[Elecraft] [Elecraft_K3] TX CW discrepancy

[Igor Sokolov]

We did that Willis. With 3 of the K3s it was easy to send on one and listen on the other. Still the best friend was the instrument that clearly revealed the problem. Here is the picture again.... http://forum.qrz.ru/attachment.php?attachmentid=29596&d=1264954098
Please have a look and tell me what  you think.

73, Igor UA9CDC

  ----- Original Message ----- 
  From: WILLIS COOKE 
  To: Igor Sokolov ; Elecraft at mailman.qth.net 
  Cc: Elecraft at mailman.qth.net 
  Sent: Monday, February 01, 2010 1:20 AM
  Subject: Re: [Elecraft] [Elecraft_K3] TX CW discrepancy


  Igor, before I did anything else I would have a good friend whose judgment you trust listen to the Morse you generate with a critical ear and give you an honest opinion.  Preferably someone who can hear you quite well and on a clear band.  Contest comments can be accurate with the best of good will and they can be made with malice by someone who does not wish you well.
   
  Willis 'Cookie' Cooke 
  K5EWJ 





------------------------------------------------------------------------------
  From: Igor Sokolov <ua9cdc at gmail.com>
  To: Elecraft at mailman.qth.net
  Cc: Elecraft at mailman.qth.net
  Sent: Sun, January 31, 2010 8:49:22 AM
  Subject: [Elecraft] [Elecraft_K3] TX CW discrepancy

  It has started with complains of some of our contacts in the contest. They 
  told us that the weighting of out TX CW is not standard.
  Two channel oscilloscope was brought into shack and 3 K3 tcvrs were checked:
  SN 1651 SW ver 3.06
  SN 2929  SW ver 3.68
  SN 3553  SW ver. 3.41
  On all 3 units series of dots were sent using external keyer with 50% 
  weight. While on the monitor output the weight remained to be 50% the RF 
  output showed shortening of dots (and therefore lengthening of spaces) by 7 
  or 8 msec. This effect does not depend on WPM speed and therefore less 
  pronounced at slower speeds.
  Could somebody confirm this please. We do not want to trouble Elecraft 
  without being 100% sure that the problem exists.

  73, Igor UA9CDC 

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