SDS firmware updates
Uniden recently provided a couple firmware updates for the SDS scanners. One of stated improvements was better reception of digital voice modes. Uniden didn't really clarify that statement, but on forums its believed to improved low signal performance.
I can confirm that for me, at a particular spot, on my particular SDS with my antenna hub antenna arrangement for UHF. I saw marked improvement on low signal DMR traffic. I was always able to receive it previously, however it took a while for the SDS to lock on. Coming back to that signal, I could tell the SDS locked on to the signal faster and this time started receiving a second site the organization has that is certainly obscured by terrain, when prior I could never receive it.
So, for me, the SDS firmware is a marked improvement when listening to low signal DMR.
On the topic of the SDS and weak signals, came across this video. https://www.youtube.com/watch?v=Z5bLbDeudIE While I don't have an R8600( I dream of one ) I was impressed with the comparison, and was impressed with the SDS200 performance on such a signal.