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: <[EMAIL PROTECTED]> >To: <[email protected]> >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 <[EMAIL PROTECTED]> 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 >> >> _______________________________________________ >> Elecraft mailing list >> Post to: [email protected] >> You must be a subscriber to post to the list. >> Subscriber Info (Addr. Change, sub, unsub etc.): >> http://mailman.qth.net/mailman/listinfo/elecraft >> >> Help: http://mailman.qth.net/subscribers.htm >> Elecraft web page: http://www.elecraft.com >> > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
