[Elecraft] K3 CW speed request

[drewko1 at verizon.net]

Dahs are actually twice the length of dits, I think. Or technically,
the dah period is twice the dit period (i.e., a dah sound plus its
space is equal to two dit sounds and their spaces).

I measured the dahs instead of dits because I don't have a keyer; just
pluged my mono straight key plug into the paddle jack and it gives
dahs. 

I measured the period by averaging over five dah periods with the K3
readout set at 22 wpm and 21 wpm, giving periods of  0.207s and
0.219s, as mentioned. I measured the sidetone at the headphone jack
using audio waveform software.

73,
Drew
AF2Z



On Thu, 03 Jul 2008 07:39:55 -0700, andy, ae6y wrote:

>Those dashes sound a little long.  The formula normally used to calculate 
>lengths of  elements is
>dot length (msec) equals 1200 divided by wpm.
>  Thus, at 22 wpm, the dot length should be 54.5 msec.  Dashes are normally 
>three times as long, i.e., 163.5 msec.
>  73, andy, ae6y
>----- Original Message ----- 
>From: <drewko1 at verizon.net>
>To: <Elecraft at mailman.qth.net>
>Sent: Thursday, July 03, 2008 6:58 AM
>Subject: Re: [Elecraft] K3 CW speed request
>
>
>> On Thu, 03 Jul 2008 13:53:14 +0100, David G4DMP/G3KEP wrote:
>>
>>>In a recent message, charles <m0bin at m0bin.demon.co.uk> wrote ...
>>>>Is it possible to have a speed step of .5 in between the present CW speed
>>>>settings of whole numbers?
>>>>
>>>>I am particularly looking for a CW speed of 21.5 wpm just now.
>>>
>>>Charles, I doubt that the tolerance of the K3 displayed speed is better
>>>than +/- 0.5wpm, so you may find that 21 or 22wpm could be just the
>>>speed you are looking for.  Have you measured it accurately?  Your
>>>findings would be of interest here.
>>>
>>>73
>>
>>
>> I measured the sidetone dah lengths at the speaker:
>>
>> A 22wpm dah is 0.207 sec; a 21wpm dah is 0.219 sec. Not sure about the
>> conversion to wpm but I think this comes out to 24 wpm and 22.8 wpm
>> respectively; could be wrong.
>>
>> 73,
>> Drew
>> AF2Z
>>
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>