[Elecraft] [Elecraft_K3] TX CW discrepancy

[Vic K2VCO]

Igor Sokolov wrote:

>>> 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.

> Hi Vic,
> QSK is not used here. We are using external PTT. Does TX DLY setting 
> affect sending anyway? I think in  at least one case it is 20ms but why 
> should it affect anything in a series of dots sent with PTT permanently 
> enabled?

I'm not near my radio to try it, but try setting it to NOR 08 and see if the problem goes 
away. I know it is intended for QSK, but it does delay the onset of RF so it may shorten 
the keyed elements even if you are using ptt.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco