[Elecraft] [Elecraft_K3] TX CW discrepancy

[WILLIS COOKE]

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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