There’s a lot of digital modes interface in amatuer world from exprenvies to cheapest one. for aprs, ft8 and anything else. i found a excelent writing about digital interface. here’s one of them:
https://kb9rlw.blogspot.com/2016/08/cheap-and-easy-to-build-digital-modes.html
i designed layout based on schematic from that site. sadly, my digital interface project was postponed.
but hey, i still have blank pcb, and components not to hard to find on my local market.
maybe i’ll continue in future.
