UPD: 90% of pops affects rx input, PL tone from uplink sounds as if it was DPL.
In some cases DSP functionality of USBradio is too much useful. Previous time i made repeater, it was D945GCLF2D board + Xipar + GM300 RX + Nucleus transmitter, it was pretty nice to generate PL by DSP. And by the way i had no pops on Xipar.
In my current project Debian distro is prefferd, just to be able to easily install lots of additional ham radio packages not supported by centos repos.
I hate DMR’s poor half rate audio too, but unfortunately cheap chineese radios and flexibility made it popular with lots of nodes and activities as a result, so i would like to be able to dial in there from my app_rpt nodes. Actually P25 is supported too but unfortunately much less nodes and activity there.
Transcodiing from IAXrpt to DMR is awesome, transcoding from analog node initially affected by poor voice spectrum (would be nice to be able to expand it with some kind of neural algorithm before transcoding), finally degrades by pops which are, for some reason much more noticeble to AMBE vocoder than to ear.