Are you sure you're giving the R30 the chance of even receiving the signal if not on the same antenna as the SDS200?
The R30 works extremely well on all NXDN signals, NXDN4800 and NXDN9600, Conventional and Trunked (doesn't trunk though), shows Group and Individual calls, works really well on known NXDN encryption codes too if used. Wont show Alias (CallerID).
As above we dont know what you mean by 'code': RAN, encryption key?, UID (It will always have one of these), GID? Post a screenshoot of what your SDS200 is showing once you have checked the antenna question.