Hi Jack-
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It's a metric of the reduction of global variables.? Note that the .ino file was also greatly de-cluttered in concert with SDT.h.
There were also a bunch of variables which only existed in the SDT.h file.? I suspect they were remnants of earlier functions, tests, and experiments which were never cleaned up.
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It was a large clean-up job, but the result was worth it.? The code is much easier to work with and debug.? Not really different in effect than that first step you Al took to break the
SDR Convolution code from a single to multiple files.
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73 Greg KF5N
