Looking good - well done!

Have you any thoughts on extending your project to build a vector network analyser? This would be a really useful bit of kit and possibly not too difficult to design / build. I've been researching it a bit - a simple 2 channel system would require 4 directional couplers:

I cant find and decent DIY microwave VNA's on the interweb so this could be a first?

More info:

http://event.on24.com/eventRegistration/console/EventConsoleNG.jsp?uimode=nextgeneration&eventid=1280495&sessionid=1&username=&partnerref=&format=fhaudio&mobile=false&flashsupportedmobiledevice=false&helpcenter=false&key=6157B1F5FE7B64D97B1E9FA339F3E69E&text_language_id=en&playerwidth=1024&playerheight=768&overwritelobby=y&eventuserid=178743029&contenttype=A&mediametricsessionid=143583132&mediametricid=1853033&usercd=178743029&mode=launch#

I though about building a VNA before this. I actually got inspired by Henrik's project (have you checked his blog? that guy's insane!), but after some thought I realized it will be too much to bite and it would be finished. Look at this only, so many things got wrong and I haven't even started - bad soldering here, bad soldering there, deep studying every single chip and checking all possible options before even realizing that it was soldering issue XD!

bad soldering - sounds very familiar . I think I saw henriks blog somewhere. Must find it again now. The vna could be a separate module that works alongside your current board?