[CQ-Contest] calculating CW duty cycle

[Hans Brakob]

I would be inclined to half Paul’s number, because you need to listen also.

73, de Hans, KØHB
“Just a Boy and his Radio”™
________________________________
From: CQ-Contest <cq-contest-bounces+kzerohb=gmail.com at contesting.com> on behalf of Paul O'Kane <pokane at ei5di.com>
Sent: Monday, July 4, 2022 8:19 AM
To: cq-contest at contesting.com <cq-contest at contesting.com>
Subject: Re: [CQ-Contest] calculating CW duty cycle

On 04/07/2022 05:24, AB2E Darrell wrote:
> Hello all,
> Can anyone tell me the approximate duty cycle for 30-35wpm CW in a contest?
>
The duty cycle for CW does not vary with speed.

The standard word PARIS for assessing speed has 50 units, of which 22
are key down.  Therefore, the duty cycle is 44% for an average of 5
characters per word.

Because some loggers reduce inter-word spacing from 7 to 6 units, the
duty cycle becomes 22 in 49, which is approximately 45%.

These are worst-case duty-cycle values for contesters, because exchange
elements (words) are generally shorter than 5 characters.  Callsigns
with 6 or more characters will tend to increase duty cycles, but
probably never more than 50%.

73,
Paul EI5DI




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