I’ve changed the title and content of the original post, which was about my LimeSDR mini not receiving below 31mhz when the temperature of the LimeSDR mini as measured on Lime Suite was above 45C.
After more experimentation, it appears that the temperature readout of LimeSuite doesn’t really make sense to me. At a measured temperature of 45C in LimeSuite, a FLIR infrared camera measuring the temperature of the FT601 and Altera FPGA chips puts the surface temperature of the IC’s at approximately 158 F (70C). I have a heatsink over the can on the LMS7002M, so I can’t really accurately measure the LMS7002M surface temp.
Therefore, I can only imagine that when my LimeSDR mini was having low-freq receive issues, the board temp was well over 70C.
So maybe I need to ask a better question - which ICs need to be cooled on the limesdr mini, and what is the recommended surface temp?