Basic WSPR format question

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Basic WSPR format question

I've only just heard about WSPR from an article in the British radio society's magazine RadCom, so apologies for a really basic question. I have been trying to find details of the WSPR signal format, but have so far failed. Things like why the seemingly strange bit-rate; about the convolution coding (and decoding); and the chosen synchronisation bit pattern. Is there a document somewhere that describes all this please?