This needs to be implemented in sBitx V4,
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Getting back to the SMS 5V regulator noise, I just finished building a QRPlabs QMX+ and while it uses 3 different SMS regs it does not exhibit any noise from them because of this, direct quote from QMX+ info:
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" The rather unique aspect is that the microcontroller knows the radio's operating frequency; it also knows the switching frequency. Both are known relative to the high precision 25MHz TCXO reference which is the master clock for the entire design. The CPU can calculate where the harmonics of the switching frequency occur and slightly alter the buck converter PWM frequency to move the interference far away from the operating frequency."
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We need this in the sBitx V4.
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Joel
N6ALT
Joel Caulkins/N6ALT