LF: DFCW split

["Mike Dennison" <mike.dennison@ntlworld.com>]

Can anyone tell me whether there is any agreement on the frequency 
difference between the dot and dash when using DFCW? 

Obviously it is different for different dot lengths, but it should be 
possible to recommend an approximate shift to a newcomer, perhaps in 
the form:

magic number divided by the dot length in seconds = Hertz

Mike, G3XDV
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