Please refer to this application note:
https://www.nxp.com/docs/en/application-note/AN11902.pdf
It provides the measurement results that have been carried out on the standard 1900MHz BGU8052 evaluation boards at 1.3GHz.
The measured IP3O is 35dBm. This value fits the datasheet spec (IP3O>32dBm) at 1900MH. We do not expect noticeable difference at 1.2GHz.
Have a great day,
Pavel
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