QRP Labs QDX firmware `v1_04`

QRP Labs · Released Jul 20, 2022 · First seen Sep 7, 2026

v1_04 is not the latest firmware for the QRP Labs QDX: the current version is v1_10 (July 19, 2023). Go to v1_10

In short — summary by updatemystuff.com

Fixed RF discontinuities during transmit, plus per-band gain control and Band Configuration screen.

Written from QRP Labs's release notes, which are printed in full below.

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Resolution to the Rev3 PCB "popping" issue (RF discontinuities during TX).
Audio streamed to the PC during Transmit is now set to zero (silence).
50 millisecond transmit timeout on cessation of audio from PC (protects QDX e.g. if PC crashes).
No CAT command TX timeout (configurable enable and timeout duration).
Removed unnecessary 48ksps clock domain sync PC vs QDX.
Enables PTT output connector, with grounded and +5V outputs individually controllable by band.
12kHz IF offset is removed when you enable IQ Mode.
Transmit is disabled when you are in IQ mode.
Gain is now in dB.
Gain is now configurable per band.
New "Band Configuration" screen where you can configure the list of supported bands.

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