I ran a test for the LAA on ADS-B out using a Trig mode s and an uncertified GPS. We used a PowerFlarm to detect this on another aircraft. I had to get permission for the CAA to run the test and it had to follow strict guidelines. The ADS-B test was a big success. I understand the rules on ADS-B may be relaxed very soon thanks to pressure form a number of organisations. If the changes come in and you have a Mode S transponder that supports ES (almost no Garmin units in the UK will do this but just about everything else will) then on a permit machine you will be able to connect the RS232 cable and “go”! It will be more complex and expensive on C of A as you will have to get an avionic engineer to do the work and probably will still have to pay a mod fee.
Rod1