K3 and KX3 CW WGT

I like the K3's CW WGT to be 1.0 to give me 3:1 Dah:Dit ratio and 1:1 Dit:Space ratio. But when I tried that with the KX# the CW sounded very choppy.
The following measurements were taken by measuring the Dit, Dah and space times with an oscilloscope. The times are in milliseconds and the CW speed for both rigs is 20 WPM.

K3
K3 Wgt 0.9 1 1.05 1.15 1.25
Dit 49 54 56 64 69
Dah 162 166 171 177 183
Space 64 60 55 50 46
Dah/dit 3.3 3.1 3.1 2.8 2.7
Dit/space 0.8 0.9 1.0 1.3 1.5
KX3
KX3 Wgt   1 1.05 1.15 1.25
Dit   50 52 58 64
Dah   165 166 171 178
Space   66 64 59 52
Dah/dit   3.3 3.2 2.9 2.8
Dit/space   0.8 0.8 1.0 1.2

The graph below tells the tale better. We can see that the CW WGT for the K3 should be 1.05 for Dah:Dit=3 and Dit:Space=1. For the KX3, CW WGT should be 1.15 for the same weighting.





A Conclusion:

The term "CW weight" can refer to the ratio of the dit-to-intersymbol-space time or the dah-to-dit ratio. Altering these ratios changes the sound of the keying. A "normal" weight is 1:1, where the time for the dit is the same as the intersymbol time and which gives a “normal” dah-to-dit ratio of 3:1. When the dah-dit ratio is less than 3:1, the dits are emphasized and the keying is said to have a heavier weight.



The CW WGHT control for the KX3 of adjusts these times. For example, if CW WGHT is 1.2, the dit time is increased by 20% and the intersymbol-space time is reduced by 20%. The dah time is increased by the same amount of time (i.e. 20% X dit-time, in effect, increasing the dah-time by 20/3 = 6.67%).








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