[Elecraft] K3: New/ Old QSK

[Paul Christensen]

> Paul, how does this compare with using Semi QSK with .01 delay.  It sounds
> very similar to me--by ear--but I do not have the equipment to look at the
> issues> you've investigated. Thank you, Gary W7TEA

FYI - The New/Old selection also applies to the external key line. 
Regardless of the delay setting, the CW transmit waveform does not change 
between QSK and Semi-QSK.  The Semi-QSK waveform still follows the Old/New 
selction as it does for full QSK.

To my ears, receive recovery time under Semi-QSK at 0.01 is still noticeably 
longer than under full QSK in either New or Old modes.  Also, in QSK, I 
don't detect any receiver recovery time difference between New/Old.

The only difference I've noticed so far is that keyed weighting is lighter 
under New by 4 ms, and at the moment of key closure, the RF envelope time 
starts at about 19ms versus 15 ms under Old.  The 4 ms difference is exactly 
the delta of the RF envelope duration between New and Old modes.  So far, 
I've not heard any anomaly that would cause me to switch from the Old to the 
New mode.

In a nutshell, I much prefer the Old mode and hope it does not go away in a 
future F/W release.

Paul, W9AC