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LP-CC2651P3: Harmonics with CW at mid-band

Part Number: LP-CC2651P3

On the CC2651 launchpad, I am seeing significant harmonics when generating CW at mid-band (2.44GHz). These harmonics are much lower / not present at 2.48GHz.  Is this expected behavior?

I am including plots at both frequencies. The launchpad is configured for CW at +20dBm using SmartRF Studio 2.27. There is a 10dB attenuator between the launchpad and analyzer.