[Elecraft] K3 Keying

[GW0ETF]

Barry Simpson wrote:
> 
> Has anyone else noticed that there is a substantial difference in the mark
> space ratio of the keying dependent on whether you operate QSK/semi break
> in
> compared with manual transmit, eg push the transmit button on the front
> panel or use a foot switch to enter transmit.
> 
>  
> 73  
> 
> Barry  VK2BJ
> 
> 

Barry,

Character shortening in QSK seems to be common in many radios but is
normally a function of qsk v semi break-in as well as manual ptt. Most good
external keyers offer 'keying compensation' in msecs to offset this; my
FT990 needed as much as 8ms extra on the characters to give a 1:1 dit ratio
in qsk v semi break-in.

Just done a quick 'scope check here using my Microham cw keyer and the
results are 'inconclusive'. In qsk the space is actually slightly less if
measured from the end of the fall to the start of the rise, but slightly
more if the dit is measured across the 'top' ignoring the rise/fall time. I
forgot to check using the internal keyer but this seems pretty good to me.

Having said all that I see that I have configured my Winkeyer with 3ms
'keying compensation' which was done on the basis of it sounding a little
choppy previously.

73,

Stewart Rolfe, GW0ETF (K3 145)
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