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CC2530: CC2530 output power difference problem

Part Number: CC2530


dear all:

           In the process of using CC2530 to measure the individual, we find that the transmission power deviation is very large, and the transmitted power is 2-5.5dBm, Cross test, with the output power of the 5DB module and the output power of the 2DB module is interchangeable with the CC2530 chip and found that the board does not affect ,the chip caused by the difference in output power, 

         The problem is: CC2530 chip data sheet describes the typical output power is 4.5DB, why is there such a result?