you need PH <7.
2- You don't need arcs, plasma or some energy lost in heat for ionize nitrogen.. in that thread initially I have been write about that.. nitrogen in fact is ionized from the same water gas directly passing trough the same UV field. You need an "connection" from water gas and nitrogen or reaction can't appear.. you can ionize nitrogen in other stage but the time of ionization is very slow , another method is pre-charge nitrogen as Meyer using gas processor.
3- About catalyst .. Surely you know how catalyst work.. that is need for add ions or electrons inside reactions.. brown gas is special water gas and the extra electrons are inside molecule. When molecule split or burn released these, in our case are used for new molecule formation, instead when brown gas burn the extra electrons are used for fuse metals, vaporize metals or weld metal or other material together. Only the extra electrons are responsible for that.
4- About new cell.. In patent of Meyer some informations are wrong, some are reported on other patents for protection but all is written.. I suggest you to download meyer memo pdf file and watch the diagrams inside. Surely your eyes will notice the differences and your mind will analyze it in real time.
5- If you use RF you must use salt yes.. only 1% inside that but why you want complicate your life?
I suggest you follow the road to produce brown gas in quantities reading and looking at the diagrams carefully meyermemo pdf file within the page 84
Other suggestion.. the liquid water that you put inside cell must be pre-charged first , remember pre-charged as Meyer suggest not pre-ionized
Regards
Alessandro