chinese uSDR/X is way too expensive (Production cost less than 40 Bucks !) and not well made, There are a lot of technical problems with those radios.
Change of License of the uSDX Sandwich, and Release of the final Version
Links to the measurements and discoveries of the issues (sources and proof for my claims)
https://groups.io/g/ucx/topic/85695105?p=Created%2C%2C%2C20%2C1%2C0%2C0%3A%3Arecentpostdate%2Fsticky%2C%2C%2C20%2C2%2C0%2C85695105%2Cprevid%3D1633804797063178850%2Cnextid%3D1632974874717780944
https://groups.io/g/ucx/topic/internal_12v_dc_bus/86158122?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,0,86158122,previd=1633804797063178850,nextid=1632974874717780944&previd=1633804797063178850&nextid=1632974874717780944
https://groups.io/g/ucx/topic/firmware_error_messages/85663258?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,0,85663258,previd=1633804797063178850,nextid=1632974874717780944&previd=1633804797063178850&nextid=1632974874717780944
Link to the Sandwich Files
https://dl2man.de/
Link to the housing files
https://www.prusaprinters.org/prints/74990-usdx-sandwich-housing-lunchbox-by-dl2man