[Elecraft] [Elecraft_K3] TX CW discrepancy

[Vic K2VCO]

Igor Sokolov wrote:
> 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.

What is CONFIG: TX DLY set to? I have noticed that setting it higher than about 10 or 12 
causes CW element shortening. This is the number of ms delay from the time the KEY OUT 
jack goes low and RF is generated. A true QSK amp should be able to work with the default 
setting of 8.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco