The PARIS Timing of Morse.

[David J. J. Ring, Jr.]

The PARIS system of #MorseCode timing: https://www.qsl.net/yo3fca/hstc.htm #hamr #hamradio #cw

73

DR

[Dave Ellis]

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. <n1...@arrl.net> wrote:

The PARIS system of #MorseCode timing: https://www.qsl.net/yo3fca/hstc.htm #hamr #hamradio #cw

<2.png>

73

DR

--
OUR FACEBOOK PAGE:
https://www.facebook.com/groups/707451009311335/
 
THIS IS THE "RADIO OFFICERS, &C" MAIL LIST - SUBSCRIBE, UNSUBSCRIBE AND OTHER SETTINGS ARE BELOW.
 
--
Have your R/O friends join the group by visiting https://groups.google.com/forum/#!forum/radio-officers and requesting membership. We'd love to have them.
 
--
 
To contact list owner or managers:
https://groups.google.com/forum/#!contactowner/radio-officers
 
--
---
You received this message because you are subscribed to the Google Groups "Radio Officers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to radio-officer...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/radio-officers/c1d5c989-20c7-6b4c-316c-040d4c475131%40ARRL.NET.