Just Reading round the Amsat Uk web site when I came across this:
TNC-Pi Raspberry Pi Packet Radio Board
Which is just what I was looking for, it comes in kit form which should be fun to build, not that my hands or soldering are that good, just as well that there no surface mounted components. Bonus !
Its looks like its going to provide me with a low cost means of using amateur radio AX.25 Packet Radio and APRS.
Aprs is the thing I am most keen on, as well as Microwave and AVT.
Fun times
see http://amsat-uk.org/2013/10/16/tnc-pi-raspberry-pi-packet-radio-board/
