Alpha, being a single frequency RTK receiver, is mainly for open sky use. It's not intended to operate in obstructed environment. Yet we just couldn't resist finding out where the limit might be taking Alpha near a wall blocking half of the sky using the UPM-Std RTK Receiver Kit.
RTKLIB's RTKPLOT is used to facilitate viewing of position track result, green dots indicate it is in RTK Fix state, orange dot indicate it is in Float RTK state. It is seen Alpha nicely remained in RTK Fix state near the wall !
Check out how Alpha is normally used with Android phone for RTK surveying in this blog.