Openspot designed to always connected to reflector so you don't need to disconnect from reflector before connect to another one.I don't have TH-D74 radio only 5100 and 51 handheld and it's easy to change reflector via radio. Just setup REF030C reflector in your radio and push the PTT. Openspot will disconnect from REF012A and connect to REF030C. Here is my radio setup see my attachment.