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 .

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

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