[Elecraft] Missing first piece of dash or dot when sending CW with K3S USB input with Wintest.

[VA2EW]

Thanks guys for your fast answers and suggestions.

After having read you, I made several tests.

I have observed some very strange things leading me to think that the K3 
USB by itself is not involved:

The problem occurs only when the amplifier (Expert 2K-FA) is in operate 
mode and whatever the output power even 50W in a dummy load (the RF is 
not involved).

The problem disappears when I put 0 ms as well as 30ms in the "CW-PTT ON 
delay" of the interface configuration of Win-test.
That delay is the time between the initial PTT ON signal and the first 
CW sending.
The problem comes back when I put my initial 12ms setting. So why 0 and 
30 are ok and not 12ms...that's the strange thing?

I'm starting to think that there is something related with the inhibit 
output of the amplifier, when there is an inhibit signal at the input of 
the K3, the transmission stops and we cannot hear anymore the 
transmitted CW. So, maybe the USB is correctly doing its job but the 
inhibit signal is hiding it.

You could tell me :" you have found a solution so stop digging" but I do 
not like when things are floating around in the station so I have to put 
an oscilloscope in all that and check the timings.

I'll tell you if I find something interesting for the reflector

73, Gilles VA2EW