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Calculating Morse Code Speed

 
The word PARIS is the standard for determing CW code speed. Each dit is one element, each dah is three elements, intra-character spacing is one element, inter-character spacing is three elements and inter-word spacing is seven elements. The word PARIS is exactly 50 elements.
Note that after each dit/dah of the letter P -- one element spacing is used except the last one. (Intra-Character).
After the last dit of P is sent, 3 elements are added (Inter-Character). After the word PARIS - 7 elements are used.
Thus:
P = di da da di = 1 1 3 1 3 1 1 (3) = 14 elements
A = di da = 1 1 3 (3) = 8 elements
R = di da di = 1 1 3 1 1 (3) = 10 elements
I = di di = 1 1 1 (3) = 6 elements
S = di di di = 1 1 1 1 1 [7] = 12 elements
Total = 50 elements
() = intercharacter
[] = interword

If you send PARIS 5 times in a minute (5WPM) you have sent 250 elements (using correct spacing). 250 elements into 60 seconds per minute = 240 milliseconds per element.

13 words-per-minute is one element every 92.31 milliseconds.

The Farnsworth method sends the dits and dahs and intra-character spacing at a higher speed, then increasing the inter-character and inter-word spacing to slow the sending speed down to the overall speed. For example, to send at 5 wpm with 13 wpm characters in Farnsworth method, the dits and intra-character spacing would be 92.3 milliseconds, the dah would be 276.9 milliseconds, the inter-character spacing would be 1.443 seconds and inter-word spacing would be 3.367 seconds.

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