Hi,
USB Isoterm Traveller is compact, portable audio interface from Johny G3LIV (
http://www.g3liv.co.uk/).
I've challenged myself to enhance it by adding an opto-CAT while keeping to original case. It was nice adventure and finally a success.
So while this might be "yet-another-CAT-interface", I've accomplished some extra goals, like stable 115200 operation and no requirement for separate +5V line from the radio. My design is for Yaesu FT-8x7, however it can be adapted for other radios.
Being a bit proud of it, I've put up a detailed description with a schematic for any fellow HAM:
http://sp9wpn.cc/optocat/73,
Wojtek SP9WPN


