The uSDX struck me as an extremely clever project that was a proof of concept of the same methods that will go into the QMX SSB...? But I remember at the time the conclusion was that while the uSDX technically worked for SSB, the actual quality of the SSB signal was pretty poor due to limitations of the hardware that was never designed for the processing power needed by the EER method of SSB generation.
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I would wait for the QMX firmware, personally.
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I am sure there are more knowledgeable members around who can correct me on the details...
