After LOTS of trials it has been impossible to get RTK fix more than 15 seconds.
I have tried long baselines at first (RTKView indicated 32 kma baseline which is strange because I am using VRS solution and baseline should be shorter to my knowledge, it basically took an antenna that is at that distance). Under such scenario only a couple of times and a couple of seconds of RTK FIX. The rest mostly float and some DGPS.
Then moved to an open sky environment at 6kms baseline. Tested all possible solutions (VRS3, VRS2, CERCANA, lots of what out CORS national system offers). I have tried to reflash my unit to select Baidou (it worked the same, although there were less satellites than with GPS+GLONASS).
I am getting 13-15 satellites all the time with no luck. Tried all configuration parameters (1-10Hz) with a perfect 4g connection for corrections.
No more things to test. I am afraid I will have to surrender about the possibility of using Alpha as a GIS platform. It just does not work. Nothing like the videos shown on this page, perhaps because the system runs better for Baidou, not the case in Spain where I live (and it seems I am not the only one here in my location as have been contacted about this).
It is a pity, hope something can be done about this. I was really hopeful I could find an affordable solution for GIS Operation.