Building a uSDX+ all in one cable (AIOC) using the K1-Connect open hardware board from NA6D

I added a 3rd 3.5mm jack to the open hardware AIOC sold by NA6D to send the serial data to the CAT port on my uSDX+ SDR radio. You can read about the process here: https://www.summet.com/blog/2026/03/09/creating-a-usdx-all-in-one-cable-aioc-using-the-k1-connect-open-hardware-board-from-na6d/ The stock AIOC works fine for Audio In/Out and Push To Talk (via DTR line on the serial port). So you can use it for FT8 or other digital modes on the uSDX+ radio (or anything else that uses a Kenwood style 2.5mm & 3.5mm dual jack). However, without CAT control, you have to manually set the frequency (which isn't difficult, but on the uSDX+ with the minimal UI elements, it's also not easy).