QRP Labs QDX-M
firmware v1_04
QRP Labs · Released Jul 20, 2022 · First seen Sep 7, 2026
Source:
qrp-labs.com
v1_04 is not the latest firmware for the QRP Labs QDX-M: the current version is v1_10 (July 19, 2023). Go to v1_10
In short — summary by updatemystuff.com
Fixes TX RF popping on Rev3 PCB, mutes transmit audio, and adds per-band gain and PTT control.
- Eliminated RF discontinuities during TX on Rev3 PCB
- Silenced transmit audio to PC with added protection timeouts
- Introduced band configuration screen with per-band gain and PTT control
Written from QRP Labs's release notes, which are printed in full below.
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What's in this update
- 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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