Has support for using the LimeMini on HF improved yet?

The heat issue from my experimentation is not “thermal noise”. If it was thermal noise, then the SNR would decrease linearly with board temp. YT7PWR has a good explanation related the LO.

My suggestion is that if you need HF operation, to either cool the limesdr mini passively or actively, or buy another product which is designed specifically to receive HF.