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QRP Labs QMX SSB beta firmware relased

by DrAwdeOccarim on 3/18/25, 10:40 AM with 24 comments

• by fortran77 on 3/21/25, 9:55 AM

  These new little software based radios are amazing! I'm traveling in the UK now now with a truSDX -- I've run it from all sorts of places with a wire hanging out hotel windows.

  SSB in these types of radios--including the QMX-- is generated with the "phase method" https://electronicspost.com/draw-and-explain-the-block-diagr...

  You can change the phase of the Si5351 chip fast enough over its seral interface to accomplish this.'

  I've been an Extra since 1977, and I've never seen a better time to be a radio hobbiest! So many things are possible today. I still run mostly CW, copying in my head, but I enjoy the digital modes when doing "hotel room" operations with makeshift antennas.

• by geocrasher on 3/21/25, 5:21 AM

  I have a partially assembled QMX+ sitting on my bench. I need to get it finished.

  I'll let somebody else talk about why this firmware update is somewhat earth shattering for the ham radio community and why the QMX itself is a huge deal. We're talking a $1K SDR for $150, multiband up to 6M, fully digital.

• by ra on 3/21/25, 9:29 AM

  I built a QDX - great little radio.

• by bobowzki on 3/21/25, 9:12 AM

  Very nice to see this on the front page!

• by mtreis86 on 3/21/25, 3:55 PM

  Would it be capable of Winlink now? If not what would that take?

• by unwind on 3/21/25, 8:27 AM

  I don't know anything about the product, but just reading the notes, as soon as I read:

  With ALL features enabled (CESSB, compression, mic AGC, Transmit equalization, noise gate, phase and amplitude pre-distortion, you name it), the CPU utilization is approximately 93%. So in other words there is no problem enabling everything.

  ... I knew I had found some embedded developers. :) Cheers from another STM32 developer. :)