(tr)uSDX is the successor of the uSDX Project. It´s the Result of the Collaboration between PE1NNZ and DL2MAN. The design was intended as an easy to build (pre-assembled) Kit, that can be sourced (in a group buy situation) for abt. 50,-€. 3D Printed Housing not included in this price.

Creative Commons License
Software, Schematics and PCB Layouts are licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.

This means: Even commercial use is allowed as long as you don´t change anything ! No Royalties charged, donations welcome.

If you want to become an “official” commercial Supplier, we ask you to send us 2 (tr)uSDX Kits OR 2 built (tr)uSDX Transceivers free of charge. We will test your hardware, and if it meets the design goals, we will publish a link to your shop as “trusted source”. This is only applying to commercial parties. Non Profit Group buys from Ham to Ham will always be supported ! The above procedure ensures, that future buyers will know where to buy with confidence. We don´t ask for money for that “service”, we will only keep the test samples as reference.


The (tr)uSDX is a 5-Band / Mulitmode QRP Transceiver in Pocket Format (90x60x30mm – 140g). It features a highly efficient Class E PA and Supports CW/LSB/USB and AM/FM. Right now it covers 80/60/40/30/20m and in Future there will be support for 17/15/12/10m as well

It is supplied with an OLED Display, onboard Mic, (tiny) onboard speaker and for improvised QSO onboard PTT Key can be used as emergency CW Key.

Further on, the (tr)uSDX has a (Micro)USB CAT and Programming Interface, and while it produces typically 5W @ 13,8V Power Supply, it can create 0,5W Output from 5V USB Supply alone.

Typically it draws 80mA on RX (with MS5351 – less with Si5351) and 500mA on TX @13,8V and typical 85% PA Efficiency.

It is supplied with OnBoard SWR Bridge and Voltage/Current measurement Hardware, to help in tuning and operation.

Continue on the sub-pages:

1 (tr) uSDX Group Buy – Gerbers & more

2 (tr)uSDX Assembly – Schematics and more

3a (tr)uSDX Bootloader – (Initial Firmware)

3b (tr)uSDX Firmware – (Working Firmware)

4 (tr)uSDX Manual – how to operate it