I have set up two scanners side by side one set to Thorodin and one set to Simulcast. Thorodin only hits about 10% of the time. I don't know how it works when you have 3 sites, all with the same cc. Each site must measure reception and decide which one will transmit? In my mind, it would seem you would get a lot of strange mixing if the sites all transmitted at the same time, even with digital, if the transmitting timing was off, just a little. Simulcast dosen't confuse my PSR 500, but my PSR 800 dosen't like it and goes digital often, right in the middle of a transmission.