[CW] [Radio Officers, &c] The PARIS Timing of Morse.

[Ulrich Steinberg]

The S =2.4d formula works if you assume the standard ratio between
dits and dahs, dit=2 time elements, dah=4 time elements, and the
standard character and word spaces. However, many operators,
especially at higher speeds, tend to shorten the dits and extend the
dahs and the spaces.  In this case your formula would result in an
exaggerated speed.  Therefore, a word with a mix of dits and dahs and
spaces, like PARIS, gives a more realistic result.

73, Ulrich, N2DE


On 3/22/23, Dave Ellis <n1ea at arrl.net> wrote:
> David,
>
> Thanks for the neat sketch on the PARIS method of measuring CW speed.  Some
> years ago I published an article which demonstrated how to use PARIS to
> measure CW speed directly from the paddle just be sending a short burst of
> dots.  Here’s an extract from it:
>
> A New Morse Speed Formula
>
> We can use the Paris standard to develop a new formula for reading Morse
> Speed.  Although it’s very simple, I believe this is original to myself, as
> I’ve never seen it in print anywhere.
>
> Assume you send the word PARIS 12 times in one minute at a constant speed.
> Then you send 12 x 50 = 600 time elements in one minute.  This equates to
> 600/60 = ten elements in 1 second.
>
> Now 10 elements in one second is the equivalent of 5 dots per second (with
> their inter-element spaces), or a dot frequency of 5 Hz.  So 12 words per
> minute, or wpm, equates to a 5 Hz dot frequency, and 2.4 wpm equates to a 1
> Hz dot frequency.  You can now see that morse speed in wpm = 2.4 x dot
> frequency.  This leads to the all-important formula:
>
> S = 2.4d, where S = speed in wpm (words per minute) and d = dot frequency in
> Hz.
>
> This is all that is needed to design a CW Speedo; if you can measure dot
> speed, you can calculate speed in wpm (assuming the rest of the elements are
> correctly formed).
>
> It works best with a paddle, and can work with a bug key (which I never
> tried), but needs a steady hand to measure using a pump key.
>
> The frequencies involved are very low, the range 1 wpm to 50 wpm producing a
> dot frequency of 0.4 Hz to 21.8 Hz.  Once the frequency is measured, the
> formula has to be applied.  To overcome this rather clumsy method, I
> designed a circuit which gave a reading directly in wpm on a moving coil
> meter calibrated either 0-30 or 0-50 wpm as required.  The paddle key is
> simply plugged into the circuit.  Details available from me on request.
>
> Best regards and 73s,
>
> Dave
> G4AJY.
>
>
>
>> On 22 Mar 2023, at 03:54, David J. J. Ring, Jr. <n1ea at arrl.net> wrote:
>>
>> The PARIS system of #MorseCode timing: https://www.qsl.net/yo3fca/hstc.htm
>> #hamr #hamradio #cw
>>
>> <2.png>
>>
>> 73
>> DR
>>
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