Simple QRP projects, 10m, 8m, 6m, 4m, FT8, 160m, WSPR, LF/MF, sub-9kHz, nanowaves and other random stuff, some not related to amateur radio.
9 Mar 2026
uSDX Ultra
This transceiver is now some years old and I assume it is still being made. In the UK it is available from AliExpress for just over £85, which is very low for a QRP handheld covering many of the HF bands. In a tiny handheld form factor is amazing value. It is sold as a 5W radio, but 3-4W is more common.
There have been reports of bad audio unless the settings are adjusted but I have no idea if this has been improved in later models.
On the face of it, it looks a bargain, but I have not used one.
I'd expect the audio quality to be passable at best, due to the uSDX construction stretching the atmega328p at and sometimes beyond it's absolute limits. But it's a remarkably simple and cheap architechture without any high-Q filters.
I'd expect the audio quality to be passable at best, due to the uSDX construction stretching the atmega328p at and sometimes beyond it's absolute limits.
ReplyDeleteBut it's a remarkably simple and cheap architechture without any high-Q filters.