where to find details and capabilities of wspr?

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Anonymous (not verified)
where to find details and capabilities of wspr?

I am new to WSPR. so new in fact that this is day one of looking at wspr and I have no equipment or knowledge of any kind. Can anyone point me to a source of data on what exactly wspr is and what its capabilities are? what type of data can be transmited, how small can radios be, what kind of reliable non-line-of-sight distance can one acheive?

thanks in advance for any help.