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In order to have the White Spaces of the UHF broadcast band (470-790 MHz) in use by unlicensed users, new implementation challenges and special efforts still need to be done. Regulators can significantly impact the feasibility of implementation through requirements on sensing thresholds or by defining emission limits of unlicensed users. This paper addresses the emission limits of unlicensed users according to ECC approach, where the maximum output power is calculated for each location and for each device type/class. The problem of coexistence between white space devices and DTT broadcast service for the operation modes considered in CEPT is discussed and evaluated through simulations. With the obtained results, we discuss the relevancy of parameters stored in the geo-location database.