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.<p>SSB in these types of radios--including the QMX-- is generated with the "phase method" <a href="https://electronicspost.com/draw-and-explain-the-block-diagram-of-phase-shift-method-for-generating-ssb-signal/" rel="nofollow">https://electronicspost.com/draw-and-explain-the-block-diagr...</a><p>You can change the phase of the Si5351 chip fast enough over its seral interface to accomplish this.'<p>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.
I have a partially assembled QMX+ sitting on my bench. I need to get it finished.<p>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.
I don't know anything about the product, but just reading the notes, as soon as I read:<p><i>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><p>... I knew I had found some embedded developers. :) Cheers from another STM32 developer. :)