After reading a number of posts about improving radio noise by cooling your SDR I decided to try the same on a NooElec SmarTee SDR that I use with Linux. I noticed previously that this SDR runs hot but was assured that this was normal ....
So I fire up Gqrx and look at the spectrum display on 137.5 MHz. I then bolt on to the SDR body a pair of heat sinks reclaimed from old PC graphics cards. By chance their mounting holes line up so it really was just a couple of small think bolts with nuts.
Over the next 15 minutes I see improvements in the noise floor but no change to the peaks. So for now the heat sinks stay on. Every little helps - right ?