I run a Kenwood tkr-820 here on i r l p, and a similar set up would work
on echo link. It isn't for the beginner or faint of heart. You can buy
these on ebay for $400 or so with duplexers if you keep watching. You do
need to find some one who can reprogram and return the repeater as well as
the duplexers. I can do this as I have both a programmer and a service
monitor. Then you need to interface the repeater to a computer. I'm not
good at building these kinds of cables. It certainly is possible, not not
a simple project.
73s
Butch Bussen
wa0vjr