Quite widespread nowadays, the UV-K5 is a fantastic platform for many experimentation. However, fast (aka 9600 baud or flat audio) data was out of reach as the filters and pre/de-emphasis was always on by default, same as many other Chinese radios. So no DMR, NXDN, M17, DSTAR… Or POCSAG!

However, some time ago, Rob Riggs WX9O from Mobilinkd figured out how to modify the radio's registers and hardware filters to get a very flat audio response from this radio.