In 2020 all experimental aircraft will be required to update their transponders to meet the new ADS-B out requirement. Many of the commercial available options are very expensive so I thought I would give rolling my own a shot.
Got the boards back from fab, now just need to populate them. The two board cover all the digital logic, now just need the RF stuff, basically the hard part. A couple of careless mistakes on the large board but it should be fine, nothing to worry about at the moment.