Ssdr TX-Delay Video

It's more serious than shown on the video.  See photos below.  When the 6700 Tx Delay is set to the default 0 ms and CW Delay is 0 for full QSK, we now get the first waveform that shows hot-switching of the trailing edge.  This may be in the RF or DSP domain, but it's still a hot-switch timing error. 

The second image shows CW delay at 17 ms and TX Delay staying the same at 0.  It did not look like this in prior SSDR releases.

 

Next, for those thinking we need to have TX Delay higher than 0 ms, I set it to 15ms.  The keyed waveform is delayed by the proper amount of 15ms, but now "dit shortening" occurs and the trailing edge of the waveform is still cut. 

The problem is not so much the dit shortening as that is discussed in the manual when Tx Delay is used.  The main problem is the truncated trailing edge that is causing severe key clicks.

Paul, W9AC 

Theoff. 

Excellent, Paul.  
I was getting ready to request that someone with a scope could make those exact tests!  
Thanks.
Can you run an additional few to document the changes made if TX Delay and CW Delay are both altered, as Al is suggesting?  What are the timing break-points.
FOr now, I have been calling it a "timing inversion" where the cut-off time is not compensated with the TX Delay adjustment, especially if the CW Delay is shorter than the TX Delay.

Thanks again,

Ken - NM9P

Ken,

I tried to, but there are too many moving pieces between CW Speed, TX Delay, and CW Delay.  Also keep in mind there are three CW waveform "break points" that occur at 5-19 WPM, 20-29 WPM, and 30+ WPM.  The Delays affect these break points differently.

The matrix just gets too big for the limited time I have. 

Paul, W9AC

Wonderful! Thanks.

I'm not Steve, but I've taken many measurements.   For now, I would ensure that CW Delay is set to 15 ms. to avoid key clicks and "hot switch" effects with SSDR V1.3. 

Paul, W9AC