QRP Labs QMX
firmware v1_04_000
QRP Labs · Released May 8, 2026 · First seen Sep 7, 2026
Source:
qrp-labs.com
v1_04_000 is not the latest firmware for the QRP Labs QMX: the current version is v1_04_015 (September 24, 2026). Go to v1_04_015
What's in this update
Beta firmware version: Use only on QMX+ it does not work on QMX Documentation is pending. Details are in the QRP Labs groups.io forum here .
- Added AM mode experimentally, currently receive only, with 150-3200 Hz filter
- Virtual U3S: complete Ultimate3S in a QMX - see separate manual
- LCD/buttons UI now supports editing grid screens such as Band Configuration
- Glitchy supply protection saves SMPS modules
- Fullscreen CW practice decode modes (line and character scroll)
- System config menu "Modes enabled" setting lets you choose what modes to enable for the radio
- Optional setting "SWR warn style" allows inverted 's' or flashing inverted 's'
- Flashing normal/inverted 'E' error on Digi mode when no audio or insufficient audio
- SSB config menu re-arrangement: all mic items in microphone sub-menu, likewise for USB audio
- SSB new menu item "Symmetric phase" improves performance - recommend setting: YES
- SSB transmit polar modulation CPU speed improvement
- New parameter "PTT from DTR" lets Virtual COM port DTR operate USB audio SSB transmit PTT
- CAT configuration items moved to a submenu
- CAT new configuration menu item "CAT MM effect" to control whether updates are on demand or immediate
- CAT new command MU forces a complete config menu reload
- CAT new command KD for get/set key-down state
- CAT mew commands TR and RR to set/get Tune Rate and RIT Rate respectively.
- CAT new command PS for power supply status; read returns 1, and PS0; shuts down
- CAT new command AI for Auto Info (modes Old, Extended, Both)
- CAT MD8; command puts QMX into SWR Tune mode (MD0; exits)
- Bug fix: Semi-QSK mode, TX signal high during key-up, caused high current in 2 of 4 transistors
- Bug fix: Adjusting volume while in config menu messed up the screen a lot
- Bug fix: When RIT was enabled, Volume change timeout moved focus to main tuning
- Bug fix: Pressing volume button at the same time as rotating it could cause buttons to lock up
- Bug fix: When RIT was enabled, long press menu button did not enter menu
- Bug fix: CW Keyer key from DTR only worked for USB port 1
- Bug fix: Triple click to toggle backlight persists until power cycle or menu change
- Bug fix: CAT command PC only returned two digits when power >= 10W; now returns 3 digits then
- Bug fix: CAT MM commands stripping floating point decimal point when thousands delimiter is .
- Bug fix: CAT MM CW Bandwidth and center commands had to be issued twice to take effect!
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