> Has anyone out there used Echo Link? Do I need any other interface
>beyond the RS232 interface I have in my K2?
What do you want to do with Echolink? It is primarily used in these ways
1) To access a distant repeater or remote base station via the internet
2) To converse with another ham who has Echolink on his computer
3) To connect a repeater or base station to the internet
Echolink does not provide much in the way of control -- it is primarily
relaying voice both ways via the internet. It also has a touchtone decoder.
To interface Echolink to a a radio you need audio going both ways between
the radio and sound card and a method of knowing when to transmit.
Echolink has built-in VOX, but it can also take an electrical connection from
the receiver that indicates the presence of signal and/or squelch.