Don't look now but you can do full duplex autopatch if you modify your rig to operate like the 150MHz VHF mobile phones did.
FYI, whomever wrote what is quoted above is confused, that describes simplex; transmitting and receiving on the same frequency while half duplex is the way a transceiver works into a repeater. That is to say transmitting on one frequency and receiving on another but only one at a time, while the repeater operates in full duplex mode. Oh not for you old buzzards, this is for the newbies in need of elmers.