CW speed clabration
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Does the K2 have an adjustment to correctly set the cw speed? If it does I
can't seem to find it. When I set the CW speed on mine on 20 wpm it actually sends about 25 to 27 wpm. I realize that you can slow this down by more spacing between the letters, but it would be nice if it could be calibrated. I really think it is bad cw when you are creating the letters at 25 wpm and slow it down by excessive spacing. 73 Scott N5SM _________________________________________________________________ http://liveearth.msn.com _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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On Mon, 2 Jul 2007, Scott McDowell wrote:
> Does the K2 have an adjustment to correctly set the cw speed? If it does I > can't seem to > find it. I use the craniometer....it is not part of the K2, but virtually all CW ops have access to one. Sadly, each craniometer has it's own calibration scale. > When I set the CW speed on mine on 20 wpm it actually sends about 25 to 27 > wpm. Hmmmm, perhaps like the old BC221 Frequency Charts...you could develop a chart for handy reference....actually two charts.. Chart 1 K2 Speed Display Actual Speed Chart 2 Actual Speed k2 Speed Display If there is enough interest, I'd be happy to develop and make available a spread sheet so that each K2 could have it's own CW speed calibration document. Thom,EIEIO k3hrn Email, Internet, Electronic Information Officer www.baltimorehon.com/ Home of the Baltimore Lexicon www.tlchost.net/hosting/ Web Hosting as low as 3.49/month _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by N5SM
Scott McDowell wrote:
> Does the K2 > have an adjustment to correctly set the cw speed? If it does I can't It's C22 on the control board, but note that the adjustment range is rather limited and you will not be able to use several of the CAL menu options after you have made the adjustment. (Although the keyer speed control may look like a pot, it's really a shaft encoder.) -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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Fellas:
There is NO(!) means of significantly re-calibrating the keyer speed... and it should not be off by nearly THAT much. The Keyer speed control IS a POT... the ONLY encoder is the VFO knob. C22 is the master oscillator calibration capacitor which sets the calibration for the entire K2. If you adjust C22, you will HAVE to re-run CAL PLL, and then you will probably want to re-run CAL FIL for each of your XTAL filter settings. REGARDLESS if the setting of C22, it will NOT significantly effect the speed calibration of the internal keyer. Adjust C22 only if the frequency calibration of the K2 is not to your satisfaction. I can provide documentation for an improved calibration routine... available on the Elecraft web site, but I don't recall precisely where it is located. 73, Tom Hammond N0SS At 15:27 07/03/2007, David Woolley wrote: >Scott McDowell wrote: >>Does the K2 have an adjustment to correctly set the cw speed? If it >>does I can't > >It's C22 on the control board, but note that the adjustment range is >rather limited and you will not be able to use several of the CAL >menu options after you have made the adjustment. > >(Although the keyer speed control may look like a pot, it's really a >shaft encoder.) > >-- >David Woolley >Emails are not formal business letters, whatever businesses may want. >RFC1855 says there should be an address here, but, in a world of spam, >that is no longer good advice, as archive address hiding may not work. >_______________________________________________ >Elecraft mailing list >Post to: [hidden email] >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: [hidden email] 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 |
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Tom Hammond wrote:
> Fellas: > > There is NO(!) means of significantly re-calibrating the keyer speed... I did say the adjustment range would be rather limited! > and it should not be off by nearly THAT much. Sorry, I couldn't resist giving a literal reply. Yes, the keyer speed is crystal controlled by the 4MHz clock crystal (which cannot be significantly in error without an obvious failure of the VFO calibration). If the speed is wrong, it is one of: - a hardware fault in the microcontroller; - a bug in coding the timer handling; - a difference in the definition of speed between the firmware coder and the user. > > The Keyer speed control IS a POT... the ONLY encoder is the VFO knob. Physically its a pot, but its function in the K2 is as a shaft encoder. The microcontroller reads the position of the pot as, as a number, and uses that number to decide how fast to send the morse. It is not being used to control the R part of an RC time constant as might be the case in a non-software implementation of a keyer. I'd therefore say it was a poor man's encoder, rather than a pot, in reality. > > C22 is the master oscillator calibration capacitor which sets the > calibration for the entire K2. If you adjust C22, you will HAVE to > re-run CAL PLL, and then you will probably want to re-run CAL FIL for > each of your XTAL filter settings. If you were to to modify C22 to change the morse speed calibration, which would be pretty pointless, as the adjustment range is probably only about 100 parts per million, you *MUST NOT* re-run CAL PLL or CAL FLTR. Both of these assume that C22 has been set to make the frequency exactly 4MHz. (You also should not re-run these at a different temperature from the one at which C22 was last correctly adjusted, if you want maximum accuracy and you have the thermistor board.) In normal operation, the 4MHz oscillator is not used as a frequency reference, for anything except the morse speed. It is used as the primary frequency reference during CAL PLL and CAL FLTR. As the normal reason for adjusting C22 is to make the 4MHz more accurate, the natural consequence of changing is that one would want to recalibrate the PLL master reference oscillator, which is what sets the frequency reference in normal operation, but is trimmed with an electrically, rather than mechanically, variable capacitor. If one compromises its 4MHz accuracy to achieve some other aim, it is no longer a good primary reference for calibration. PS I think the reply about individual calibration charts was also tongue in cheek. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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In reply to this post by N5SM
At 05:08 PM 7/2/2007, Scott McDowell wrote...
>Does the K2 have an adjustment to correctly set the cw speed? If it >does I can't seem to >find it. >When I set the CW speed on mine on 20 wpm it actually sends about 25 >to 27 wpm. >I realize that you can slow this down by more spacing between the >letters, but it would >be nice if it could be calibrated. I really think it is bad cw when >you are creating the >letters at 25 wpm and slow it down by excessive spacing. How are you measuring the speed? When set to 20 WPM, I used a scope and captured two iambic dot-dash sequences to eliminate errors due to weighting or waveshapes. Those 12 dot times took 697.2 ms. That's a dot time of 58.1 ms, or 1033 dot times per minute. Using the common convention, with "PARIS" as the standard word (50 dot times), that works out to 20.7 WPM. Close enough for me. I doubt yours is any different, since the timing is ultimately crystal controlled. Here's some info on calculating Morse speed: http://www.kent-engineers.com/codespeed.htm _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
Re: CW speed clabration
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On Wednesday 04 July 2007 10:27:58 Mike S wrote:
> Here's some info on calculating Morse speed: > http://www.kent-engineers.com/codespeed.htm That page gives the definition as wpm * (dot length in milliseconds) = 1200 although not explicitly. This is the definition in many RSGB publications. Ian, G4ICV, AB2GR, K2 #4962 -- _______________________________________________ Elecraft mailing list Post to: [hidden email] 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 |
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