I want to setup a TCP/IP link between my friends house 7km away from me on 70cm. 

1200 Baud is a bit slow, and we are looking into something with a faster data rate. 

I know normal audio does not work for 9600 baud packet. What are the requirements?

I have a bunch of Motorola Radius SM50 UHF wideband commercial radio's and I am wondering if they would work? They have direct discriminator out on the back.