I have located 2 GNU Radio projects on the cgran project page[1][2]
The files seem to be configured for the USRP2 device however I have an N210. I have tried changing to source information on the scripts to use the UHD source however im getting a whole host of type missmatch errors.
Firstly are there any UHD rfid projects, or are there any decent tutorials on converting projects to use the UHD driver or even converting a .py to a .grc file.