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CC2530: Center frequency variation 2.4 GHz

Part Number: CC2530

Seek information/help with our center frequency variation. We implemented the Inverted F antenna for 2.4 GHz using SWRU120D as a reference design guide. Through our measurements, we found that our center frequency is off centered. We seek some guidance from Texas Instruments as to why our center frequency would be off centered. What components would cause this?