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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
