Can’t help you there - my spectrum analyzer only goes to 1500 MHz and all the measurements I made with my LimeSDR USB are based on three tuned measurements at each frequency to get the actual value (peak, and not too many varied that much measurement to measurement). There is data that @Karolis has performed on the LimeSDR USB and LimeSDR Mini for those frequencies above 1.2 GHz and they do appear on this forum if you do a search on ‘transmit power’. It also appears here on Myriad:
…and also here if you look at the curve more toward the bottom of the page:
https://wiki.myriadrf.org/LimeSDR_HF_Performance
Hope this helps -
73 de Marty, KN0CK