This microphone is configured to be used with the QRP-Labs QMX and QMX+. It will also work with uSDX radios and the Elecraft KX2/3. The required stereo audio cable is not included. Known working radios: QMX: (Tip=PTT, Ring=Mic) KX2/3: (Tip=Mic, Ring = PTT) The fully assembled mics will come with conformal coating on the back…
Month: December 2025
QRP Radio Microphone
This project is to build a microphone that is compatible with my QRP-Labs QMX+. It will also incidentally be compatible with the popular uSDX radios as well as the Elecraft KX2/3. For this microphone to work, the microphone element must be an electret. It also needs a PTT push button. The operating manual of the…