WSPR message format

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G4ILO
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WSPR message format

I am working on my own implementation of WSPR. At the moment this is more of an exercise in learning about how to write software for digital modes than anything else.

It was quite easy to write a program to create a WAV file from the list of symbol codes and frequencies output by WSPR.EXE, and it decodes it fine.

Is there any documentation explaining how the 162 symbols are arrived at? The program source code being written in FORTRAN is not very easy to understand, and the message seems to go through a number of transformations for reasons that are not clear. Although I did train in FORTRAN when I started employment as a computer programmer nearly 40 years ago I have forgotten most of it, and it seems to have changed a bit from how I remember it anyway.