I have a simplex node and it has started the ping pong thing. Did it once before and don’t remember how I resolved it. I am using simpleusb, and assuming it also accepts rxondelay. I have it set to rxondelay=150 already and it makes no difference. This radio has had no changes in three years (Custom MVP)I do not use carrier sq at all. the CG detect goes to the COS in on the controller. I also have it set to duplex=0, but that was so I can get telemetry tell me if it is linked to something. But none of that changed. The only thing to change was when I renamed echolink.conf to echolink.conf.off to drop that thing. That’s the only change. The reason why I don’t think rxondelay isn’t working is because I can “kerchunk” for a brief moment and get a response. But according to what I have read, 150 delay should be 3000 ms. George J Csahanin W2DB 2360 Cedar Park, TX